spring-data-redis JedisClusterConnection 源码
spring-data-redis JedisClusterConnection 代码
文件路径：/src/main/java/org/springframework/data/redis/connection/jedis/JedisClusterConnection.java
/*
* Copyright 2015-2022 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.data.redis.connection.jedis;
import redis.clients.jedis.Connection;
import redis.clients.jedis.ConnectionPool;
import redis.clients.jedis.HostAndPort;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisCluster;
import redis.clients.jedis.providers.ClusterConnectionProvider;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.DirectFieldAccessor;
import org.springframework.beans.PropertyAccessor;
import org.springframework.dao.DataAccessException;
import org.springframework.dao.DataAccessResourceFailureException;
import org.springframework.dao.InvalidDataAccessApiUsageException;
import org.springframework.data.redis.ClusterStateFailureException;
import org.springframework.data.redis.ExceptionTranslationStrategy;
import org.springframework.data.redis.FallbackExceptionTranslationStrategy;
import org.springframework.data.redis.RedisSystemException;
import org.springframework.data.redis.connection.*;
import org.springframework.data.redis.connection.ClusterCommandExecutor.ClusterCommandCallback;
import org.springframework.data.redis.connection.ClusterCommandExecutor.MultiKeyClusterCommandCallback;
import org.springframework.data.redis.connection.ClusterCommandExecutor.NodeResult;
import org.springframework.data.redis.connection.RedisClusterNode.SlotRange;
import org.springframework.data.redis.connection.convert.Converters;
import org.springframework.data.redis.core.Cursor;
import org.springframework.data.redis.core.ScanOptions;
import org.springframework.data.util.DirectFieldAccessFallbackBeanWrapper;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* {@link RedisClusterConnection} implementation on top of {@link JedisCluster}.<br/>
* Uses the native {@link JedisCluster} api where possible and falls back to direct node communication using
* {@link Jedis} where needed.
*
* @author Christoph Strobl
* @author Mark Paluch
* @author Ninad Divadkar
* @author Tao Chen
* @author Chen Guanqun
* @author Pavel Khokhlov
* @author Liming Deng
* @since 1.7
*/
public class JedisClusterConnection implements RedisClusterConnection {
private static final ExceptionTranslationStrategy EXCEPTION_TRANSLATION = new FallbackExceptionTranslationStrategy(
JedisExceptionConverter.INSTANCE);
private final Log log = LogFactory.getLog(getClass());
private final JedisCluster cluster;
private final JedisClusterGeoCommands geoCommands = new JedisClusterGeoCommands(this);
private final JedisClusterHashCommands hashCommands = new JedisClusterHashCommands(this);
private final JedisClusterHyperLogLogCommands hllCommands = new JedisClusterHyperLogLogCommands(this);
private final JedisClusterKeyCommands keyCommands = new JedisClusterKeyCommands(this);
private final JedisClusterListCommands listCommands = new JedisClusterListCommands(this);
private final JedisClusterSetCommands setCommands = new JedisClusterSetCommands(this);
private final JedisClusterServerCommands serverCommands = new JedisClusterServerCommands(this);
private final JedisClusterStreamCommands streamCommands = new JedisClusterStreamCommands(this);
private final JedisClusterStringCommands stringCommands = new JedisClusterStringCommands(this);
private final JedisClusterZSetCommands zSetCommands = new JedisClusterZSetCommands(this);
private boolean closed;
private final ClusterTopologyProvider topologyProvider;
private final ClusterCommandExecutor clusterCommandExecutor;
private final boolean disposeClusterCommandExecutorOnClose;
private volatile @Nullable JedisSubscription subscription;
/**
* Create new {@link JedisClusterConnection} utilizing native connections via {@link JedisCluster}.
*
* @param cluster must not be {@literal null}.
