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Redis Java client with features of In-Memory Data Grid
/**
* Copyright (c) 2013-2022 Nikita Koksharov
*
* 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
*
* 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.redisson.connection.balancer;
import org.redisson.api.NodeType;
import org.redisson.client.RedisClient;
import org.redisson.client.RedisConnection;
import org.redisson.client.RedisConnectionException;
import org.redisson.client.RedisPubSubConnection;
import org.redisson.client.protocol.RedisCommand;
import org.redisson.config.MasterSlaveServersConfig;
import org.redisson.config.ReadMode;
import org.redisson.connection.ClientConnectionsEntry;
import org.redisson.connection.ClientConnectionsEntry.FreezeReason;
import org.redisson.connection.ConnectionManager;
import org.redisson.connection.MasterSlaveEntry;
import org.redisson.connection.pool.PubSubConnectionPool;
import org.redisson.connection.pool.SlaveConnectionPool;
import org.redisson.misc.RedisURI;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.net.InetSocketAddress;
import java.util.*;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;
/**
*
* @author Nikita Koksharov
*
*/
public class LoadBalancerManager {
private final Logger log = LoggerFactory.getLogger(getClass());
protected final ConnectionManager connectionManager;
protected final PubSubConnectionPool pubSubConnectionPool;
protected final SlaveConnectionPool slaveConnectionPool;
private final Map client2Entry = new ConcurrentHashMap<>();
public LoadBalancerManager(MasterSlaveServersConfig config, ConnectionManager connectionManager, MasterSlaveEntry entry) {
this.connectionManager = connectionManager;
slaveConnectionPool = new SlaveConnectionPool(config, connectionManager, entry);
pubSubConnectionPool = new PubSubConnectionPool(config, connectionManager, entry);
}
public void changeType(InetSocketAddress address, NodeType nodeType) {
ClientConnectionsEntry entry = getEntry(address);
if (entry != null) {
if (connectionManager.isClusterMode()) {
entry.getClient().getConfig().setReadOnly(nodeType == NodeType.SLAVE && connectionManager.getServiceManager().getConfig().getReadMode() != ReadMode.MASTER);
}
entry.setNodeType(nodeType);
}
}
public CompletableFuture add(ClientConnectionsEntry entry) {
CompletableFuture future = CompletableFuture.completedFuture(null);
if (!entry.isFreezed()) {
CompletableFuture slaveFuture = slaveConnectionPool.initConnections(entry);
CompletableFuture pubSubFuture = pubSubConnectionPool.initConnections(entry);
future = CompletableFuture.allOf(slaveFuture, pubSubFuture);
}
return future.thenAccept(r -> {
slaveConnectionPool.addEntry(entry);
pubSubConnectionPool.addEntry(entry);
client2Entry.put(entry.getClient(), entry);
});
}
public Collection getEntries() {
return Collections.unmodifiableCollection(client2Entry.values());
}
public int getAvailableSlaves() {
return (int) client2Entry.values().stream()
.filter(e -> !e.isFreezed() && e.getNodeType() == NodeType.SLAVE)
.count();
}
public int getAvailableClients() {
int count = 0;
for (ClientConnectionsEntry connectionEntry : client2Entry.values()) {
if (!connectionEntry.isFreezed()) {
count++;
}
}
return count;
}
public CompletableFuture unfreezeAsync(RedisURI address, FreezeReason freezeReason) {
ClientConnectionsEntry entry = getEntry(address);
if (entry == null) {
log.error("Can't find {} in slaves! Available slaves: {}", address, client2Entry.keySet());
return CompletableFuture.completedFuture(false);
}
return unfreezeAsync(entry, freezeReason);
}
public CompletableFuture unfreezeAsync(InetSocketAddress address, FreezeReason freezeReason) {
ClientConnectionsEntry entry = getEntry(address);
if (entry == null) {
log.error("Can't find {} in slaves! Available slaves: {}", address, client2Entry.keySet());
return CompletableFuture.completedFuture(false);
}
return unfreezeAsync(entry, freezeReason);
}
public CompletableFuture unfreezeAsync(ClientConnectionsEntry entry, FreezeReason freezeReason) {
return unfreezeAsync(entry, freezeReason, 0);
}
private CompletableFuture unfreezeAsync(ClientConnectionsEntry entry, FreezeReason freezeReason, int retry) {
synchronized (entry) {
if (!entry.isFreezed()) {
return CompletableFuture.completedFuture(false);
}
if (freezeReason != FreezeReason.RECONNECT
|| entry.getFreezeReason() == FreezeReason.RECONNECT) {
if (!entry.isInitialized()) {
entry.setInitialized(true);
List> futures = new ArrayList<>(2);
futures.add(slaveConnectionPool.initConnections(entry));
futures.add(pubSubConnectionPool.initConnections(entry));
CompletableFuture future = CompletableFuture.allOf(futures.toArray(new CompletableFuture[0]));
CompletableFuture f = new CompletableFuture<>();
future.whenComplete((r, e) -> {
if (e != null) {
int maxAttempts = connectionManager.getServiceManager().getConfig().getRetryAttempts();
