kafka ConfigDef 源码
kafka ConfigDef 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/config/ConfigDef.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.kafka.common.config;
import org.apache.kafka.common.config.types.Password;
import org.apache.kafka.common.utils.Utils;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.function.BiConsumer;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
/**
* This class is used for specifying the set of expected configurations. For each configuration, you can specify
* the name, the type, the default value, the documentation, the group information, the order in the group,
* the width of the configuration value and the name suitable for display in the UI.
*
* You can provide special validation logic used for single configuration validation by overriding {@link Validator}.
*
* Moreover, you can specify the dependents of a configuration. The valid values and visibility of a configuration
* may change according to the values of other configurations. You can override {@link Recommender} to get valid
* values and set visibility of a configuration given the current configuration values.
*
* <p/>
* To use the class:
* <p/>
* <pre>
* ConfigDef defs = new ConfigDef();
*
* defs.define("config_with_default", Type.STRING, "default string value", "Configuration with default value.");
* defs.define("config_with_validator", Type.INT, 42, Range.atLeast(0), "Configuration with user provided validator.");
* defs.define("config_with_dependents", Type.INT, "Configuration with dependents.", "group", 1, "Config With Dependents", Arrays.asList("config_with_default","config_with_validator"));
*
* Map<String, String> props = new HashMap<>();
* props.put("config_with_default", "some value");
* props.put("config_with_dependents", "some other value");
*
* Map<String, Object> configs = defs.parse(props);
* // will return "some value"
* String someConfig = (String) configs.get("config_with_default");
* // will return default value of 42
* int anotherConfig = (Integer) configs.get("config_with_validator");
*
* To validate the full configuration, use:
* List<Config> configs = defs.validate(props);
* The {@link Config} contains updated configuration information given the current configuration values.
* </pre>
* <p/>
* This class can be used standalone or in combination with {@link AbstractConfig} which provides some additional
* functionality for accessing configs.
*/
public class ConfigDef {
private static final Pattern COMMA_WITH_WHITESPACE = Pattern.compile("\\s*,\\s*");
/**
* A unique Java object which represents the lack of a default value.
*/
public static final Object NO_DEFAULT_VALUE = new Object();
private final Map<String, ConfigKey> configKeys;
private final List<String> groups;
private Set<String> configsWithNoParent;
public ConfigDef() {
configKeys = new LinkedHashMap<>();
groups = new LinkedList<>();
configsWithNoParent = null;
}
public ConfigDef(ConfigDef base) {
configKeys = new LinkedHashMap<>(base.configKeys);
groups = new LinkedList<>(base.groups);
// It is not safe to copy this from the parent because we may subsequently add to the set of configs and
// invalidate this
configsWithNoParent = null;
}
/**
* Returns unmodifiable set of properties names defined in this {@linkplain ConfigDef}
*
* @return new unmodifiable {@link Set} instance containing the keys
*/
public Set<String> names() {
return Collections.unmodifiableSet(configKeys.keySet());
}
public Map<String, Object> defaultValues() {
Map<String, Object> defaultValues = new HashMap<>();
for (ConfigKey key : configKeys.values()) {
if (key.defaultValue != NO_DEFAULT_VALUE)
defaultValues.put(key.name, key.defaultValue);
}
return defaultValues;
}
public ConfigDef define(ConfigKey key) {
if (configKeys.containsKey(key.name)) {
throw new ConfigException("Configuration " + key.name + " is defined twice.");
}
if (key.group != null && !groups.contains(key.group)) {
groups.add(key.group);
}
configKeys.put(key.name, key);
return this;
}
/**
* Define a new configuration
* @param name the name of the config parameter
* @param type the type of the config
* @param defaultValue the default value to use if this config isn't present
* @param validator the validator to use in checking the correctness of the config
* @param importance the importance of this config
* @param documentation the documentation string for the config
* @param group the group this config belongs to
* @param orderInGroup the order of this config in the group
* @param width the width of the config
* @param displayName the name suitable for display
* @param dependents the configurations that are dependents of this configuration
* @param recommender the recommender provides valid values given the parent configuration values
* @return This ConfigDef so you can chain calls
*/
public ConfigDef define(String name, Type type, Object defaultValue, Validator validator, Importance importance, String documentation,
String group, int orderInGroup, Width width, String displayName, List<String> dependents, Recommender recommender) {
return define(new ConfigKey(name, type, defaultValue, validator, importance, documentation, group, orderInGroup, width, displayName, dependents, recommender, false));
}
/**
* Define a new configuration with no custom recommender
* @param name the name of the config parameter
* @param type the type of the config
* @param defaultValue the default value to use if this config isn't present
* @param validator the validator to use in checking the correctness of the config
* @param importance the importance of this config
* @param documentation the documentation string for the config
* @param group the group this config belongs to
* @param orderInGroup the order of this config in the group
* @param width the width of the config
* @param displayName the name suitable for display
* @param dependents the configurations that are dependents of this configuration
* @return This ConfigDef so you can chain calls
*/
public ConfigDef define(String name, Type type, Object defaultValue, Validator validator, Importance importance, String documentation,
String group, int orderInGroup, Width width, String displayName, List<String> dependents) {
return define(name, type, defaultValue, validator, importance, documentation, group, orderInGroup, width, displayName, dependents, null);
}
/**
* Define a new configuration with no dependents
* @param name the name of the config parameter
* @param type the type of the config
* @param defaultValue the default value to use if this config isn't present
* @param validator the validator to use in checking the correctness of the config
* @param importance the importance of this config
* @param documentation the documentation string for the config
* @param group the group this config belongs to
* @param orderInGroup the order of this config in the group
* @param width the width of the config
* @param displayName the name suitable for display
* @param recommender the recommender provides valid values given the parent configuration values
* @return This ConfigDef so you can chain calls
*/
public ConfigDef define(String name, Type type, Object defaultValue, Validator validator, Importance importance, String documentation,
String group, int orderInGroup, Width width, String displayName, Recommender recommender) {
return define(name, type, defaultValue, validator, importance, documentation, group, orderInGroup, width, displayName, Collections.emptyList(), recommender);
}
/**
* Define a new configuration with no dependents and no custom recommender
* @param name the name of the config parameter
* @param type the type of the config
* @param defaultValue the default value to use if this config isn't present
* @param validator the validator to use in checking the correctness of the config
* @param importance the importance of this config
* @param documentation the documentation string for the config
* @param group the group this config belongs to
* @param orderInGroup the order of this config in the group
* @param width the width of the config
* @param displayName the name suitable for display
* @return This ConfigDef so you can chain calls
*/
public ConfigDef define(String name, Type type, Object defaultValue, Validator validator, Importance importance, String documentation,
String group, int orderInGroup, Width width, String displayName) {
return define(name, type, defaultValue, validator, importance, documentation, group, orderInGroup, width, displayName, Collections.<String>emptyList());
}
/**
* Define a new configuration with no special validation logic
* @param name the name of the config parameter
* @param type the type of the config
* @param defaultValue the default value to use if this config isn't present
* @param importance the importance of this config
* @param documentation the documentation string for the config
