/*
* 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.
*/
package io.undertow.util;
import org.xnio.channels.StreamSourceChannel;
import org.xnio.conduits.AbstractStreamSinkConduit;
import org.xnio.conduits.StreamSinkConduit;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
/**
* A channel that will only write a single byte at a time for a set number of calls to write.
*
* This can be used for testing purposes, to make sure that resuming writes works as expected.
*
* @author Stuart Douglas
*/
public class SingleByteStreamSinkConduit extends AbstractStreamSinkConduit<StreamSinkConduit> {
private final int singleByteWrites;
private int state = 0;
/**
* Construct a new instance.
*
* @param next the delegate conduit to set
* @param singleByteWrites
*/
public SingleByteStreamSinkConduit(StreamSinkConduit next, int singleByteWrites) {
super(next);
this.singleByteWrites = singleByteWrites;
}
@Override
public int write(ByteBuffer src) throws IOException {
if (state > singleByteWrites) {
return next.write(src);
}
if (state++ % 2 == 0) {
return 0;
} else {
if (src.remaining() == 0) {
return 0;
}
int limit = src.limit();
try {
src.limit(src.position() + 1);
return next.write(src);
} finally {
src.limit(limit);
}
}
}
@Override
public long write(ByteBuffer[] srcs, int offs, int len) throws IOException {
if (state > singleByteWrites) {
return next.write(srcs, offs, len);
}
if (state++ % 2 == 0) {
return 0;
} else {
ByteBuffer src = null;
for(int i = offs; i < offs + len; ++i) {
if(srcs[i].hasRemaining()) {
src = srcs[i];
break;
}
}
if(src == null) {
return 0;
}
int limit = src.limit();
try {
src.limit(src.position() + 1);
return next.write(src);
} finally {
src.limit(limit);
}
}
}
@Override
public long transferFrom(FileChannel src, long position, long count) throws IOException {
if (state > singleByteWrites) {
return next.transferFrom(src, position, count);
}
if (state++ % 2 == 0) {
return 0;
} else {
return next.transferFrom(src, position, count == 0 ? 0 : 1);
}
}
@Override
public long transferFrom(StreamSourceChannel source, long count, ByteBuffer throughBuffer) throws IOException {
if (state > singleByteWrites) {
return next.transferFrom(source, count, throughBuffer);
}
if (state++ % 2 == 0) {
throughBuffer.limit(throughBuffer.position());
return 0;
} else {
return next.transferFrom(source, count == 0 ? 0 : 1, throughBuffer);
}
}
}