*/
public JedisClusterConnection(JedisCluster cluster) {
Assert.notNull(cluster, "JedisCluster must not be null");
this.cluster = cluster;
closed = false;
topologyProvider = new JedisClusterTopologyProvider(cluster);
clusterCommandExecutor = new ClusterCommandExecutor(topologyProvider,
new JedisClusterNodeResourceProvider(cluster, topologyProvider), EXCEPTION_TRANSLATION);
disposeClusterCommandExecutorOnClose = true;
try {
DirectFieldAccessor executorDfa = new DirectFieldAccessor(cluster);
Object custerCommandExecutor = executorDfa.getPropertyValue("executor");
DirectFieldAccessor dfa = new DirectFieldAccessor(custerCommandExecutor);
clusterCommandExecutor.setMaxRedirects((Integer) dfa.getPropertyValue("maxRedirects"));
} catch (Exception e) {
// ignore it and work with the executor default
}
}
/**
* Create new {@link JedisClusterConnection} utilizing native connections via {@link JedisCluster} running commands
* across the cluster via given {@link ClusterCommandExecutor}. Uses {@link JedisClusterTopologyProvider} by default.
*
* @param cluster must not be {@literal null}.
* @param executor must not be {@literal null}.
*/
public JedisClusterConnection(JedisCluster cluster, ClusterCommandExecutor executor) {
this(cluster, executor, new JedisClusterTopologyProvider(cluster));
}
/**
* Create new {@link JedisClusterConnection} utilizing native connections via {@link JedisCluster} running commands
* across the cluster via given {@link ClusterCommandExecutor} and using the given {@link ClusterTopologyProvider}.
*
* @param cluster must not be {@literal null}.
* @param executor must not be {@literal null}.
* @param topologyProvider must not be {@literal null}.
* @since 2.2
*/
public JedisClusterConnection(JedisCluster cluster, ClusterCommandExecutor executor,
ClusterTopologyProvider topologyProvider) {
Assert.notNull(cluster, "JedisCluster must not be null");
Assert.notNull(executor, "ClusterCommandExecutor must not be null");
Assert.notNull(topologyProvider, "ClusterTopologyProvider must not be null");
this.closed = false;
this.cluster = cluster;
this.topologyProvider = topologyProvider;
this.clusterCommandExecutor = executor;
this.disposeClusterCommandExecutorOnClose = false;
}
@Nullable
@Override
public Object execute(String command, byte[]... args) {
Assert.notNull(command, "Command must not be null");
Assert.notNull(args, "Args must not be null");
return clusterCommandExecutor.executeCommandOnArbitraryNode(
(JedisClusterCommandCallback<Object>) client -> client.sendCommand(JedisClientUtils.getCommand(command), args))
.getValue();
}
@Nullable
@Override
public <T> T execute(String command, byte[] key, Collection<byte[]> args) {
Assert.notNull(command, "Command must not be null");
Assert.notNull(key, "Key must not be null");
Assert.notNull(args, "Args must not be null");
byte[][] commandArgs = getCommandArguments(key, args);
RedisClusterNode keyMaster = topologyProvider.getTopology().getKeyServingMasterNode(key);
return clusterCommandExecutor.executeCommandOnSingleNode((JedisClusterCommandCallback<T>) client -> {
return (T) client.sendCommand(JedisClientUtils.getCommand(command), commandArgs);
}, keyMaster).getValue();
}
private static byte[][] getCommandArguments(byte[] key, Collection<byte[]> args) {
byte[][] commandArgs = new byte[args.size() + 1][];
commandArgs[0] = key;
int targetIndex = 1;
for (byte[] binaryArgument : args) {
commandArgs[targetIndex++] = binaryArgument;
}
return commandArgs;
}
/**
* Execute the given command for each key in {@code keys} provided appending all {@code args} on each invocation.
* <br />
* This method, other than {@link #execute(String, byte[]...)}, dispatches the command to the {@code key} serving
* master node and appends the {@code key} as first command argument to the {@code command}. {@code keys} are not
* required to share the same slot for single-key commands. Multi-key commands carrying their keys in {@code args}
* still require to share the same slot as the {@code key}.