* @param group the group this config belongs to
* @param orderInGroup the order of this config in the group
* @param width the width of the config
* @param displayName the name suitable for display
* @param dependents the configurations that are dependents of this configuration
* @param recommender the recommender provides valid values given the parent configuration values
* @return This ConfigDef so you can chain calls
*/
public ConfigDef define(String name, Type type, Object defaultValue, Importance importance, String documentation,
String group, int orderInGroup, Width width, String displayName, List<String> dependents, Recommender recommender) {
return define(name, type, defaultValue, null, importance, documentation, group, orderInGroup, width, displayName, dependents, recommender);
}
/**
* Define a new configuration with no special validation logic and no custom recommender
* @param name the name of the config parameter
* @param type the type of the config
* @param defaultValue the default value to use if this config isn't present
* @param importance the importance of this config
* @param documentation the documentation string for the config
* @param group the group this config belongs to
* @param orderInGroup the order of this config in the group
* @param width the width of the config
* @param displayName the name suitable for display
* @param dependents the configurations that are dependents of this configuration
* @return This ConfigDef so you can chain calls
*/
public ConfigDef define(String name, Type type, Object defaultValue, Importance importance, String documentation,
String group, int orderInGroup, Width width, String displayName, List<String> dependents) {
return define(name, type, defaultValue, null, importance, documentation, group, orderInGroup, width, displayName, dependents, null);
}
/**
* Define a new configuration with no special validation logic and no custom recommender
* @param name the name of the config parameter
* @param type the type of the config
* @param defaultValue the default value to use if this config isn't present
* @param importance the importance of this config
* @param documentation the documentation string for the config
* @param group the group this config belongs to
* @param orderInGroup the order of this config in the group
* @param width the width of the config
* @param displayName the name suitable for display
* @param recommender the recommender provides valid values given the parent configuration values
* @return This ConfigDef so you can chain calls
*/
public ConfigDef define(String name, Type type, Object defaultValue, Importance importance, String documentation,
String group, int orderInGroup, Width width, String displayName, Recommender recommender) {
return define(name, type, defaultValue, null, importance, documentation, group, orderInGroup, width, displayName, Collections.emptyList(), recommender);
}
/**
* Define a new configuration with no special validation logic, not dependents and no custom recommender
* @param name the name of the config parameter
* @param type the type of the config
* @param defaultValue the default value to use if this config isn't present
* @param importance the importance of this config
* @param documentation the documentation string for the config
* @param group the group this config belongs to
* @param orderInGroup the order of this config in the group
* @param width the width of the config
* @param displayName the name suitable for display
* @return This ConfigDef so you can chain calls
*/
public ConfigDef define(String name, Type type, Object defaultValue, Importance importance, String documentation,
String group, int orderInGroup, Width width, String displayName) {
return define(name, type, defaultValue, null, importance, documentation, group, orderInGroup, width, displayName, Collections.<String>emptyList());
}
/**
* Define a new configuration with no default value and no special validation logic
* @param name the name of the config parameter
* @param type the type of the config
* @param importance the importance of this config
* @param documentation the documentation string for the config
* @param group the group this config belongs to
* @param orderInGroup the order of this config in the group
* @param width the width of the config
* @param displayName the name suitable for display
* @param dependents the configurations that are dependents of this configuration
* @param recommender the recommender provides valid values given the parent configuration value
* @return This ConfigDef so you can chain calls
*/
public ConfigDef define(String name, Type type, Importance importance, String documentation, String group, int orderInGroup,
Width width, String displayName, List<String> dependents, Recommender recommender) {
return define(name, type, NO_DEFAULT_VALUE, null, importance, documentation, group, orderInGroup, width, displayName, dependents, recommender);
}
/**
* Define a new configuration with no default value, no special validation logic and no custom recommender
* @param name the name of the config parameter
* @param type the type of the config
* @param importance the importance of this config
* @param documentation the documentation string for the config
* @param group the group this config belongs to
* @param orderInGroup the order of this config in the group
* @param width the width of the config
* @param displayName the name suitable for display
* @param dependents the configurations that are dependents of this configuration
* @return This ConfigDef so you can chain calls
*/
public ConfigDef define(String name, Type type, Importance importance, String documentation, String group, int orderInGroup,
Width width, String displayName, List<String> dependents) {
return define(name, type, NO_DEFAULT_VALUE, null, importance, documentation, group, orderInGroup, width, displayName, dependents, null);
}
/**
* Define a new configuration with no default value, no special validation logic and no custom recommender
* @param name the name of the config parameter
* @param type the type of the config
* @param importance the importance of this config
* @param documentation the documentation string for the config
* @param group the group this config belongs to
* @param orderInGroup the order of this config in the group
* @param width the width of the config
* @param displayName the name suitable for display
* @param recommender the recommender provides valid values given the parent configuration value
* @return This ConfigDef so you can chain calls
*/
public ConfigDef define(String name, Type type, Importance importance, String documentation, String group, int orderInGroup,
Width width, String displayName, Recommender recommender) {
return define(name, type, NO_DEFAULT_VALUE, null, importance, documentation, group, orderInGroup, width, displayName, Collections.emptyList(), recommender);
}
/**
* Define a new configuration with no default value, no special validation logic, no dependents and no custom recommender
* @param name the name of the config parameter
* @param type the type of the config
* @param importance the importance of this config
* @param documentation the documentation string for the config
* @param group the group this config belongs to
* @param orderInGroup the order of this config in the group
* @param width the width of the config
* @param displayName the name suitable for display
* @return This ConfigDef so you can chain calls
*/
public ConfigDef define(String name, Type type, Importance importance, String documentation, String group, int orderInGroup,
Width width, String displayName) {
return define(name, type, NO_DEFAULT_VALUE, null, importance, documentation, group, orderInGroup, width, displayName, Collections.<String>emptyList());
}
/**
* Define a new configuration with no group, no order in group, no width, no display name, no dependents and no custom recommender
* @param name the name of the config parameter
* @param type the type of the config
* @param defaultValue the default value to use if this config isn't present
* @param validator the validator to use in checking the correctness of the config
* @param importance the importance of this config
* @param documentation the documentation string for the config
* @return This ConfigDef so you can chain calls
*/
public ConfigDef define(String name, Type type, Object defaultValue, Validator validator, Importance importance, String documentation) {
return define(name, type, defaultValue, validator, importance, documentation, null, -1, Width.NONE, name);
}
/**
* Define a new configuration with no special validation logic
* @param name The name of the config parameter
* @param type The type of the config
* @param defaultValue The default value to use if this config isn't present
* @param importance The importance of this config: is this something you will likely need to change.
