dubbo MetadataInfo 源码
dubbo MetadataInfo 代码
文件路径：/dubbo-metadata/dubbo-metadata-api/src/main/java/org/apache/dubbo/metadata/MetadataInfo.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.dubbo.metadata;
import org.apache.dubbo.common.ProtocolServiceKey;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.extension.ExtensionLoader;
import org.apache.dubbo.common.logger.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.common.url.component.URLParam;
import org.apache.dubbo.common.utils.ArrayUtils;
import org.apache.dubbo.common.utils.CollectionUtils;
import org.apache.dubbo.common.utils.JsonUtils;
import org.apache.dubbo.common.utils.StringUtils;
import java.beans.Transient;
import java.io.Serializable;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeMap;
import java.util.TreeSet;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentNavigableMap;
import java.util.concurrent.ConcurrentSkipListMap;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.stream.Collectors;
import static org.apache.dubbo.common.constants.CommonConstants.DOT_SEPARATOR;
import static org.apache.dubbo.common.constants.CommonConstants.GROUP_CHAR_SEPARATOR;
import static org.apache.dubbo.common.constants.CommonConstants.METHODS_KEY;
import static org.apache.dubbo.common.constants.CommonConstants.TIMESTAMP_KEY;
import static org.apache.dubbo.metadata.RevisionResolver.EMPTY_REVISION;
public class MetadataInfo implements Serializable {
public static final MetadataInfo EMPTY = new MetadataInfo();
private static final Logger logger = LoggerFactory.getLogger(MetadataInfo.class);
private String app;
// revision that will report to registry or remote meta center, must always update together with rawMetadataInfo, check {@link this#calAndGetRevision}
private volatile String revision;
// key format is '{group}/{interface name}:{version}:{protocol}'
private final Map<String, ServiceInfo> services;
/* used at runtime */
private transient AtomicBoolean initiated = new AtomicBoolean(false);
// Json formatted metadata that will report to remote meta center, must always update together with revision, check {@link this#calAndGetRevision}
private transient volatile String rawMetadataInfo;
// key format is '{group}/{interface name}:{version}'
private transient Map<String, Set<ServiceInfo>> subscribedServices;
private transient final Map<String, String> extendParams;
private transient final Map<String, String> instanceParams;
protected transient volatile boolean updated = false;
private transient ConcurrentNavigableMap<String, SortedSet<URL>> subscribedServiceURLs;
private transient ConcurrentNavigableMap<String, SortedSet<URL>> exportedServiceURLs;
private transient ExtensionLoader<MetadataParamsFilter> loader;
public MetadataInfo() {
this(null);
}
public MetadataInfo(String app) {
this(app, null, null);
}
public MetadataInfo(String app, String revision, Map<String, ServiceInfo> services) {
this.app = app;
this.revision = revision;
this.services = services == null ? new ConcurrentHashMap<>() : services;
this.extendParams = new ConcurrentHashMap<>();
this.instanceParams = new ConcurrentHashMap<>();
}
private MetadataInfo(String app, String revision, Map<String, ServiceInfo> services, AtomicBoolean initiated,
Map<String, String> extendParams, Map<String, String> instanceParams, boolean updated,
ConcurrentNavigableMap<String, SortedSet<URL>> subscribedServiceURLs,
ConcurrentNavigableMap<String, SortedSet<URL>> exportedServiceURLs,
ExtensionLoader<MetadataParamsFilter> loader) {
this.app = app;
this.revision = revision;
this.services = new ConcurrentHashMap<>(services);
this.initiated = new AtomicBoolean(initiated.get());
this.extendParams = new ConcurrentHashMap<>(extendParams);
this.instanceParams = new ConcurrentHashMap<>(instanceParams);
this.updated = updated;
this.subscribedServiceURLs = subscribedServiceURLs == null ? null : new ConcurrentSkipListMap<>(subscribedServiceURLs);
this.exportedServiceURLs = exportedServiceURLs == null ? null : new ConcurrentSkipListMap<>(exportedServiceURLs);
this.loader = loader;
}
/**
* Initialize is needed when MetadataInfo is created from deserialization on the consumer side before being used for RPC call.