*
* <pre>
* <code>
* // SET foo bar EX 10 NX
* execute("SET", "foo".getBytes(), asBinaryList("bar", "EX", 10, "NX"))
* </code>
* </pre>
*
* @param command must not be {@literal null}.
* @param keys must not be {@literal null}.
* @param args must not be {@literal null}.
* @return command result as delivered by the underlying Redis driver. Can be {@literal null}.
* @since 2.1
*/
@Nullable
public <T> List<T> execute(String command, Collection<byte[]> keys, Collection<byte[]> args) {
Assert.notNull(command, "Command must not be null");
Assert.notNull(keys, "Key must not be null");
Assert.notNull(args, "Args must not be null");
return clusterCommandExecutor.executeMultiKeyCommand((JedisMultiKeyClusterCommandCallback<T>) (client, key) -> {
return (T) client.sendCommand(JedisClientUtils.getCommand(command), getCommandArguments(key, args));
}, keys).resultsAsList();
}
@Override
public RedisCommands commands() {
return this;
}
@Override
public RedisClusterCommands clusterCommands() {
return this;
}
@Override
public RedisGeoCommands geoCommands() {
return geoCommands;
}
@Override
public RedisHashCommands hashCommands() {
return hashCommands;
}
@Override
public RedisHyperLogLogCommands hyperLogLogCommands() {
return hllCommands;
}
@Override
public RedisKeyCommands keyCommands() {
return keyCommands;
}
@Override
public RedisListCommands listCommands() {
return listCommands;
}
@Override
public RedisSetCommands setCommands() {
return setCommands;
}
@Override
public RedisClusterServerCommands serverCommands() {
return serverCommands;
}
@Override
public RedisStreamCommands streamCommands() {
return streamCommands;
}
@Override
public RedisStringCommands stringCommands() {
return stringCommands;
}
@Override
public RedisZSetCommands zSetCommands() {
return zSetCommands;
}
@Override
public RedisScriptingCommands scriptingCommands() {
return new JedisClusterScriptingCommands(this);
}
@Override
public Set<byte[]> keys(RedisClusterNode node, byte[] pattern) {
return keyCommands.keys(node, pattern);
}
@Override
public Cursor<byte[]> scan(RedisClusterNode node, ScanOptions options) {
return keyCommands.scan(node, options);
}
@Override
public byte[] randomKey(RedisClusterNode node) {
return keyCommands.randomKey(node);
}
@Override
public void multi() {
throw new InvalidDataAccessApiUsageException("MULTI is currently not supported in cluster mode");
}
@Override
public List<Object> exec() {
throw new InvalidDataAccessApiUsageException("EXEC is currently not supported in cluster mode");
}
@Override
public void discard() {
throw new InvalidDataAccessApiUsageException("DISCARD is currently not supported in cluster mode");
}
@Override
public void watch(byte[]... keys) {
throw new InvalidDataAccessApiUsageException("WATCH is currently not supported in cluster mode");
}
@Override
public void unwatch() {
throw new InvalidDataAccessApiUsageException("UNWATCH is currently not supported in cluster mode");
}
@Override
public boolean isSubscribed() {
return (subscription != null && subscription.isAlive());
}
@Override
public Subscription getSubscription() {
return subscription;
}
@Override
public Long publish(byte[] channel, byte[] message) {
try {
return cluster.publish(channel, message);
} catch (Exception ex) {
throw convertJedisAccessException(ex);
}
}
@Override
public void subscribe(MessageListener listener, byte[]... channels) {
if (isSubscribed()) {
throw new RedisSubscribedConnectionException(
"Connection already subscribed; use the connection Subscription to cancel or add new channels");
}
try {
JedisMessageListener jedisPubSub = new JedisMessageListener(listener);
subscription = new JedisSubscription(listener, jedisPubSub, channels, null);