* @param documentation The documentation string for the config
* @return This ConfigDef so you can chain calls
*/
public ConfigDef define(String name, Type type, Object defaultValue, Importance importance, String documentation) {
return define(name, type, defaultValue, null, importance, documentation);
}
/**
* Define a new configuration with no default value and no special validation logic
* @param name The name of the config parameter
* @param type The type of the config
* @param importance The importance of this config: is this something you will likely need to change.
* @param documentation The documentation string for the config
* @return This ConfigDef so you can chain calls
*/
public ConfigDef define(String name, Type type, Importance importance, String documentation) {
return define(name, type, NO_DEFAULT_VALUE, null, importance, documentation);
}
/**
* Define a new internal configuration. Internal configuration won't show up in the docs and aren't
* intended for general use.
* @param name The name of the config parameter
* @param type The type of the config
* @param defaultValue The default value to use if this config isn't present
* @param importance The importance of this config (i.e. is this something you will likely need to change?)
* @return This ConfigDef so you can chain calls
*/
public ConfigDef defineInternal(final String name, final Type type, final Object defaultValue, final Importance importance) {
return define(new ConfigKey(name, type, defaultValue, null, importance, "", "", -1, Width.NONE, name, Collections.<String>emptyList(), null, true));
}
/**
* Define a new internal configuration. Internal configuration won't show up in the docs and aren't
* intended for general use.
* @param name The name of the config parameter
* @param type The type of the config
* @param defaultValue The default value to use if this config isn't present
* @param validator The validator to use in checking the correctness of the config
* @param importance The importance of this config (i.e. is this something you will likely need to change?)
* @param documentation The documentation string for the config
* @return This ConfigDef so you can chain calls
*/
public ConfigDef defineInternal(final String name, final Type type, final Object defaultValue, final Validator validator, final Importance importance, final String documentation) {
return define(new ConfigKey(name, type, defaultValue, validator, importance, documentation, "", -1, Width.NONE, name, Collections.<String>emptyList(), null, true));
}
/**
* Get the configuration keys
* @return a map containing all configuration keys
*/
public Map<String, ConfigKey> configKeys() {
return configKeys;
}
/**
* Get the groups for the configuration
* @return a list of group names
*/
public List<String> groups() {
return groups;
}
/**
* Add standard SSL client configuration options.
* @return this
*/
public ConfigDef withClientSslSupport() {
SslConfigs.addClientSslSupport(this);
return this;
}
/**
* Add standard SASL client configuration options.
* @return this
*/
public ConfigDef withClientSaslSupport() {
SaslConfigs.addClientSaslSupport(this);
return this;
}
/**
* Parse and validate configs against this configuration definition. The input is a map of configs. It is expected
* that the keys of the map are strings, but the values can either be strings or they may already be of the
* appropriate type (int, string, etc). This will work equally well with either java.util.Properties instances or a
* programmatically constructed map.
*
* @param props The configs to parse and validate.
* @return Parsed and validated configs. The key will be the config name and the value will be the value parsed into
* the appropriate type (int, string, etc).
*/
public Map<String, Object> parse(Map<?, ?> props) {
// Check all configurations are defined
List<String> undefinedConfigKeys = undefinedDependentConfigs();
if (!undefinedConfigKeys.isEmpty()) {
String joined = Utils.join(undefinedConfigKeys, ",");
throw new ConfigException("Some configurations in are referred in the dependents, but not defined: " + joined);
}
// parse all known keys
Map<String, Object> values = new HashMap<>();
for (ConfigKey key : configKeys.values())
values.put(key.name, parseValue(key, props.get(key.name), props.containsKey(key.name)));
return values;
}
Object parseValue(ConfigKey key, Object value, boolean isSet) {
Object parsedValue;
if (isSet) {
parsedValue = parseType(key.name, value, key.type);
// props map doesn't contain setting, the key is required because no default value specified - its an error
} else if (NO_DEFAULT_VALUE.equals(key.defaultValue)) {
throw new ConfigException("Missing required configuration \"" + key.name + "\" which has no default value.");
} else {
// otherwise assign setting its default value
parsedValue = key.defaultValue;
}
if (key.validator != null) {
key.validator.ensureValid(key.name, parsedValue);
}
return parsedValue;
}
/**
* Validate the current configuration values with the configuration definition.
* @param props the current configuration values
* @return List of Config, each Config contains the updated configuration information given
* the current configuration values.