*/
public void init() {
if (!initiated.compareAndSet(false, true)) {
return;
}
if (CollectionUtils.isNotEmptyMap(services)) {
services.forEach((_k, serviceInfo) -> {
serviceInfo.init();
// create duplicate serviceKey(without protocol)->serviceInfo mapping to support metadata search when protocol is not specified on consumer side.
if (subscribedServices == null) {
subscribedServices = new HashMap<>();
}
Set<ServiceInfo> serviceInfos = subscribedServices.computeIfAbsent(serviceInfo.getServiceKey(), _key -> new HashSet<>());
serviceInfos.add(serviceInfo);
});
}
}
public synchronized void addService(URL url) {
// fixme, pass in application mode context during initialization of MetadataInfo.
if (this.loader == null) {
this.loader = url.getOrDefaultApplicationModel().getExtensionLoader(MetadataParamsFilter.class);
}
List<MetadataParamsFilter> filters = loader.getActivateExtension(url, "params-filter");
// generate service level metadata
ServiceInfo serviceInfo = new ServiceInfo(url, filters);
this.services.put(serviceInfo.getMatchKey(), serviceInfo);
// extract common instance level params
extractInstanceParams(url, filters);
if (exportedServiceURLs == null) {
exportedServiceURLs = new ConcurrentSkipListMap<>();
}
addURL(exportedServiceURLs, url);
updated = true;
}
public synchronized void removeService(URL url) {
if (url == null) {
return;
}
this.services.remove(url.getProtocolServiceKey());
if (exportedServiceURLs != null) {
removeURL(exportedServiceURLs, url);
}
updated = true;
}
public String getRevision() {
return revision;
}
/**
* Calculation of this instance's status like revision and modification of the same instance must be synchronized among different threads.
* <p>
* Usage of this method is strictly restricted to certain points such as when during registration. Always try to use {@link this#getRevision()} instead.
*/
public synchronized String calAndGetRevision() {
if (revision != null && !updated) {
return revision;
}
updated = false;
if (CollectionUtils.isEmptyMap(services)) {
this.revision = EMPTY_REVISION;
} else {
StringBuilder sb = new StringBuilder();
sb.append(app);
for (Map.Entry<String, ServiceInfo> entry : new TreeMap<>(services).entrySet()) {
sb.append(entry.getValue().toDescString());
}
String tempRevision = RevisionResolver.calRevision(sb.toString());
if (!StringUtils.isEquals(this.revision, tempRevision)) {
if (logger.isInfoEnabled()) {
logger.info(String.format("metadata revision changed: %s -> %s, app: %s, services: %d", this.revision, tempRevision, this.app, this.services.size()));
}
this.revision = tempRevision;
this.rawMetadataInfo = JsonUtils.getJson().toJson(this);
}
}
return revision;
}
public void setRevision(String revision) {
this.revision = revision;
}
@Transient
public String getContent() {
return this.rawMetadataInfo;
}
public String getApp() {
return app;
}
public void setApp(String app) {
this.app = app;
}
public Map<String, ServiceInfo> getServices() {
return services;
}
/**
* Get service info of an interface with specified group, version and protocol
* @param protocolServiceKey key is of format '{group}/{interface name}:{version}:{protocol}'
* @return the specific service info related to protocolServiceKey
*/
public ServiceInfo getServiceInfo(String protocolServiceKey) {
return services.get(protocolServiceKey);
}
/**
* Get service infos of an interface with specified group, version.
* There may have several service infos of different protocols, this method will simply pick the first one.