cluster.subscribe(jedisPubSub, channels);
} catch (Exception ex) {
throw convertJedisAccessException(ex);
}
}
@Override
public void pSubscribe(MessageListener listener, byte[]... patterns) {
if (isSubscribed()) {
throw new RedisSubscribedConnectionException(
"Connection already subscribed; use the connection Subscription to cancel or add new channels");
}
try {
JedisMessageListener jedisPubSub = new JedisMessageListener(listener);
subscription = new JedisSubscription(listener, jedisPubSub, null, patterns);
cluster.psubscribe(jedisPubSub, patterns);
} catch (Exception ex) {
throw convertJedisAccessException(ex);
}
}
@Override
public void select(int dbIndex) {
if (dbIndex != 0) {
throw new InvalidDataAccessApiUsageException("Cannot SELECT non zero index in cluster mode");
}
}
@Override
public byte[] echo(byte[] message) {
throw new InvalidDataAccessApiUsageException("Echo not supported in cluster mode");
}
@Override
public String ping() {
return !clusterCommandExecutor.executeCommandOnAllNodes((JedisClusterCommandCallback<String>) Jedis::ping)
.resultsAsList().isEmpty() ? "PONG" : null;
}
@Override
public String ping(RedisClusterNode node) {
return clusterCommandExecutor.executeCommandOnSingleNode((JedisClusterCommandCallback<String>) Jedis::ping, node)
.getValue();
}
/*
* --> Cluster Commands
*/
@Override
public void clusterSetSlot(RedisClusterNode node, int slot, AddSlots mode) {
Assert.notNull(node, "Node must not be null");
Assert.notNull(mode, "AddSlots mode must not be null");
RedisClusterNode nodeToUse = topologyProvider.getTopology().lookup(node);
String nodeId = nodeToUse.getId();
clusterCommandExecutor.executeCommandOnSingleNode((JedisClusterCommandCallback<String>) client -> {
switch (mode) {
case IMPORTING:
return client.clusterSetSlotImporting(slot, nodeId);
case MIGRATING:
return client.clusterSetSlotMigrating(slot, nodeId);
case STABLE:
return client.clusterSetSlotStable(slot);
case NODE:
return client.clusterSetSlotNode(slot, nodeId);
}
throw new IllegalArgumentException(String.format("Unknown AddSlots mode '%s'", mode));
}, node);
}
@Override
public List<byte[]> clusterGetKeysInSlot(int slot, Integer count) {
RedisClusterNode node = clusterGetNodeForSlot(slot);
NodeResult<List<byte[]>> result = clusterCommandExecutor
.executeCommandOnSingleNode(
(JedisClusterCommandCallback<List<byte[]>>) client -> JedisConverters.stringListToByteList()
.convert(client.clusterGetKeysInSlot(slot, count != null ? count.intValue() : Integer.MAX_VALUE)),
node);
return result.getValue();
}
@Override
public void clusterAddSlots(RedisClusterNode node, int... slots) {
clusterCommandExecutor.executeCommandOnSingleNode(
(JedisClusterCommandCallback<String>) client -> client.clusterAddSlots(slots), node);
}
@Override
public void clusterAddSlots(RedisClusterNode node, SlotRange range) {
Assert.notNull(range, "Range must not be null");
clusterAddSlots(node, range.getSlotsArray());
}
@Override
public Long clusterCountKeysInSlot(int slot) {
RedisClusterNode node = clusterGetNodeForSlot(slot);
return clusterCommandExecutor.executeCommandOnSingleNode(
(JedisClusterCommandCallback<Long>) client -> client.clusterCountKeysInSlot(slot), node).getValue();
}
@Override
public void clusterDeleteSlots(RedisClusterNode node, int... slots) {
clusterCommandExecutor.executeCommandOnSingleNode(
(JedisClusterCommandCallback<String>) client -> client.clusterDelSlots(slots), node);
}
@Override
public void clusterDeleteSlotsInRange(RedisClusterNode node, SlotRange range) {
Assert.notNull(range, "Range must not be null");
clusterDeleteSlots(node, range.getSlotsArray());
}
@Override
public void clusterForget(RedisClusterNode node) {