int retryInterval = connectionManager.getServiceManager().getConfig().getRetryInterval();
log.error("Unable to unfreeze entry: {} attempt: {} of {}", entry, retry, maxAttempts, e);
entry.setInitialized(false);
if (retry < maxAttempts) {
connectionManager.getServiceManager().newTimeout(t -> {
CompletableFuture ff = unfreezeAsync(entry, freezeReason, retry + 1);
connectionManager.getServiceManager().transfer(ff, f);
}, retryInterval, TimeUnit.MILLISECONDS);
} else {
f.complete(false);
}
return;
}
entry.getClient().getConfig().getFailedNodeDetector().onConnectSuccessful();
entry.setFreezeReason(null);
log.debug("Unfreezed entry: {} after {} attempts", entry, retry);
f.complete(true);
});
return f;
}
}
}
return CompletableFuture.completedFuture(false);
}
public ClientConnectionsEntry freeze(RedisURI address, FreezeReason freezeReason) {
ClientConnectionsEntry connectionEntry = getEntry(address);
return freeze(connectionEntry, freezeReason);
}
public ClientConnectionsEntry freeze(InetSocketAddress address, FreezeReason freezeReason) {
ClientConnectionsEntry connectionEntry = getEntry(address);
return freeze(connectionEntry, freezeReason);
}
@SuppressWarnings("BooleanExpressionComplexity")
public ClientConnectionsEntry freeze(ClientConnectionsEntry connectionEntry, FreezeReason freezeReason) {
if (connectionEntry == null || (connectionEntry.getClient().getConfig().getFailedNodeDetector().isNodeFailed()
&& connectionEntry.getFreezeReason() == FreezeReason.RECONNECT
&& freezeReason == FreezeReason.RECONNECT)) {
return null;
}
synchronized (connectionEntry) {
if (connectionEntry.isFreezed()) {
return null;
}
// only RECONNECT freeze reason could be replaced
if (connectionEntry.getFreezeReason() == null
|| connectionEntry.getFreezeReason() == FreezeReason.RECONNECT
|| (freezeReason == FreezeReason.MANAGER
&& connectionEntry.getFreezeReason() != FreezeReason.MANAGER
&& connectionEntry.getNodeType() == NodeType.SLAVE)) {
connectionEntry.setFreezeReason(freezeReason);
return connectionEntry;
}
}
return connectionEntry;
}
public CompletableFuture nextPubSubConnection() {
return pubSubConnectionPool.get();
}
public CompletableFuture nextPubSubConnection(ClientConnectionsEntry entry) {
return pubSubConnectionPool.get(entry);
}
public boolean contains(InetSocketAddress addr) {
return getEntry(addr) != null;
}
public boolean contains(RedisURI addr) {
return getEntry(addr) != null;
}
public boolean contains(RedisClient redisClient) {
return getEntry(redisClient) != null;
}
public ClientConnectionsEntry getEntry(RedisURI addr) {
for (ClientConnectionsEntry entry : client2Entry.values()) {
InetSocketAddress entryAddr = entry.getClient().getAddr();
if (addr.equals(entryAddr)) {
return entry;
}
}
return null;
}
private ClientConnectionsEntry getEntry(InetSocketAddress address) {
for (ClientConnectionsEntry entry : client2Entry.values()) {
InetSocketAddress addr = entry.getClient().getAddr();
if (addr.getAddress().equals(address.getAddress()) && addr.getPort() == address.getPort()) {
return entry;
}
}
return null;
}
public ClientConnectionsEntry getEntry(RedisClient redisClient) {
return client2Entry.get(redisClient);
}
public CompletableFuture getConnection(RedisCommand command, RedisURI addr) {
ClientConnectionsEntry entry = getEntry(addr);
if (entry != null) {
return slaveConnectionPool.get(command, entry);
}
RedisConnectionException exception = new RedisConnectionException("Can't find entry for " + addr);
CompletableFuture f = new CompletableFuture<>();
f.completeExceptionally(exception);
return f;
}
public CompletableFuture getConnection(RedisCommand command, RedisClient client) {
ClientConnectionsEntry entry = getEntry(client);
if (entry != null) {
return slaveConnectionPool.get(command, entry);
}
RedisConnectionException exception = new RedisConnectionException("Can't find entry for " + client);
CompletableFuture f = new CompletableFuture<>();
f.completeExceptionally(exception);
return f;
}
public CompletableFuture nextConnection(RedisCommand command) {
return slaveConnectionPool.get(command);
}
public void returnPubSubConnection(RedisPubSubConnection connection) {
ClientConnectionsEntry entry = getEntry(connection.getRedisClient());
pubSubConnectionPool.returnConnection(entry, connection);
}
public void returnConnection(RedisConnection connection) {
ClientConnectionsEntry entry = getEntry(connection.getRedisClient());
slaveConnectionPool.returnConnection(entry, connection);
}
public CompletableFuture shutdownAsync() {
if (client2Entry.values().isEmpty()) {
return CompletableFuture.completedFuture(null);
}
List> futures = new ArrayList<>();
for (ClientConnectionsEntry entry : client2Entry.values()) {
futures.add(entry.shutdownAsync());
}
return CompletableFuture.allOf(futures.toArray(new CompletableFuture[0]));
}
}