/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2014 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * 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.
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package io.undertow.websockets.core.function;

import org.xnio.ChannelListener;
import org.xnio.Option;
import org.xnio.XnioExecutor;
import org.xnio.XnioIoThread;
import org.xnio.XnioWorker;
import org.xnio.channels.StreamSinkChannel;
import org.xnio.channels.StreamSourceChannel;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.concurrent.TimeUnit;

Author:Norman Maurer
/** * @author <a href="mailto:nmaurer@redhat.com">Norman Maurer</a> */
public class ChannelFunctionStreamSourceChannel implements StreamSourceChannel { private final StreamSourceChannel channel; private final ChannelFunction[] functions; public ChannelFunctionStreamSourceChannel(StreamSourceChannel channel, ChannelFunction... functions) { this.channel = channel; this.functions = functions; } @Override public long transferTo(long position, long count, FileChannel target) throws IOException { return channel.transferTo(position, count, new ChannelFunctionFileChannel(target, functions)); } @Override public long transferTo(long count, ByteBuffer throughBuffer, StreamSinkChannel target) throws IOException { return target.transferFrom(this, count, throughBuffer); } @Override public ChannelListener.Setter<? extends StreamSourceChannel> getReadSetter() { return channel.getReadSetter(); } @Override public ChannelListener.Setter<? extends StreamSourceChannel> getCloseSetter() { return channel.getCloseSetter(); } @Override public long read(ByteBuffer[] dsts, int offset, int length) throws IOException { long r = 0; for (int a = offset; a < length; a++) { int i = read(dsts[a]); if (i < 1) { break; } r += i; } return r; } @Override public long read(ByteBuffer[] dsts) throws IOException { long r = 0; for (ByteBuffer buf: dsts) { int i = read(buf); if (i < 1) { break; } r += i; } return r; } @Override public void suspendReads() { channel.suspendReads(); } @Override public void resumeReads() { channel.resumeReads(); } @Override public boolean isReadResumed() { return channel.isReadResumed(); } @Override public void wakeupReads() { channel.wakeupReads(); } @Override public void shutdownReads() throws IOException { channel.shutdownReads(); } @Override public void awaitReadable() throws IOException { channel.awaitReadable(); } @Override public void awaitReadable(long time, TimeUnit timeUnit) throws IOException { channel.awaitReadable(time, timeUnit); } @Override public XnioExecutor getReadThread() { return channel.getReadThread(); } @Override public int read(ByteBuffer dst) throws IOException { int position = dst.position(); int r = channel.read(dst); if (r > 0) { afterReading(dst, position, r); } return r; } @Override public XnioWorker getWorker() { return channel.getWorker(); } @Override public XnioIoThread getIoThread() { return channel.getIoThread(); } @Override public boolean supportsOption(Option<?> option) { return channel.supportsOption(option); } @Override public <T> T getOption(Option<T> option) throws IOException { return channel.getOption(option); } @Override public <T> T setOption(Option<T> option, T value) throws IOException { return channel.setOption(option, value); } private void afterReading(ByteBuffer buffer, int position, int length) throws IOException { for (ChannelFunction func: functions) { func.afterRead(buffer, position, length); } } @Override public boolean isOpen() { return channel.isOpen(); } @Override public void close() throws IOException { channel.close(); } }