*
* @param serviceKeyWithoutProtocol key is of format '{group}/{interface name}:{version}'
* @return the first service info related to serviceKey
*/
public ServiceInfo getNoProtocolServiceInfo(String serviceKeyWithoutProtocol) {
if (CollectionUtils.isEmptyMap(subscribedServices)) {
return null;
}
Set<ServiceInfo> subServices = subscribedServices.get(serviceKeyWithoutProtocol);
if (CollectionUtils.isNotEmpty(subServices)) {
return subServices.iterator().next();
}
return null;
}
public ServiceInfo getValidServiceInfo(String serviceKey) {
ServiceInfo serviceInfo = getServiceInfo(serviceKey);
if (serviceInfo == null) {
serviceInfo = getNoProtocolServiceInfo(serviceKey);
if (serviceInfo == null) {
return null;
}
}
return serviceInfo;
}
public List<ServiceInfo> getMatchedServiceInfos(ProtocolServiceKey consumerProtocolServiceKey) {
return getServices().values()
.stream()
.filter(serviceInfo -> serviceInfo.matchProtocolServiceKey(consumerProtocolServiceKey))
.collect(Collectors.toList());
}
public Map<String, String> getExtendParams() {
return extendParams;
}
public Map<String, String> getInstanceParams() {
return instanceParams;
}
public String getParameter(String key, String serviceKey) {
ServiceInfo serviceInfo = getValidServiceInfo(serviceKey);
if (serviceInfo == null) return null;
return serviceInfo.getParameter(key);
}
public Map<String, String> getParameters(String serviceKey) {
ServiceInfo serviceInfo = getValidServiceInfo(serviceKey);
if (serviceInfo == null) {
return Collections.emptyMap();
}
return serviceInfo.getAllParams();
}
public String getServiceString(String protocolServiceKey) {
if (protocolServiceKey == null) {
return null;
}
ServiceInfo serviceInfo = getValidServiceInfo(protocolServiceKey);
if (serviceInfo == null) {
return null;
}
return serviceInfo.toFullString();
}
public synchronized void addSubscribedURL(URL url) {
if (subscribedServiceURLs == null) {
subscribedServiceURLs = new ConcurrentSkipListMap<>();
}
addURL(subscribedServiceURLs, url);
}
public boolean removeSubscribedURL(URL url) {
if (subscribedServiceURLs == null) {
return true;
}
return removeURL(subscribedServiceURLs, url);
}
public ConcurrentNavigableMap<String, SortedSet<URL>> getSubscribedServiceURLs() {
return subscribedServiceURLs;
}
public ConcurrentNavigableMap<String, SortedSet<URL>> getExportedServiceURLs() {
return exportedServiceURLs;
}
private boolean addURL(Map<String, SortedSet<URL>> serviceURLs, URL url) {
SortedSet<URL> urls = serviceURLs.computeIfAbsent(url.getServiceKey(), this::newSortedURLs);
// make sure the parameters of tmpUrl is variable
return urls.add(url);
}
boolean removeURL(Map<String, SortedSet<URL>> serviceURLs, URL url) {
String key = url.getServiceKey();
SortedSet<URL> urls = serviceURLs.getOrDefault(key, null);
if (urls == null) {
return true;
}
boolean r = urls.remove(url);
// if it is empty
if (urls.isEmpty()) {
serviceURLs.remove(key);
}
return r;
}
private SortedSet<URL> newSortedURLs(String serviceKey) {
return new TreeSet<>(URLComparator.INSTANCE);
}
@Override
public int hashCode() {
return Objects.hash(app, services);
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof MetadataInfo)) {
return false;
}
MetadataInfo other = (MetadataInfo)obj;
return Objects.equals(app, other.getApp())
&& ((services == null && other.services == null)
|| (services != null && services.equals(other.services)));
}
private void extractInstanceParams(URL url, List<MetadataParamsFilter> filters) {
if (CollectionUtils.isEmpty(filters)) {
return;
}
String[] included, excluded;
