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Easy Redis Java client and Real-Time Data Platform. Valkey compatible. Sync/Async/RxJava3/Reactive API. Client side caching. Over 50 Redis based Java objects and services: JCache API, Apache Tomcat, Hibernate, Spring, Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Scheduler, RPC
/**
* Copyright (c) 2013-2024 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.client.handler;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import org.redisson.api.RFuture;
import org.redisson.client.RedisClientConfig;
import org.redisson.client.RedisConnection;
import org.redisson.client.RedisRetryException;
import org.redisson.client.codec.StringCodec;
import org.redisson.client.protocol.QueueCommand;
import org.redisson.client.protocol.RedisCommands;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.CancellationException;
import java.util.concurrent.CompletionException;
import java.util.concurrent.TimeUnit;
/**
*
* @author Nikita Koksharov
*
*/
@Sharable
public class PingConnectionHandler extends ChannelInboundHandlerAdapter {
private static final Logger log = LoggerFactory.getLogger(PingConnectionHandler.class);
private final RedisClientConfig config;
public PingConnectionHandler(RedisClientConfig config) {
this.config = config;
}
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
RedisConnection connection = RedisConnection.getFrom(ctx.channel());
connection.getConnectionPromise().whenComplete((res, e) -> {
if (e == null) {
sendPing(ctx);
}
});
ctx.fireChannelActive();
}
private void sendPing(ChannelHandlerContext ctx) {
RedisConnection connection = RedisConnection.getFrom(ctx.channel());
if (isClosed(ctx, connection)) {
return;
}
RFuture future;
QueueCommand currentCommand = connection.getCurrentCommandData();
if (connection.getUsage() == 0 && (currentCommand == null || !currentCommand.isBlockingCommand())) {
int timeout = Math.max(config.getCommandTimeout(), config.getPingConnectionInterval() / 2);
future = connection.async(timeout, StringCodec.INSTANCE, RedisCommands.PING);
} else {
future = null;
}
config.getTimer().newTimeout(timeout -> {
if (isClosed(ctx, connection)) {
return;
}
QueueCommand cd = connection.getCurrentCommandData();
if (cd != null && cd.isBlockingCommand()) {
sendPing(ctx);
return;
}
if (connection.getUsage() == 0
&& future != null
&& (future.cancel(false) || cause(future) != null)) {
Throwable cause = cause(future);
if (!(cause instanceof RedisRetryException)) {
if (!future.isCancelled()) {
log.error("Unable to send PING command over channel: {}", ctx.channel(), cause);
}
log.debug("channel: {} closed due to PING response timeout set in {} ms", ctx.channel(), config.getPingConnectionInterval());
ctx.channel().close();
connection.getRedisClient().getConfig().getFailedNodeDetector().onPingFailed();
} else {
connection.getRedisClient().getConfig().getFailedNodeDetector().onPingSuccessful();
sendPing(ctx);
}
} else {
connection.getRedisClient().getConfig().getFailedNodeDetector().onPingSuccessful();
sendPing(ctx);
}
}, config.getPingConnectionInterval(), TimeUnit.MILLISECONDS);
}
private static boolean isClosed(ChannelHandlerContext ctx, RedisConnection connection) {
return connection.isClosed()
|| ctx.isRemoved()
|| connection.getRedisClient().isShutdown();
}
protected Throwable cause(RFuture> future) {
try {
future.toCompletableFuture().getNow(null);
return null;
} catch (CompletionException ex2) {
return ex2.getCause();
} catch (CancellationException ex1) {
return ex1;
}
}
}
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