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/*
* Copyright (c) 2011-2014 Pivotal Software, 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 reactor.io.net;
import org.reactivestreams.Publisher;
import org.reactivestreams.Subscriber;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import reactor.Environment;
import reactor.core.Dispatcher;
import reactor.core.support.Assert;
import reactor.fn.Consumer;
import reactor.fn.Function;
import reactor.io.buffer.Buffer;
import reactor.io.codec.Codec;
import reactor.rx.Stream;
import reactor.rx.Streams;
/**
* An abstract {@link ReactorChannel} implementation that handles the basic interaction and behave as a {@link
* reactor.rx.Stream}.
*
* @author Jon Brisbin
* @author Stephane Maldini
*/
public abstract class ChannelStream extends Stream implements ReactorChannel {
protected static final Logger log = LoggerFactory.getLogger(ChannelStream.class);
private final Environment env;
private final Dispatcher eventsDispatcher;
private final Function decoder;
private final Function encoder;
private final long prefetch;
protected ChannelStream(final Environment env,
Codec codec,
long prefetch,
Dispatcher eventsDispatcher) {
Assert.notNull(eventsDispatcher, "Events Reactor cannot be null");
this.env = env;
this.prefetch = prefetch;
this.eventsDispatcher = eventsDispatcher;
if (null != codec) {
this.decoder = codec.decoder(new Consumer() {
@Override
public void accept(IN in) {
doDecoded(in);
}
});
this.encoder = codec.encoder();
} else {
this.decoder = null;
this.encoder = null;
}
}
@Override
@SuppressWarnings("unchecked")
final public Stream writeWith(final Publisher source) {
final Stream sourceStream;
if (Stream.class.isAssignableFrom(source.getClass())) {
sourceStream = ((Stream) source);
}else{
sourceStream = new Stream(){
@Override
public void subscribe(Subscriber subscriber) {
source.subscribe(subscriber);
}
@Override
public long getCapacity() {
return prefetch;
}
};
}
return new Stream() {
@Override
public void subscribe(Subscriber s) {
doSubscribeWriter(sourceStream, s);
}
};
}
/**
* Write Buffer directly to be encoded if any codec has been setup
*
* @param source the raw source to encode
*
* @return the acknowledgement publisher from {@link #writeWith(Publisher)}
*/
final public Stream writeBufferWith(Publisher source) {
Stream encodedSource = Streams.create(source).map(new Function() {
@Override
@SuppressWarnings("unchecked")
public OUT apply(Buffer data) {
if (null != encoder) {
Buffer bytes = encoder.apply((OUT) data);
return (OUT) bytes;
} else {
return (OUT) data;
}
}
});
return writeWith(encodedSource);
}
@Override
public final Environment getEnvironment() {
return env;
}
@Override
public final Dispatcher getDispatcher() {
return eventsDispatcher;
}
@Override
final public long getCapacity() {
return prefetch;
}
public final Function getDecoder() {
return decoder;
}
public final Function getEncoder() {
return encoder;
}
/**
* @return the underlying native connection/channel in use
*/
public abstract Object delegate();
protected abstract void doSubscribeWriter(Publisher writer, Subscriber postWriter);
protected abstract void doDecoded(IN in);
}