if (filters.size() == 1) {
MetadataParamsFilter filter = filters.get(0);
included = filter.instanceParamsIncluded();
excluded = filter.instanceParamsExcluded();
} else {
Set<String> includedList = new HashSet<>();
Set<String> excludedList = new HashSet<>();
filters.forEach(filter -> {
if (ArrayUtils.isNotEmpty(filter.instanceParamsIncluded())) {
includedList.addAll(Arrays.asList(filter.instanceParamsIncluded()));
}
if (ArrayUtils.isNotEmpty(filter.instanceParamsExcluded())) {
excludedList.addAll(Arrays.asList(filter.instanceParamsExcluded()));
}
});
included = includedList.toArray(new String[0]);
excluded = excludedList.toArray(new String[0]);
}
Map<String, String> tmpInstanceParams = new HashMap<>();
if (ArrayUtils.isNotEmpty(included)) {
for (String p : included) {
String value = url.getParameter(p);
if (value != null) {
tmpInstanceParams.put(p, value);
}
}
} else if (ArrayUtils.isNotEmpty(excluded)) {
tmpInstanceParams.putAll(url.getParameters());
for (String p : excluded) {
tmpInstanceParams.remove(p);
}
}
tmpInstanceParams.forEach((key, value) -> {
String oldValue = instanceParams.put(key, value);
if (!TIMESTAMP_KEY.equals(key) && oldValue != null && !oldValue.equals(value)) {
throw new IllegalStateException(String.format("Inconsistent instance metadata found in different services: %s, %s", oldValue, value));
}
});
}
@Override
public String toString() {
return "metadata{" +
"app='" + app + "'," +
"revision='" + revision + "'," +
"size=" + (services == null ? 0 : services.size()) + "," +
"services=" + getSimplifiedServices(services) +
"}";
}
public String toFullString() {
return "metadata{" +
"app='" + app + "'," +
"revision='" + revision + "'," +
"services=" + services +
"}";
}
private String getSimplifiedServices(Map<String, ServiceInfo> services) {
if (services == null) {
return "[]";
}
return services.keySet().toString();
}
@Override
public synchronized MetadataInfo clone() {
return new MetadataInfo(app, revision, services, initiated, extendParams, instanceParams, updated, subscribedServiceURLs, exportedServiceURLs, loader);
}
private Object readResolve() {
// create a new object from the deserialized one, in order to call constructor
return new MetadataInfo(this.app, this.revision, this.services);
}
public static class ServiceInfo implements Serializable {
private String name;
private String group;
private String version;
private String protocol;
private int port = -1;
private String path; // most of the time, path is the same with the interface name.
private Map<String, String> params;
// params configured on consumer side,
private volatile transient Map<String, String> consumerParams;
// cached method params
private volatile transient Map<String, Map<String, String>> methodParams;
private volatile transient Map<String, Map<String, String>> consumerMethodParams;
// cached numbers
private volatile transient Map<String, Number> numbers;
private volatile transient Map<String, Map<String, Number>> methodNumbers;
// service + group + version
private volatile transient String serviceKey;
// service + group + version + protocol
private volatile transient String matchKey;
private volatile transient ProtocolServiceKey protocolServiceKey;
private transient URL url;
public ServiceInfo() {}
public ServiceInfo(URL url, List<MetadataParamsFilter> filters) {
this(url.getServiceInterface(), url.getGroup(), url.getVersion(), url.getProtocol(), url.getPort(), url.getPath(), null);
this.url = url;
Map<String, String> params = extractServiceParams(url, filters);
// initialize method params caches.