*/
public List<ConfigValue> validate(Map<String, String> props) {
return new ArrayList<>(validateAll(props).values());
}
public Map<String, ConfigValue> validateAll(Map<String, String> props) {
Map<String, ConfigValue> configValues = new HashMap<>();
for (String name: configKeys.keySet()) {
configValues.put(name, new ConfigValue(name));
}
List<String> undefinedConfigKeys = undefinedDependentConfigs();
for (String undefinedConfigKey: undefinedConfigKeys) {
ConfigValue undefinedConfigValue = new ConfigValue(undefinedConfigKey);
undefinedConfigValue.addErrorMessage(undefinedConfigKey + " is referred in the dependents, but not defined.");
undefinedConfigValue.visible(false);
configValues.put(undefinedConfigKey, undefinedConfigValue);
}
Map<String, Object> parsed = parseForValidate(props, configValues);
return validate(parsed, configValues);
}
// package accessible for testing
Map<String, Object> parseForValidate(Map<String, String> props, Map<String, ConfigValue> configValues) {
Map<String, Object> parsed = new HashMap<>();
Set<String> configsWithNoParent = getConfigsWithNoParent();
for (String name: configsWithNoParent) {
parseForValidate(name, props, parsed, configValues);
}
return parsed;
}
private Map<String, ConfigValue> validate(Map<String, Object> parsed, Map<String, ConfigValue> configValues) {
Set<String> configsWithNoParent = getConfigsWithNoParent();
for (String name: configsWithNoParent) {
validate(name, parsed, configValues);
}
return configValues;
}
private List<String> undefinedDependentConfigs() {
Set<String> undefinedConfigKeys = new HashSet<>();
for (ConfigKey configKey : configKeys.values()) {
for (String dependent: configKey.dependents) {
if (!configKeys.containsKey(dependent)) {
undefinedConfigKeys.add(dependent);
}
}
}
return new ArrayList<>(undefinedConfigKeys);
}
// package accessible for testing
Set<String> getConfigsWithNoParent() {
if (this.configsWithNoParent != null) {
return this.configsWithNoParent;
}
Set<String> configsWithParent = new HashSet<>();
for (ConfigKey configKey: configKeys.values()) {
List<String> dependents = configKey.dependents;
configsWithParent.addAll(dependents);
}
Set<String> configs = new HashSet<>(configKeys.keySet());
configs.removeAll(configsWithParent);
this.configsWithNoParent = configs;
return configs;
}
private void parseForValidate(String name, Map<String, String> props, Map<String, Object> parsed, Map<String, ConfigValue> configs) {
if (!configKeys.containsKey(name)) {
return;
}
ConfigKey key = configKeys.get(name);
ConfigValue config = configs.get(name);
Object value = null;
if (props.containsKey(key.name)) {
try {
value = parseType(key.name, props.get(key.name), key.type);
} catch (ConfigException e) {
config.addErrorMessage(e.getMessage());
}
} else if (NO_DEFAULT_VALUE.equals(key.defaultValue)) {
config.addErrorMessage("Missing required configuration \"" + key.name + "\" which has no default value.");
} else {
value = key.defaultValue;
}
if (key.validator != null) {
try {
key.validator.ensureValid(key.name, value);
} catch (ConfigException e) {
config.addErrorMessage(e.getMessage());
}
}
config.value(value);
parsed.put(name, value);
for (String dependent: key.dependents) {
parseForValidate(dependent, props, parsed, configs);
}
}
private void validate(String name, Map<String, Object> parsed, Map<String, ConfigValue> configs) {
if (!configKeys.containsKey(name)) {
return;
}
ConfigKey key = configKeys.get(name);
ConfigValue value = configs.get(name);
if (key.recommender != null) {
try {
List<Object> recommendedValues = key.recommender.validValues(name, parsed);
List<Object> originalRecommendedValues = value.recommendedValues();
if (!originalRecommendedValues.isEmpty()) {
Set<Object> originalRecommendedValueSet = new HashSet<>(originalRecommendedValues);
recommendedValues.removeIf(o -> !originalRecommendedValueSet.contains(o));
}
value.recommendedValues(recommendedValues);
value.visible(key.recommender.visible(name, parsed));
} catch (ConfigException e) {
value.addErrorMessage(e.getMessage());
}
}
configs.put(name, value);
for (String dependent: key.dependents) {
validate(dependent, parsed, configs);
}
}
/**
* Parse a value according to its expected type.
* @param name The config name
* @param value The config value
* @param type The expected type
* @return The parsed object
*/
public static Object parseType(String name, Object value, Type type) {
try {
if (value == null) return null;
String trimmed = null;
if (value instanceof String)
trimmed = ((String) value).trim();
switch (type) {
case BOOLEAN:
if (value instanceof String) {
if (trimmed.equalsIgnoreCase("true"))
return true;
else if (trimmed.equalsIgnoreCase("false"))
return false;
else
throw new ConfigException(name, value, "Expected value to be either true or false");
} else if (value instanceof Boolean)
return value;
else
throw new ConfigException(name, value, "Expected value to be either true or false");
case PASSWORD:
if (value instanceof Password)
return value;
else if (value instanceof String)
return new Password(trimmed);
else
throw new ConfigException(name, value, "Expected value to be a string, but it was a " + value.getClass().getName());
case STRING:
if (value instanceof String)
return trimmed;
else
throw new ConfigException(name, value, "Expected value to be a string, but it was a " + value.getClass().getName());
case INT:
if (value instanceof Integer) {
return value;
} else if (value instanceof String) {
return Integer.parseInt(trimmed);
} else {
throw new ConfigException(name, value, "Expected value to be a 32-bit integer, but it was a " + value.getClass().getName());
}
case SHORT:
if (value instanceof Short) {
return value;
} else if (value instanceof String) {
return Short.parseShort(trimmed);
} else {
throw new ConfigException(name, value, "Expected value to be a 16-bit integer (short), but it was a " + value.getClass().getName());
}
case LONG:
if (value instanceof Integer)
return ((Integer) value).longValue();
if (value instanceof Long)
return value;
else if (value instanceof String)
return Long.parseLong(trimmed);
else
throw new ConfigException(name, value, "Expected value to be a 64-bit integer (long), but it was a " + value.getClass().getName());
case DOUBLE:
if (value instanceof Number)
return ((Number) value).doubleValue();
else if (value instanceof String)
return Double.parseDouble(trimmed);
else
throw new ConfigException(name, value, "Expected value to be a double, but it was a " + value.getClass().getName());
case LIST:
if (value instanceof List)
return value;
else if (value instanceof String)
if (trimmed.isEmpty())
return Collections.emptyList();
else
return Arrays.asList(COMMA_WITH_WHITESPACE.split(trimmed, -1));
else
throw new ConfigException(name, value, "Expected a comma separated list.");
case CLASS:
if (value instanceof Class)
return value;
else if (value instanceof String) {
ClassLoader contextOrKafkaClassLoader = Utils.getContextOrKafkaClassLoader();
// Use loadClass here instead of Class.forName because the name we use here may be an alias
// and not match the name of the class that gets loaded. If that happens, Class.forName can
// throw an exception.
