io.undertow.conduits.FinishableStreamSourceConduit Maven / Gradle / Ivy
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* 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.conduits;
import org.xnio.channels.StreamSinkChannel;
import org.xnio.conduits.AbstractStreamSourceConduit;
import org.xnio.conduits.StreamSourceConduit;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
/**
* A conduit that calls a finish listener when there is no data left in the underlying conduit.
*
* @author Stuart Douglas
*/
public final class FinishableStreamSourceConduit extends AbstractStreamSourceConduit {
private final ConduitListener finishListener;
private boolean finishCalled = false;
public FinishableStreamSourceConduit(final StreamSourceConduit next, final ConduitListener finishListener) {
super(next);
this.finishListener = finishListener;
}
public long transferTo(final long position, final long count, final FileChannel target) throws IOException {
long res = 0;
try {
return res = next.transferTo(position, count, target);
} finally {
exitRead(res);
}
}
public long transferTo(final long count, final ByteBuffer throughBuffer, final StreamSinkChannel target) throws IOException {
long res = 0;
try {
return res = next.transferTo(count, throughBuffer, target);
} finally {
exitRead(res);
}
}
public long read(final ByteBuffer[] dsts, final int offset, final int length) throws IOException {
long res = 0;
try {
return res = next.read(dsts, offset, length);
} finally {
exitRead(res);
}
}
public int read(final ByteBuffer dst) throws IOException {
int res = 0;
try {
return res = next.read(dst);
} finally {
exitRead(res);
}
}
/**
* Exit a read method.
*
* @param consumed the number of bytes consumed by this call (may be 0)
*/
private void exitRead(long consumed) {
if (consumed == -1) {
if (!finishCalled) {
finishCalled = true;
finishListener.handleEvent(this);
}
}
}
}