io.undertow.conduits.RangeStreamSinkConduit Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* 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.conduits;
import org.xnio.IoUtils;
import org.xnio.channels.StreamSourceChannel;
import org.xnio.conduits.AbstractStreamSinkConduit;
import org.xnio.conduits.ConduitWritableByteChannel;
import org.xnio.conduits.Conduits;
import org.xnio.conduits.StreamSinkConduit;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
/**
* @author Stuart Douglas
*/
public class RangeStreamSinkConduit extends AbstractStreamSinkConduit {
private final long start, end;
private final long originalResponseLength;
private long written;
public RangeStreamSinkConduit(StreamSinkConduit next, long start, long end, long originalResponseLength) {
super(next);
this.start = start;
this.end = end;
this.originalResponseLength = originalResponseLength;
}
@Override
public int write(ByteBuffer src) throws IOException {
boolean currentInclude = written >= start && written <= end;
long bytesRemaining = written < start ? start - written : written <= end ? end - written + 1 : Long.MAX_VALUE;
if (currentInclude) {
int old = src.limit();
src.limit((int) Math.min(src.position() + bytesRemaining, src.limit()));
int written;
int toConsume = 0;
try {
written = super.write(src);
this.written += written;
} finally {
if (!src.hasRemaining()) {
//we wrote everything out
src.limit(old);
if (src.hasRemaining()) {
toConsume = src.remaining();
//but there was still some data that fell outside the range, so we discard it
this.written += toConsume;
src.position(src.limit());
}
} else {
src.limit(old);
}
}
return written + toConsume;
} else {
if (src.remaining() <= bytesRemaining) {
int rem = src.remaining();
this.written += rem;
src.position(src.limit());
return rem;
} else {
this.written += bytesRemaining;
src.position((int) (src.position() + bytesRemaining));
return (int) bytesRemaining + write(src);
}
}
}
@Override
public long write(ByteBuffer[] srcs, int offs, int len) throws IOException {
long ret = 0;
//todo: a more efficent impl
for (int i = offs; i < offs + len; ++i) {
ByteBuffer buf = srcs[i];
if (buf.remaining() > 0) {
ret += write(buf);
if (buf.hasRemaining()) {
return ret;
}
}
}
return ret;
}
@Override
public long transferFrom(StreamSourceChannel source, long count, ByteBuffer throughBuffer) throws IOException {
return IoUtils.transfer(source, count, throughBuffer, new ConduitWritableByteChannel(this));
}
@Override
public long transferFrom(FileChannel src, long position, long count) throws IOException {
return src.transferTo(position, count, new ConduitWritableByteChannel(this));
}
@Override
public long writeFinal(ByteBuffer[] srcs, int offset, int length) throws IOException {
return Conduits.writeFinalBasic(this, srcs, offset, length);
}
@Override
public int writeFinal(ByteBuffer src) throws IOException {
return Conduits.writeFinalBasic(this, src);
}
}