Class<?> klass = contextOrKafkaClassLoader.loadClass(trimmed);
// Invoke forName here with the true name of the requested class to cause class
// initialization to take place.
return Class.forName(klass.getName(), true, contextOrKafkaClassLoader);
} else
throw new ConfigException(name, value, "Expected a Class instance or class name.");
default:
throw new IllegalStateException("Unknown type.");
}
} catch (NumberFormatException e) {
throw new ConfigException(name, value, "Not a number of type " + type);
} catch (ClassNotFoundException e) {
throw new ConfigException(name, value, "Class " + value + " could not be found.");
}
}
public static String convertToString(Object parsedValue, Type type) {
if (parsedValue == null) {
return null;
}
if (type == null) {
return parsedValue.toString();
}
switch (type) {
case BOOLEAN:
case SHORT:
case INT:
case LONG:
case DOUBLE:
case STRING:
case PASSWORD:
return parsedValue.toString();
case LIST:
List<?> valueList = (List<?>) parsedValue;
return Utils.join(valueList, ",");
case CLASS:
Class<?> clazz = (Class<?>) parsedValue;
return clazz.getName();
default:
throw new IllegalStateException("Unknown type.");
}
}
/**
* Converts a map of config (key, value) pairs to a map of strings where each value
* is converted to a string. This method should be used with care since it stores
* actual password values to String. Values from this map should never be used in log entries.
*/
public static Map<String, String> convertToStringMapWithPasswordValues(Map<String, ?> configs) {
Map<String, String> result = new HashMap<>();
for (Map.Entry<String, ?> entry : configs.entrySet()) {
Object value = entry.getValue();
String strValue;
if (value instanceof Password)
strValue = ((Password) value).value();
else if (value instanceof List)
strValue = convertToString(value, Type.LIST);
else if (value instanceof Class)
strValue = convertToString(value, Type.CLASS);
else
strValue = convertToString(value, null);
if (strValue != null)
result.put(entry.getKey(), strValue);
}
return result;
}
/**
* The config types
*/
public enum Type {
BOOLEAN, STRING, INT, SHORT, LONG, DOUBLE, LIST, CLASS, PASSWORD;
public boolean isSensitive() {
return this == PASSWORD;
}
}
/**
* The importance level for a configuration
*/
public enum Importance {
HIGH, MEDIUM, LOW
}
/**
* The width of a configuration value
*/
public enum Width {
NONE, SHORT, MEDIUM, LONG
}
/**
* This is used by the {@link #validate(Map)} to get valid values for a configuration given the current
* configuration values in order to perform full configuration validation and visibility modification.
* In case that there are dependencies between configurations, the valid values and visibility
* for a configuration may change given the values of other configurations.
*/
public interface Recommender {
/**
* The valid values for the configuration given the current configuration values.
* @param name The name of the configuration
* @param parsedConfig The parsed configuration values
* @return The list of valid values. To function properly, the returned objects should have the type
* defined for the configuration using the recommender.
*/
List<Object> validValues(String name, Map<String, Object> parsedConfig);
/**
* Set the visibility of the configuration given the current configuration values.
* @param name The name of the configuration
* @param parsedConfig The parsed configuration values
* @return The visibility of the configuration
*/
boolean visible(String name, Map<String, Object> parsedConfig);
}
/**
* Validation logic the user may provide to perform single configuration validation.
*/
public interface Validator {
/**
* Perform single configuration validation.
* @param name The name of the configuration
* @param value The value of the configuration
* @throws ConfigException if the value is invalid.
*/
void ensureValid(String name, Object value);
}
/**
* Validation logic for numeric ranges
*/
public static class Range implements Validator {
private final Number min;
private final Number max;
/**
* A numeric range with inclusive upper bound and inclusive lower bound
* @param min the lower bound
* @param max the upper bound
*/
private Range(Number min, Number max) {
this.min = min;
this.max = max;
}
/**
* A numeric range that checks only the lower bound
*
* @param min The minimum acceptable value
*/
public static Range atLeast(Number min) {
return new Range(min, null);
}
/**
* A numeric range that checks both the upper (inclusive) and lower bound
*/
public static Range between(Number min, Number max) {
return new Range(min, max);
}
public void ensureValid(String name, Object o) {
if (o == null)
throw new ConfigException(name, null, "Value must be non-null");
Number n = (Number) o;
if (min != null && n.doubleValue() < min.doubleValue())
throw new ConfigException(name, o, "Value must be at least " + min);
if (max != null && n.doubleValue() > max.doubleValue())
throw new ConfigException(name, o, "Value must be no more than " + max);
}
public String toString() {
if (min == null && max == null)
return "[...]";
else if (min == null)
return "[...," + max + "]";
else if (max == null)
return "[" + min + ",...]";
else
return "[" + min + ",...," + max + "]";
}
}
public static class ValidList implements Validator {
final ValidString validString;
private ValidList(List<String> validStrings) {
this.validString = new ValidString(validStrings);
}
public static ValidList in(String... validStrings) {
return new ValidList(Arrays.asList(validStrings));
}
@Override
public void ensureValid(final String name, final Object value) {
@SuppressWarnings("unchecked")
List<String> values = (List<String>) value;
for (String string : values) {
validString.ensureValid(name, string);
}
}
public String toString() {
return validString.toString();
}
}
public static class ValidString implements Validator {
final List<String> validStrings;
private ValidString(List<String> validStrings) {
this.validStrings = validStrings;
}
public static ValidString in(String... validStrings) {
return new ValidString(Arrays.asList(validStrings));
}
@Override
