/*
* Copyright 2014 Netflix, Inc.
*
* 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 io.reactivex.netty.client;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.ssl.SslHandler;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.GenericFutureListener;
import io.reactivex.netty.channel.ObservableConnection;
import io.reactivex.netty.metrics.Clock;
import io.reactivex.netty.metrics.MetricEventsSubject;
import io.reactivex.netty.pipeline.RxRequiredConfigurator;
import rx.Subscriber;
import rx.functions.Action0;
import rx.subscriptions.Subscriptions;
/**
* A factory to create netty channels for clients.
*
* @param <I> The type of the object that is read from the channel created by this factory.
* @param <O> The type of objects that are written to the channel created by this factory.
* @author Nitesh Kant
*/
public class ClientChannelFactoryImpl<I, O> implements ClientChannelFactory<I, O> {
protected final Bootstrap clientBootstrap;
private MetricEventsSubject<ClientMetricsEvent<?>> eventsSubject;
public ClientChannelFactoryImpl(Bootstrap clientBootstrap, MetricEventsSubject<ClientMetricsEvent<?>> eventsSubject) {
this.clientBootstrap = clientBootstrap;
this.eventsSubject = eventsSubject;
}
public ClientChannelFactoryImpl(Bootstrap clientBootstrap) {
this(clientBootstrap, new MetricEventsSubject<ClientMetricsEvent<?>>());
}
@Override
public ChannelFuture connect(final Subscriber<? super ObservableConnection<I, O>> subscriber,
RxClient.ServerInfo serverInfo,
final ClientConnectionFactory<I, O,? extends ObservableConnection<I, O>> connectionFactory) {
final long startTimeMillis = Clock.newStartTimeMillis();
eventsSubject.onEvent(ClientMetricsEvent.CONNECT_START);
final ChannelFuture connectFuture = clientBootstrap.connect(serverInfo.getHost(), serverInfo.getPort());
subscriber.add(Subscriptions.create(new Action0() {
@Override
public void call() {
if (!connectFuture.isDone()) {
connectFuture.cancel(true); // Unsubscribe here means, no more connection is required. A close on connection is explicit.
}
}
}));
connectFuture.addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
try {
if (!future.isSuccess()) {
eventsSubject.onEvent(ClientMetricsEvent.CONNECT_FAILED, Clock.onEndMillis(startTimeMillis),
future.cause());
subscriber.onError(future.cause());
} else {
eventsSubject.onEvent(ClientMetricsEvent.CONNECT_SUCCESS, Clock.onEndMillis(startTimeMillis));
ChannelPipeline pipeline = future.channel().pipeline();
final ObservableConnection<I, O> newConnection = connectionFactory.newConnection(future.channel());
ChannelHandler lifecycleHandler = pipeline.get(RxRequiredConfigurator.CONN_LIFECYCLE_HANDLER_NAME);
if (null == lifecycleHandler) {
onNewConnection(newConnection, subscriber);
} else {
@SuppressWarnings("unchecked")
ConnectionLifecycleHandler<I, O> handler = (ConnectionLifecycleHandler<I, O>) lifecycleHandler;
SslHandler sslHandler = pipeline.get(SslHandler.class);
if (null == sslHandler) {
handler.setConnection(newConnection);
onNewConnection(newConnection, subscriber);
} else {
sslHandler.handshakeFuture().addListener(new GenericFutureListener<Future<? super Channel>>() {
@Override
public void operationComplete(Future<? super Channel> future) throws Exception {
onNewConnection(newConnection, subscriber);
}
});
}
}
}
} catch (Throwable throwable) {
subscriber.onError(throwable);
}
}
});
return connectFuture;
}
@Override
public void onNewConnection(ObservableConnection<I, O> newConnection,
Subscriber<? super ObservableConnection<I, O>> subscriber) {
subscriber.onNext(newConnection);
subscriber.onCompleted(); // The observer is no longer looking for any more connections.
}
@Override
public void useMetricEventsSubject(MetricEventsSubject<ClientMetricsEvent<?>> eventsSubject) {
this.eventsSubject = eventsSubject;
}
}