Set<RedisClusterNode> nodes = new LinkedHashSet<>(topologyProvider.getTopology().getActiveMasterNodes());
RedisClusterNode nodeToRemove = topologyProvider.getTopology().lookup(node);
nodes.remove(nodeToRemove);
clusterCommandExecutor.executeCommandAsyncOnNodes(
(JedisClusterCommandCallback<String>) client -> client.clusterForget(node.getId()), nodes);
}
@Override
public void clusterMeet(RedisClusterNode node) {
Assert.notNull(node, "Cluster node must not be null for CLUSTER MEET command");
Assert.hasText(node.getHost(), "Node to meet cluster must have a host");
Assert.isTrue(node.getPort() > 0, "Node to meet cluster must have a port greater 0");
clusterCommandExecutor.executeCommandOnAllNodes(
(JedisClusterCommandCallback<String>) client -> client.clusterMeet(node.getHost(), node.getPort()));
}
@Override
public void clusterReplicate(RedisClusterNode master, RedisClusterNode replica) {
RedisClusterNode masterNode = topologyProvider.getTopology().lookup(master);
clusterCommandExecutor.executeCommandOnSingleNode(
(JedisClusterCommandCallback<String>) client -> client.clusterReplicate(masterNode.getId()), replica);
}
@Override
public Integer clusterGetSlotForKey(byte[] key) {
return clusterCommandExecutor
.executeCommandOnArbitraryNode(
(JedisClusterCommandCallback<Integer>) client -> (int) client.clusterKeySlot(JedisConverters.toString(key)))
.getValue();
}
@Override
public RedisClusterNode clusterGetNodeForKey(byte[] key) {
return topologyProvider.getTopology().getKeyServingMasterNode(key);
}
@Override
public RedisClusterNode clusterGetNodeForSlot(int slot) {
for (RedisClusterNode node : topologyProvider.getTopology().getSlotServingNodes(slot)) {
if (node.isMaster()) {
return node;
}
}
return null;
}
@Override
public Set<RedisClusterNode> clusterGetNodes() {
return topologyProvider.getTopology().getNodes();
}
@Override
public Set<RedisClusterNode> clusterGetReplicas(RedisClusterNode master) {
Assert.notNull(master, "Master cannot be null");
RedisClusterNode nodeToUse = topologyProvider.getTopology().lookup(master);
return JedisConverters.toSetOfRedisClusterNodes(clusterCommandExecutor
.executeCommandOnSingleNode(
(JedisClusterCommandCallback<List<String>>) client -> client.clusterSlaves(nodeToUse.getId()), master)
.getValue());
}
@Override
public Map<RedisClusterNode, Collection<RedisClusterNode>> clusterGetMasterReplicaMap() {
List<NodeResult<Collection<RedisClusterNode>>> nodeResults = clusterCommandExecutor.executeCommandAsyncOnNodes(
(JedisClusterCommandCallback<Collection<RedisClusterNode>>) client -> JedisConverters
.toSetOfRedisClusterNodes(client.clusterSlaves(client.clusterMyId())),
topologyProvider.getTopology().getActiveMasterNodes()).getResults();
Map<RedisClusterNode, Collection<RedisClusterNode>> result = new LinkedHashMap<>();
for (NodeResult<Collection<RedisClusterNode>> nodeResult : nodeResults) {
result.put(nodeResult.getNode(), nodeResult.getValue());
}
return result;
}
@Override
public ClusterInfo clusterGetClusterInfo() {
return new ClusterInfo(JedisConverters.toProperties(clusterCommandExecutor
.executeCommandOnArbitraryNode((JedisClusterCommandCallback<String>) Jedis::clusterInfo).getValue()));
}
/*
* --> Little helpers to make it work
*/
protected DataAccessException convertJedisAccessException(Exception ex) {
DataAccessException translated = EXCEPTION_TRANSLATION.translate(ex);
return translated != null ? translated : new RedisSystemException(ex.getMessage(), ex);
}
@Override
public void close() throws DataAccessException {
if (!closed && disposeClusterCommandExecutorOnClose) {
try {
clusterCommandExecutor.destroy();
} catch (Exception ex) {
log.warn("Cannot properly close cluster command executor", ex);
}
}
closed = true;
}
@Override
public boolean isClosed() {