this.methodParams = URLParam.initMethodParameters(params);
this.consumerMethodParams = URLParam.initMethodParameters(consumerParams);
}
public ServiceInfo(String name, String group, String version, String protocol, int port, String path, Map<String, String> params) {
this.name = name;
this.group = group;
this.version = version;
this.protocol = protocol;
this.port = port;
this.path = path;
this.params = params == null ? new ConcurrentHashMap<>() : params;
this.serviceKey = buildServiceKey(name, group, version);
this.matchKey = buildMatchKey();
}
private Map<String, String> extractServiceParams(URL url, List<MetadataParamsFilter> filters) {
Map<String, String> params = new HashMap<>();
if (CollectionUtils.isEmpty(filters)) {
params.putAll(url.getParameters());
this.params = params;
return params;
}
String[] included, excluded;
if (filters.size() == 1) {
included = filters.get(0).serviceParamsIncluded();
excluded = filters.get(0).serviceParamsExcluded();
} else {
Set<String> includedList = new HashSet<>();
Set<String> excludedList = new HashSet<>();
for (MetadataParamsFilter filter : filters) {
if (ArrayUtils.isNotEmpty(filter.serviceParamsIncluded())) {
includedList.addAll(Arrays.asList(filter.serviceParamsIncluded()));
}
if (ArrayUtils.isNotEmpty(filter.serviceParamsExcluded())) {
excludedList.addAll(Arrays.asList(filter.serviceParamsExcluded()));
}
}
included = includedList.toArray(new String[0]);
excluded = excludedList.toArray(new String[0]);
}
if (ArrayUtils.isNotEmpty(included)) {
String[] methods = url.getParameter(METHODS_KEY, (String[]) null);
for (String p : included) {
String value = url.getParameter(p);
if (StringUtils.isNotEmpty(value) && params.get(p) == null) {
params.put(p, value);
}
appendMethodParams(url, params, methods, p);
}
} else if (ArrayUtils.isNotEmpty(excluded)) {
for (Map.Entry<String, String> entry : url.getParameters().entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
boolean shouldAdd = true;
for (String excludeKey : excluded) {
if (key.equalsIgnoreCase(excludeKey) || key.contains("." + excludeKey)) {
shouldAdd = false;
break;
}
}
if (shouldAdd) {
params.put(key, value);
}
}
}
this.params = params;
return params;
}
private void appendMethodParams(URL url, Map<String, String> params, String[] methods, String p) {
if (methods != null) {
for (String method : methods) {
String mValue = url.getMethodParameterStrict(method, p);
if (StringUtils.isNotEmpty(mValue)) {
params.put(method + DOT_SEPARATOR + p, mValue);
}
}
}
}
/**
* Initialize necessary caches right after deserialization on the consumer side
*/
protected void init() {
buildMatchKey();
buildServiceKey(name, group, version);
// init method params
this.methodParams = URLParam.initMethodParameters(params);
// Actually, consumer params is empty after deserialized on the consumer side, so no need to initialize.
// Check how InstanceAddressURL operates on consumer url for more detail.
// this.consumerMethodParams = URLParam.initMethodParameters(consumerParams);
// no need to init numbers for it's only for cache purpose
}
public String getMatchKey() {
if (matchKey != null) {
return matchKey;
}
buildMatchKey();
return matchKey;
}
private String buildMatchKey() {
matchKey = getServiceKey();
if (StringUtils.isNotEmpty(protocol)) {
matchKey = getServiceKey() + GROUP_CHAR_SEPARATOR + protocol;
}
return matchKey;
}
public boolean matchProtocolServiceKey(ProtocolServiceKey protocolServiceKey) {
return ProtocolServiceKey.Matcher.isMatch(protocolServiceKey, getProtocolServiceKey());
}
public ProtocolServiceKey getProtocolServiceKey() {
if (protocolServiceKey != null) {
return protocolServiceKey;
}
protocolServiceKey = new ProtocolServiceKey(name, version, group, protocol);
return protocolServiceKey;
}
private String buildServiceKey(String name, String group, String version) {
this.serviceKey = URL.buildKey(name, group, version);
return this.serviceKey;
}
public String getServiceKey() {
if (serviceKey != null) {
return serviceKey;
}
buildServiceKey(name, group, version);
return serviceKey;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getGroup() {
return group;
}
public void setGroup(String group) {
this.group = group;
}
public String getVersion() {
return version;
}
public void setVersion(String version) {
this.version = version;
}
public String getPath() {
return path;
}
public void setPath(String path) {
this.path = path;
}
