reactor.ipc.netty.channel.PooledClientContextHandler.java Source code

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Here is the source code for reactor.ipc.netty.channel.PooledClientContextHandler.java

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/*
 * Copyright (c) 2011-2016 Pivotal Software Inc, All Rights Reserved.
 *
 * 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 reactor.ipc.netty.channel;

import java.io.IOException;
import java.util.Objects;

import io.netty.channel.Channel;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.pool.ChannelPool;
import io.netty.handler.logging.LoggingHandler;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.GenericFutureListener;
import org.reactivestreams.Publisher;
import reactor.core.publisher.DirectProcessor;
import reactor.core.publisher.MonoSink;
import reactor.ipc.netty.NettyContext;
import reactor.ipc.netty.NettyPipeline;
import reactor.ipc.netty.options.ClientOptions;
import reactor.util.Logger;
import reactor.util.Loggers;

/**
 * @param <CHANNEL> the channel type
 *
 * @author Stephane Maldini
 */
final class PooledClientContextHandler<CHANNEL extends Channel> extends ContextHandler<CHANNEL>
        implements GenericFutureListener<Future<CHANNEL>> {

    static final Logger log = Loggers.getLogger(PooledClientContextHandler.class);

    final ClientOptions clientOptions;
    final boolean secure;
    final ChannelPool pool;
    final DirectProcessor<Void> onReleaseEmitter;

    volatile boolean cancelled;

    Future<CHANNEL> f;

    PooledClientContextHandler(ChannelOperations.OnNew<CHANNEL> channelOpFactory, ClientOptions options,
            MonoSink<NettyContext> sink, LoggingHandler loggingHandler, boolean secure, ChannelPool pool) {
        super(channelOpFactory, options, sink, loggingHandler);
        this.clientOptions = options;
        this.secure = secure;
        this.pool = pool;
        this.onReleaseEmitter = DirectProcessor.create();
    }

    @Override
    public void fireContextActive(NettyContext context) {
        if (!fired) {
            fired = true;
            sink.success(context);
        }
    }

    @Override
    @SuppressWarnings("unchecked")
    public void setFuture(Future<?> future) {
        Objects.requireNonNull(future, "future");
        if (this.f != null) {
            future.cancel(true);
            return;
        }
        if (log.isDebugEnabled()) {
            log.debug("Acquiring existing channel from pool: {}", pool.toString());
        }
        this.f = (Future<CHANNEL>) future;
        f.addListener(this);
    }

    @Override
    public void operationComplete(Future<CHANNEL> future) throws Exception {
        sink.setCancellation(this);
        if (future.isCancelled() || cancelled) {
            if (log.isDebugEnabled()) {
                log.debug("Cancelled {}", future.toString());
            }
            return;
        }
        if (!future.isSuccess()) {
            if (future.cause() != null) {
                sink.error(future.cause());
            } else {
                sink.error(new IOException("error while connecting to " + future.toString()));
            }
            return;
        }
        CHANNEL c = future.get();

        if (c.eventLoop().inEventLoop()) {
            connectOrAcquire(c);
        } else {
            c.eventLoop().execute(() -> connectOrAcquire(c));
        }
    }

    @Override
    protected Publisher<Void> onCloseOrRelease(Channel channel) {
        return onReleaseEmitter;
    }

    @SuppressWarnings("unchecked")
    final void connectOrAcquire(CHANNEL c) {
        ChannelOperationsHandler handler = (ChannelOperationsHandler) c.pipeline()
                .get(NettyPipeline.ReactiveBridge);
        if (handler == null) {
            if (log.isDebugEnabled()) {
                log.debug("Connected new channel: {}", c.toString());
            }
            doPipeline(c.pipeline());
            c.pipeline().addLast(NettyPipeline.BridgeSetup, new BridgeSetupHandler(this));
            if (c.isRegistered()) {
                c.pipeline().fireChannelRegistered();
            }
            if (c.isActive()) {
                c.pipeline().fireChannelActive();
                return;
            }
            c.pipeline().fireChannelInactive();
            if (!c.isRegistered()) {
                c.pipeline().fireChannelUnregistered();
            }
        } else {
            if (log.isDebugEnabled()) {
                log.debug("Acquired existing channel: {}", c.toString());
            }
            c.pipeline().replace(NettyPipeline.ReactiveBridge, NettyPipeline.ReactiveBridge,
                    new ChannelOperationsHandler(this));
        }
    }

    @Override
    @SuppressWarnings("unchecked")
    public void dispose() {
        if (cancelled) {
            return;
        }
        cancelled = true;
        if (!f.isDone()) {
            if (log.isDebugEnabled()) {
                log.debug("Releasing pending channel acquisition: {}", f.toString());
            }
            f.addListener(ff -> {
                if (ff.isSuccess()) {
                    release((CHANNEL) ff.get());
                }
            });
            return;
        }
        try {
            CHANNEL c = f.get();
            if (!c.isActive()) {
                release(c);
                return;
            }

            if (!c.eventLoop().inEventLoop()) {
                c.eventLoop().execute(() -> release(c));
            } else {
                release(c);
            }

        } catch (Exception e) {
            log.error("Failed releasing channel", e);
            onReleaseEmitter.onError(e);
        }
    }

    final void release(CHANNEL c) {
        if (log.isDebugEnabled()) {
            log.debug("Releasing channel: {}", c.toString());
        }

        pool.release(c).addListener(f -> {
            if (!c.isOpen()) {
                return;
            }
            Boolean attr = c.attr(CLOSE_CHANNEL).get();
            if (attr != null && attr) {
                c.close();
            } else if (f.isSuccess()) {
                onReleaseEmitter.onComplete();
            } else {
                onReleaseEmitter.onError(f.cause());
            }
        });

    }

    @Override
    protected void doDropped(Channel channel) {
        dispose();
        fireContextError(ABORTED);
    }

    @Override
    protected void doPipeline(ChannelPipeline pipeline) {
        ClientContextHandler.addSslAndLogHandlers(clientOptions, sink, loggingHandler, secure, pipeline);
        ClientContextHandler.addProxyHandler(clientOptions, pipeline);
    }
}