public void ensureValid(String name, Object o) {
String s = (String) o;
if (!validStrings.contains(s)) {
throw new ConfigException(name, o, "String must be one of: " + Utils.join(validStrings, ", "));
}
}
public String toString() {
return "[" + Utils.join(validStrings, ", ") + "]";
}
}
public static class CaseInsensitiveValidString implements Validator {
final Set<String> validStrings;
private CaseInsensitiveValidString(List<String> validStrings) {
this.validStrings = validStrings.stream()
.map(s -> s.toUpperCase(Locale.ROOT))
.collect(Collectors.toSet());
}
public static CaseInsensitiveValidString in(String... validStrings) {
return new CaseInsensitiveValidString(Arrays.asList(validStrings));
}
@Override
public void ensureValid(String name, Object o) {
String s = (String) o;
if (s == null || !validStrings.contains(s.toUpperCase(Locale.ROOT))) {
throw new ConfigException(name, o, "String must be one of (case insensitive): " + Utils.join(validStrings, ", "));
}
}
public String toString() {
return "(case insensitive) [" + Utils.join(validStrings, ", ") + "]";
}
}
public static class NonNullValidator implements Validator {
@Override
public void ensureValid(String name, Object value) {
if (value == null) {
// Pass in the string null to avoid the spotbugs warning
throw new ConfigException(name, "null", "entry must be non null");
}
}
public String toString() {
return "non-null string";
}
}
public static class LambdaValidator implements Validator {
BiConsumer<String, Object> ensureValid;
Supplier<String> toStringFunction;
private LambdaValidator(BiConsumer<String, Object> ensureValid,
Supplier<String> toStringFunction) {
this.ensureValid = ensureValid;
this.toStringFunction = toStringFunction;
}
public static LambdaValidator with(BiConsumer<String, Object> ensureValid,
Supplier<String> toStringFunction) {
return new LambdaValidator(ensureValid, toStringFunction);
}
@Override
public void ensureValid(String name, Object value) {
ensureValid.accept(name, value);
}
@Override
public String toString() {
return toStringFunction.get();
}
}
public static class CompositeValidator implements Validator {
private final List<Validator> validators;
private CompositeValidator(List<Validator> validators) {
this.validators = Collections.unmodifiableList(validators);
}
public static CompositeValidator of(Validator... validators) {
return new CompositeValidator(Arrays.asList(validators));
}
@Override
public void ensureValid(String name, Object value) {
for (Validator validator: validators) {
validator.ensureValid(name, value);
}
}
@Override
public String toString() {
if (validators == null) return "";
StringBuilder desc = new StringBuilder();
for (Validator v: validators) {
if (desc.length() > 0) {
desc.append(',').append(' ');
}
desc.append(v);
}
return desc.toString();
}
}
public static class NonEmptyString implements Validator {
@Override
public void ensureValid(String name, Object o) {
String s = (String) o;
if (s != null && s.isEmpty()) {
throw new ConfigException(name, o, "String must be non-empty");
}
}
@Override
public String toString() {
return "non-empty string";
}
}
public static class NonEmptyStringWithoutControlChars implements Validator {
public static NonEmptyStringWithoutControlChars nonEmptyStringWithoutControlChars() {
return new NonEmptyStringWithoutControlChars();
}
@Override
public void ensureValid(String name, Object value) {
String s = (String) value;
if (s == null) {
// This can happen during creation of the config object due to no default value being defined for the
// name configuration - a missing name parameter is caught when checking for mandatory parameters,
// thus we can ok a null value here
return;
} else if (s.isEmpty()) {
throw new ConfigException(name, value, "String may not be empty");
}
// Check name string for illegal characters
ArrayList<Integer> foundIllegalCharacters = new ArrayList<>();
for (int i = 0; i < s.length(); i++) {
if (Character.isISOControl(s.codePointAt(i))) {
foundIllegalCharacters.add(s.codePointAt(i));
}
}
if (!foundIllegalCharacters.isEmpty()) {
throw new ConfigException(name, value, "String may not contain control sequences but had the following ASCII chars: " + Utils.join(foundIllegalCharacters, ", "));
}
}
public String toString() {
return "non-empty string without ISO control characters";
}
}
public static class ListSize implements Validator {
final int maxSize;
private ListSize(final int maxSize) {
this.maxSize = maxSize;
}
public static ListSize atMostOfSize(final int maxSize) {
return new ListSize(maxSize);
}
@Override
public void ensureValid(final String name, final Object value) {
@SuppressWarnings("unchecked")
List<String> values = (List<String>) value;
if (values.size() > maxSize) {
throw new ConfigException(name, value, "exceeds maximum list size of [" + maxSize + "].");
}
}
@Override
public String toString() {
return "List containing maximum of " + maxSize + " elements";
}
}
public static class ConfigKey {
public final String name;
public final Type type;
public final String documentation;
public final Object defaultValue;
public final Validator validator;
public final Importance importance;
public final String group;
public final int orderInGroup;
public final Width width;
public final String displayName;
public final List<String> dependents;
public final Recommender recommender;
public final boolean internalConfig;
public ConfigKey(String name, Type type, Object defaultValue, Validator validator,
Importance importance, String documentation, String group,
int orderInGroup, Width width, String displayName,
List<String> dependents, Recommender recommender,
boolean internalConfig) {
this.name = name;
this.type = type;
this.defaultValue = NO_DEFAULT_VALUE.equals(defaultValue) ? NO_DEFAULT_VALUE : parseType(name, defaultValue, type);
this.validator = validator;
this.importance = importance;
if (this.validator != null && hasDefault())
this.validator.ensureValid(name, this.defaultValue);
this.documentation = documentation;
this.dependents = dependents;
this.group = group;
this.orderInGroup = orderInGroup;
this.width = width;