public String getProtocol() {
return protocol;
}
public void setProtocol(String protocol) {
this.protocol = protocol;
}
public int getPort() {
return port;
}
public void setPort(int port) {
this.port = port;
}
public Map<String, String> getParams() {
if (params == null) {
return Collections.emptyMap();
}
return params;
}
public void setParams(Map<String, String> params) {
this.params = params;
}
@Transient
public Map<String, String> getAllParams() {
if (consumerParams != null) {
Map<String, String> allParams = new HashMap<>((int) ((params.size() + consumerParams.size()) / 0.75f + 1));
allParams.putAll(params);
allParams.putAll(consumerParams);
return allParams;
}
return params;
}
public String getParameter(String key) {
if (consumerParams != null) {
String value = consumerParams.get(key);
if (value != null) {
return value;
}
}
return params.get(key);
}
public String getMethodParameter(String method, String key, String defaultValue) {
String value = getMethodParameter(method, key, consumerMethodParams);
if (value != null) {
return value;
}
value = getMethodParameter(method, key, methodParams);
return value == null ? defaultValue : value;
}
private String getMethodParameter(String method, String key, Map<String, Map<String, String>> map) {
String value = null;
if (map == null) {
return value;
}
Map<String, String> keyMap = map.get(method);
if (keyMap != null) {
value = keyMap.get(key);
}
return value;
}
public boolean hasMethodParameter(String method, String key) {
String value = this.getMethodParameter(method, key, (String) null);
return StringUtils.isNotEmpty(value);
}
public boolean hasMethodParameter(String method) {
return (consumerMethodParams != null && consumerMethodParams.containsKey(method))
|| (methodParams != null && methodParams.containsKey(method));
}
public String toDescString() {
return this.getMatchKey() + port + path + new TreeMap<>(getParams());
}
public void addParameter(String key, String value) {
if (consumerParams != null) {
this.consumerParams.put(key, value);
}
// refresh method params
consumerMethodParams = URLParam.initMethodParameters(consumerParams);
}
public void addParameterIfAbsent(String key, String value) {
if (consumerParams != null) {
this.consumerParams.putIfAbsent(key, value);
}
// refresh method params
consumerMethodParams = URLParam.initMethodParameters(consumerParams);
}
public void addConsumerParams(Map<String, String> params) {
// copy once for one service subscription
if (consumerParams == null) {
consumerParams = new ConcurrentHashMap<>(params);
// init method params
consumerMethodParams = URLParam.initMethodParameters(consumerParams);
}
}
public Map<String, Number> getNumbers() {
// concurrent initialization is tolerant
if (numbers == null) {
numbers = new ConcurrentHashMap<>();
}
return numbers;
}
public Map<String, Map<String, Number>> getMethodNumbers() {
if (methodNumbers == null) { // concurrent initialization is tolerant
methodNumbers = new ConcurrentHashMap<>();
}
return methodNumbers;
}
public URL getUrl() {
return url;
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (!(obj instanceof ServiceInfo)) {
return false;
}
ServiceInfo serviceInfo = (ServiceInfo) obj;
/**
* Equals to Objects.equals(this.getMatchKey(), serviceInfo.getMatchKey()), but match key will not get initialized
* on json deserialization.
*/
return Objects.equals(this.getVersion(), serviceInfo.getVersion())
&& Objects.equals(this.getGroup(), serviceInfo.getGroup())
&& Objects.equals(this.getName(), serviceInfo.getName())
&& Objects.equals(this.getProtocol(), serviceInfo.getProtocol())
&& Objects.equals(this.getPort(), serviceInfo.getPort())
&& this.getParams().equals(serviceInfo.getParams());
}
@Override
public int hashCode() {
return Objects.hash(getVersion(), getGroup(), getName(), getProtocol(), getPort(), getParams());
}
@Override
public String toString() {
return getMatchKey();
}
public String toFullString() {
return "service{" +
"name='" + name + "'," +
"group='" + group + "'," +
"version='" + version + "'," +
"protocol='" + protocol + "'," +
"port='" + port + "'," +
"params=" + params + "," +
"}";
}
}
static class URLComparator implements Comparator<URL> {
public static final URLComparator INSTANCE = new URLComparator();
@Override
public int compare(URL o1, URL o2) {
return o1.toFullString().compareTo(o2.toFullString());
}
}
}
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