return closed;
}
@Override
public JedisCluster getNativeConnection() {
return cluster;
}
@Override
public boolean isQueueing() {
return false;
}
@Override
public boolean isPipelined() {
return false;
}
@Override
public void openPipeline() {
throw new InvalidDataAccessApiUsageException("Pipeline is not supported for JedisClusterConnection");
}
@Override
public List<Object> closePipeline() throws RedisPipelineException {
throw new InvalidDataAccessApiUsageException("Pipeline is not supported for JedisClusterConnection");
}
@Override
public RedisSentinelConnection getSentinelConnection() {
throw new InvalidDataAccessApiUsageException("Sentinel is not supported for JedisClusterConnection");
}
@Override
public void rewriteConfig() {
serverCommands().rewriteConfig();
}
/**
* {@link Jedis} specific {@link ClusterCommandCallback}.
*
* @author Christoph Strobl
* @param <T>
* @since 1.7
*/
protected interface JedisClusterCommandCallback<T> extends ClusterCommandCallback<Jedis, T> {}
/**
* {@link Jedis} specific {@link MultiKeyClusterCommandCallback}.
*
* @author Christoph Strobl
* @param <T>
* @since 1.7
*/
protected interface JedisMultiKeyClusterCommandCallback<T> extends MultiKeyClusterCommandCallback<Jedis, T> {}
/**
* Jedis specific implementation of {@link ClusterNodeResourceProvider}.
*
* @author Christoph Strobl
* @author Mark Paluch
* @since 1.7
*/
static class JedisClusterNodeResourceProvider implements ClusterNodeResourceProvider {
private final JedisCluster cluster;
private final ClusterTopologyProvider topologyProvider;
private final ClusterConnectionProvider connectionHandler;
/**
* Creates new {@link JedisClusterNodeResourceProvider}.
*
* @param cluster must not be {@literal null}.
* @param topologyProvider must not be {@literal null}.
*/
JedisClusterNodeResourceProvider(JedisCluster cluster, ClusterTopologyProvider topologyProvider) {
this.cluster = cluster;
this.topologyProvider = topologyProvider;
if (cluster != null) {
PropertyAccessor accessor = new DirectFieldAccessFallbackBeanWrapper(cluster);
this.connectionHandler = accessor.isReadableProperty("connectionHandler")
? (ClusterConnectionProvider) accessor.getPropertyValue("connectionHandler")
: null;
} else {
this.connectionHandler = null;
}
}
@Override
@SuppressWarnings("unchecked")
public Jedis getResourceForSpecificNode(RedisClusterNode node) {
Assert.notNull(node, "Cannot get Pool for 'null' node");
ConnectionPool pool = getResourcePoolForSpecificNode(node);
if (pool != null) {
return new Jedis(pool.getResource());
}
Connection connection = getConnectionForSpecificNode(node);
if (connection != null) {
return new Jedis(connection);
}
throw new DataAccessResourceFailureException(String.format("Node %s is unknown to cluster", node));
}
private ConnectionPool getResourcePoolForSpecificNode(RedisClusterNode node) {
Map<String, ConnectionPool> clusterNodes = cluster.getClusterNodes();
if (clusterNodes.containsKey(node.asString())) {
return clusterNodes.get(node.asString());
}
return null;
}
private Connection getConnectionForSpecificNode(RedisClusterNode node) {
RedisClusterNode member = topologyProvider.getTopology().lookup(node);
if (!member.hasValidHost()) {
throw new DataAccessResourceFailureException(String
.format("Cannot obtain connection to node %ss as it is not associated with a hostname", node.getId()));
}
if (member != null && connectionHandler != null) {
return connectionHandler.getConnection(new HostAndPort(member.getHost(), member.getPort()));
}
return null;
}
@Override
public void returnResourceForSpecificNode(RedisClusterNode node, Object client) {
((Jedis) client).close();
}
}
/**
* Jedis specific implementation of {@link ClusterTopologyProvider}.