this.displayName = displayName;
this.recommender = recommender;
this.internalConfig = internalConfig;
}
public boolean hasDefault() {
return !NO_DEFAULT_VALUE.equals(this.defaultValue);
}
public Type type() {
return type;
}
}
protected List<String> headers() {
return Arrays.asList("Name", "Description", "Type", "Default", "Valid Values", "Importance");
}
protected String getConfigValue(ConfigKey key, String headerName) {
switch (headerName) {
case "Name":
return key.name;
case "Description":
return key.documentation;
case "Type":
return key.type.toString().toLowerCase(Locale.ROOT);
case "Default":
if (key.hasDefault()) {
if (key.defaultValue == null)
return "null";
String defaultValueStr = convertToString(key.defaultValue, key.type);
if (defaultValueStr.isEmpty())
return "\"\"";
else {
String suffix = "";
if (key.name.endsWith(".bytes")) {
suffix = niceMemoryUnits(((Number) key.defaultValue).longValue());
} else if (key.name.endsWith(".ms")) {
suffix = niceTimeUnits(((Number) key.defaultValue).longValue());
}
return defaultValueStr + suffix;
}
} else
return "";
case "Valid Values":
return key.validator != null ? key.validator.toString() : "";
case "Importance":
return key.importance.toString().toLowerCase(Locale.ROOT);
default:
throw new RuntimeException("Can't find value for header '" + headerName + "' in " + key.name);
}
}
static String niceMemoryUnits(long bytes) {
long value = bytes;
int i = 0;
while (value != 0 && i < 4) {
if (value % 1024L == 0) {
value /= 1024L;
i++;
} else {
break;
}
}
String resultFormat = " (" + value + " %s" + (value == 1 ? ")" : "s)");
switch (i) {
case 1:
return String.format(resultFormat, "kibibyte");
case 2:
return String.format(resultFormat, "mebibyte");
case 3:
return String.format(resultFormat, "gibibyte");
case 4:
return String.format(resultFormat, "tebibyte");
default:
return "";
}
}
static String niceTimeUnits(long millis) {
long value = millis;
long[] divisors = {1000, 60, 60, 24};
String[] units = {"second", "minute", "hour", "day"};
int i = 0;
while (value != 0 && i < 4) {
if (value % divisors[i] == 0) {
value /= divisors[i];
i++;
} else {
break;
}
}
if (i > 0) {
return " (" + value + " " + units[i - 1] + (value > 1 ? "s)" : ")");
}
return "";
}
public String toHtmlTable() {
return toHtmlTable(Collections.<String, String>emptyMap());
}
private void addHeader(StringBuilder builder, String headerName) {
builder.append("<th>");
builder.append(headerName);
builder.append("</th>\n");
}
private void addColumnValue(StringBuilder builder, String value) {
builder.append("<td>");
builder.append(value);
builder.append("</td>");
}
/**
* Converts this config into an HTML table that can be embedded into docs.
* If <code>dynamicUpdateModes</code> is non-empty, a "Dynamic Update Mode" column
* will be included n the table with the value of the update mode. Default
* mode is "read-only".
* @param dynamicUpdateModes Config name -> update mode mapping
*/
public String toHtmlTable(Map<String, String> dynamicUpdateModes) {
boolean hasUpdateModes = !dynamicUpdateModes.isEmpty();
List<ConfigKey> configs = sortedConfigs();
StringBuilder b = new StringBuilder();
b.append("<table class=\"data-table\"><tbody>\n");
b.append("<tr>\n");
// print column headers
for (String headerName : headers()) {
addHeader(b, headerName);
}
if (hasUpdateModes)
addHeader(b, "Dynamic Update Mode");
b.append("</tr>\n");
for (ConfigKey key : configs) {
if (key.internalConfig) {
continue;
}
b.append("<tr>\n");
// print column values
for (String headerName : headers()) {
addColumnValue(b, getConfigValue(key, headerName));
b.append("</td>");
}
if (hasUpdateModes) {
String updateMode = dynamicUpdateModes.get(key.name);
if (updateMode == null)
updateMode = "read-only";
addColumnValue(b, updateMode);
}
b.append("</tr>\n");
}
b.append("</tbody></table>");
return b.toString();
}
/**
* Get the configs formatted with reStructuredText, suitable for embedding in Sphinx
* documentation.
*/
public String toRst() {
StringBuilder b = new StringBuilder();
for (ConfigKey key : sortedConfigs()) {
if (key.internalConfig) {
continue;
}
getConfigKeyRst(key, b);
b.append("\n");
}
return b.toString();
}
/**
* Configs with new metadata (group, orderInGroup, dependents) formatted with reStructuredText, suitable for embedding in Sphinx
* documentation.
*/
public String toEnrichedRst() {
StringBuilder b = new StringBuilder();
String lastKeyGroupName = "";
for (ConfigKey key : sortedConfigs()) {
if (key.internalConfig) {
continue;
}
if (key.group != null) {
if (!lastKeyGroupName.equalsIgnoreCase(key.group)) {
b.append(key.group).append("\n");
char[] underLine = new char[key.group.length()];
Arrays.fill(underLine, '^');
b.append(new String(underLine)).append("\n\n");
}
lastKeyGroupName = key.group;
}
getConfigKeyRst(key, b);
if (key.dependents != null && key.dependents.size() > 0) {
int j = 0;
b.append(" * Dependents: ");
for (String dependent : key.dependents) {
b.append("``");
b.append(dependent);
if (++j == key.dependents.size())
b.append("``");
else
b.append("``, ");
}
b.append("\n");
}
b.append("\n");
}
return b.toString();
}
/**
* Shared content on Rst and Enriched Rst.
*/
private void getConfigKeyRst(ConfigKey key, StringBuilder b) {
b.append("``").append(key.name).append("``").append("\n");
if (key.documentation != null) {
for (String docLine : key.documentation.split("\n")) {
if (docLine.length() == 0) {
continue;
}
b.append(" ").append(docLine).append("\n\n");
}
} else {
b.append("\n");
}
b.append(" * Type: ").append(getConfigValue(key, "Type")).append("\n");
if (key.hasDefault()) {
b.append(" * Default: ").append(getConfigValue(key, "Default")).append("\n");
}
if (key.validator != null) {
b.append(" * Valid Values: ").append(getConfigValue(key, "Valid Values")).append("\n");
}
b.append(" * Importance: ").append(getConfigValue(key, "Importance")).append("\n");
}
/**
* Get a list of configs sorted taking the 'group' and 'orderInGroup' into account.
*
* If grouping is not specified, the result will reflect "natural" order: listing required fields first, then ordering by importance, and finally by name.