*
* @author Christoph Strobl
* @author Mark Paluch
* @since 1.7
*/
public static class JedisClusterTopologyProvider implements ClusterTopologyProvider {
private final Object lock = new Object();
private final JedisCluster cluster;
private final long cacheTimeMs;
private long time = 0;
private @Nullable ClusterTopology cached;
/**
* Create new {@link JedisClusterTopologyProvider}. Uses a default cache timeout of 100 milliseconds.
*
* @param cluster must not be {@literal null}.
*/
public JedisClusterTopologyProvider(JedisCluster cluster) {
this(cluster, Duration.ofMillis(100));
}
/**
* Create new {@link JedisClusterTopologyProvider}.
*
* @param cluster must not be {@literal null}.
* @param cacheTimeout must not be {@literal null}.
* @since 2.2
*/
public JedisClusterTopologyProvider(JedisCluster cluster, Duration cacheTimeout) {
Assert.notNull(cluster, "JedisCluster must not be null");
Assert.notNull(cacheTimeout, "Cache timeout must not be null");
Assert.isTrue(!cacheTimeout.isNegative(), "Cache timeout must not be negative");
this.cluster = cluster;
this.cacheTimeMs = cacheTimeout.toMillis();
}
@Override
public ClusterTopology getTopology() {
if (cached != null && shouldUseCachedValue()) {
return cached;
}
Map<String, Exception> errors = new LinkedHashMap<>();
List<Entry<String, ConnectionPool>> list = new ArrayList<>(cluster.getClusterNodes().entrySet());
Collections.shuffle(list);
for (Entry<String, ConnectionPool> entry : list) {
try (Connection connection = entry.getValue().getResource()) {
time = System.currentTimeMillis();
Set<RedisClusterNode> nodes = Converters.toSetOfRedisClusterNodes(new Jedis(connection).clusterNodes());
synchronized (lock) {
cached = new ClusterTopology(nodes);
}
return cached;
} catch (Exception ex) {
errors.put(entry.getKey(), ex);
}
}
StringBuilder sb = new StringBuilder();
for (Entry<String, Exception> entry : errors.entrySet()) {
sb.append(String.format("\r\n\t- %s failed: %s", entry.getKey(), entry.getValue().getMessage()));
}
throw new ClusterStateFailureException(
"Could not retrieve cluster information; CLUSTER NODES returned with error" + sb.toString());
}
/**
* Returns whether {@link #getTopology()} should return the cached {@link ClusterTopology}. Uses a time-based
* caching.
*
* @return {@literal true} to use the cached {@link ClusterTopology}; {@literal false} to fetch a new cluster
* topology.
* @see #JedisClusterTopologyProvider(JedisCluster, Duration)
* @since 2.2
*/
protected boolean shouldUseCachedValue() {
return time + cacheTimeMs > System.currentTimeMillis();
}
}
protected JedisCluster getCluster() {
return cluster;
}
protected ClusterCommandExecutor getClusterCommandExecutor() {
return clusterCommandExecutor;
}
protected ClusterTopologyProvider getTopologyProvider() {
return topologyProvider;
}
}
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