*/
private List<ConfigKey> sortedConfigs() {
final Map<String, Integer> groupOrd = new HashMap<>(groups.size());
int ord = 0;
for (String group: groups) {
groupOrd.put(group, ord++);
}
List<ConfigKey> configs = new ArrayList<>(configKeys.values());
Collections.sort(configs, (k1, k2) -> compare(k1, k2, groupOrd));
return configs;
}
private int compare(ConfigKey k1, ConfigKey k2, Map<String, Integer> groupOrd) {
int cmp = k1.group == null
? (k2.group == null ? 0 : -1)
: (k2.group == null ? 1 : Integer.compare(groupOrd.get(k1.group), groupOrd.get(k2.group)));
if (cmp == 0) {
cmp = Integer.compare(k1.orderInGroup, k2.orderInGroup);
if (cmp == 0) {
// first take anything with no default value
if (!k1.hasDefault() && k2.hasDefault())
cmp = -1;
else if (!k2.hasDefault() && k1.hasDefault())
cmp = 1;
else {
cmp = k1.importance.compareTo(k2.importance);
if (cmp == 0)
return k1.name.compareTo(k2.name);
}
}
}
return cmp;
}
public void embed(final String keyPrefix, final String groupPrefix, final int startingOrd, final ConfigDef child) {
int orderInGroup = startingOrd;
for (ConfigKey key : child.sortedConfigs()) {
define(new ConfigKey(
keyPrefix + key.name,
key.type,
key.defaultValue,
embeddedValidator(keyPrefix, key.validator),
key.importance,
key.documentation,
groupPrefix + (key.group == null ? "" : ": " + key.group),
orderInGroup++,
key.width,
key.displayName,
embeddedDependents(keyPrefix, key.dependents),
embeddedRecommender(keyPrefix, key.recommender),
key.internalConfig));
}
}
/**
* Returns a new validator instance that delegates to the base validator but unprefixes the config name along the way.
*/
private static Validator embeddedValidator(final String keyPrefix, final Validator base) {
if (base == null) return null;
return new Validator() {
public void ensureValid(String name, Object value) {
base.ensureValid(name.substring(keyPrefix.length()), value);
}
@Override
public String toString() {
return base.toString();
}
};
}
/**
* Updated list of dependent configs with the specified {@code prefix} added.
*/
private static List<String> embeddedDependents(final String keyPrefix, final List<String> dependents) {
if (dependents == null) return null;
final List<String> updatedDependents = new ArrayList<>(dependents.size());
for (String dependent : dependents) {
updatedDependents.add(keyPrefix + dependent);
}
return updatedDependents;
}
/**
* Returns a new recommender instance that delegates to the base recommender but unprefixes the input parameters along the way.
*/
private static Recommender embeddedRecommender(final String keyPrefix, final Recommender base) {
if (base == null) return null;
return new Recommender() {
private String unprefixed(String k) {
return k.substring(keyPrefix.length());
}
private Map<String, Object> unprefixed(Map<String, Object> parsedConfig) {
final Map<String, Object> unprefixedParsedConfig = new HashMap<>(parsedConfig.size());
for (Map.Entry<String, Object> e : parsedConfig.entrySet()) {
if (e.getKey().startsWith(keyPrefix)) {
unprefixedParsedConfig.put(unprefixed(e.getKey()), e.getValue());
}
}
return unprefixedParsedConfig;
}
@Override
public List<Object> validValues(String name, Map<String, Object> parsedConfig) {
return base.validValues(unprefixed(name), unprefixed(parsedConfig));
}
@Override
public boolean visible(String name, Map<String, Object> parsedConfig) {
return base.visible(unprefixed(name), unprefixed(parsedConfig));
}
};
}
public String toHtml() {
return toHtml(Collections.emptyMap());
}
/**
* Converts this config into an HTML list that can be embedded into docs.
* @param headerDepth The top level header depth in the generated HTML.
* @param idGenerator A function for computing the HTML id attribute in the generated HTML from a given config name.
*/
public String toHtml(int headerDepth, Function<String, String> idGenerator) {
return toHtml(headerDepth, idGenerator, Collections.emptyMap());
}
/**
* Converts this config into an HTML list that can be embedded into docs.
* If <code>dynamicUpdateModes</code> is non-empty, a "Dynamic Update Mode" label
* will be included in the config details with the value of the update mode. Default
* mode is "read-only".
* @param dynamicUpdateModes Config name -> update mode mapping.
*/
public String toHtml(Map<String, String> dynamicUpdateModes) {
return toHtml(4, Function.identity(), dynamicUpdateModes);
}
/**
* Converts this config into an HTML list that can be embedded into docs.
* If <code>dynamicUpdateModes</code> is non-empty, a "Dynamic Update Mode" label
* will be included in the config details with the value of the update mode. Default
* mode is "read-only".
* @param headerDepth The top level header depth in the generated HTML.
* @param idGenerator A function for computing the HTML id attribute in the generated HTML from a given config name.
* @param dynamicUpdateModes Config name -> update mode mapping.
*/
public String toHtml(int headerDepth, Function<String, String> idGenerator,
Map<String, String> dynamicUpdateModes) {
boolean hasUpdateModes = !dynamicUpdateModes.isEmpty();
List<ConfigKey> configs = sortedConfigs();
StringBuilder b = new StringBuilder();
b.append("<ul class=\"config-list\">\n");
for (ConfigKey key : configs) {
if (key.internalConfig) {
continue;
}
b.append("<li>\n");
b.append(String.format("<h%1$d>" +
"<a id=\"%3$s\"></a><a id=\"%2$s\" href=\"#%2$s\">%3$s</a>" +
"</h%1$d>%n", headerDepth, idGenerator.apply(key.name), key.name));
b.append("<p>");
if (key.documentation != null) {
b.append(key.documentation.replaceAll("\n", "<br>"));
}
b.append("</p>\n");
b.append("<table>" +
"<tbody>\n");
for (String detail : headers()) {
if (detail.equals("Name") || detail.equals("Description")) continue;
addConfigDetail(b, detail, getConfigValue(key, detail));
}
if (hasUpdateModes) {
String updateMode = dynamicUpdateModes.get(key.name);
if (updateMode == null)
updateMode = "read-only";
addConfigDetail(b, "Update Mode", updateMode);
}
b.append("</tbody></table>\n");
b.append("</li>\n");
}
b.append("</ul>\n");
return b.toString();
}
private static void addConfigDetail(StringBuilder builder, String name, String value) {
builder.append("<tr>" +
"<th>" + name + ":</th>" +
"<td>" + value + "</td>" +
"</tr>\n");
}
}
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