org.xnio.channels.FixedLengthStreamSinkChannel 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).
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/*
* JBoss, Home of Professional Open Source.
* Copyright 2012 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 org.xnio.channels;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.FileChannel;
import java.util.concurrent.TimeUnit;
import org.xnio.ChannelListener;
import org.xnio.ChannelListeners;
import org.xnio.Option;
import org.xnio.XnioExecutor;
import org.xnio.XnioIoThread;
import org.xnio.XnioWorker;
import static java.lang.Math.min;
import static org.xnio.Bits.*;
import static org.xnio.IoUtils.safeClose;
import static org.xnio._private.Messages.msg;
/**
* A channel which writes a fixed amount of data. A listener is called once the data has been written.
*
* @author David M. Lloyd
*/
public final class FixedLengthStreamSinkChannel implements StreamSinkChannel, ProtectedWrappedChannel, WriteListenerSettable, CloseListenerSettable {
private final StreamSinkChannel delegate;
private final Object guard;
private final ChannelListener finishListener;
private ChannelListener writeListener;
private ChannelListener closeListener;
private int state;
private long count;
private static final int FLAG_CLOSE_REQUESTED = 1 << 0;
private static final int FLAG_CLOSE_COMPLETE = 1 << 1;
private static final int FLAG_CONFIGURABLE = 1 << 2;
private static final int FLAG_PASS_CLOSE = 1 << 3;
/**
* Construct a new instance.
*
* @param delegate the delegate channel
* @param contentLength the content length
* @param configurable {@code true} if this instance should pass configuration to the delegate
* @param propagateClose {@code true} if this instance should pass close to the delegate
* @param finishListener the listener to call when the channel is closed or the length is reached
* @param guard the guard object to use
*/
public FixedLengthStreamSinkChannel(final StreamSinkChannel delegate, final long contentLength, final boolean configurable, final boolean propagateClose, final ChannelListener finishListener, final Object guard) {
if (contentLength < 0L) {
throw msg.parameterOutOfRange("contentLength");
}
if (delegate == null) {
throw msg.nullParameter("delegate");
}
this.guard = guard;
this.delegate = delegate;
this.finishListener = finishListener;
state = (configurable ? FLAG_CONFIGURABLE : 0) | (propagateClose ? FLAG_PASS_CLOSE : 0);
count = contentLength;
delegate.getWriteSetter().set(new ChannelListener() {
public void handleEvent(final StreamSinkChannel channel) {
ChannelListeners.invokeChannelListener(FixedLengthStreamSinkChannel.this, writeListener);
}
});
}
public void setWriteListener(final ChannelListener listener) {
this.writeListener = listener;
}
public ChannelListener getWriteListener() {
return writeListener;
}
public void setCloseListener(final ChannelListener listener) {
this.closeListener = listener;
}
public ChannelListener getCloseListener() {
return closeListener;
}
public ChannelListener.Setter getWriteSetter() {
return new WriteListenerSettable.Setter(this);
}
public ChannelListener.Setter getCloseSetter() {
return new CloseListenerSettable.Setter(this);
}
@Override
public int writeFinal(ByteBuffer src) throws IOException {
return write(src, true);
}
@Override
public long writeFinal(ByteBuffer[] srcs, int offset, int length) throws IOException {
return write(srcs, offset, length, true);
}
@Override
public long writeFinal(ByteBuffer[] srcs) throws IOException {
return write(srcs, 0, srcs.length, true);
}
public StreamSinkChannel getChannel(final Object guard) {
final Object ourGuard = this.guard;
if (ourGuard == null || guard == ourGuard) {
return delegate;
} else {
return null;
}
}
@Deprecated
public XnioExecutor getWriteThread() {
return delegate.getWriteThread();
}
public XnioIoThread getIoThread() {
return delegate.getIoThread();
}
public XnioWorker getWorker() {
return delegate.getWorker();
}
@Override
public int write(final ByteBuffer src) throws IOException {
return write(src, false);
}
private int write(final ByteBuffer src, final boolean finalWrite) throws IOException {
if (allAreSet(state, FLAG_CLOSE_REQUESTED)) {
throw new ClosedChannelException();
}
if (! src.hasRemaining()) {
return 0;
}
int res = 0;
final long remaining = count;
if (remaining == 0L) {
throw msg.fixedOverflow();
}
try {
final int lim = src.limit();
final int pos = src.position();
if (lim - pos > remaining) {
src.limit((int) (remaining - (long) pos));
try {
return res = doWrite(src, finalWrite);
} finally {
src.limit(lim);
}
} else {
return res = doWrite(src, finalWrite);
}
} finally {
count = remaining - res;
}
}
public long write(final ByteBuffer[] srcs) throws IOException {
return write(srcs, 0, srcs.length);
}
public long write(final ByteBuffer[] srcs, final int offset, final int length) throws IOException {
return write(srcs, offset, length, false);
}
private long write(final ByteBuffer[] srcs, final int offset, final int length, boolean writeFinal) throws IOException {
if (allAreSet(state, FLAG_CLOSE_REQUESTED)) {
throw new ClosedChannelException();
}
if (length == 0) {
return 0L;
} else if (length == 1) {
return write(srcs[offset]);
}
final long remaining = count;
if (remaining == 0L) {
throw msg.fixedOverflow();
}
long res = 0L;
try {
int lim;
// The total amount of buffer space discovered so far.
long t = 0L;
for (int i = 0; i < length; i ++) {
final ByteBuffer buffer = srcs[i + offset];
// Grow the discovered buffer space by the remaining size of the current buffer.
// We want to capture the limit so we calculate "remaining" ourselves.
t += (lim = buffer.limit()) - buffer.position();
if (t > remaining) {
// only read up to this point, and trim the last buffer by the number of extra bytes
buffer.limit(lim - (int) (t - (remaining)));
try {
return res = doWrite(srcs, offset, i + 1, writeFinal);
} finally {
// restore the original limit
buffer.limit(lim);
}
}
}
if (t == 0L) {
return 0L;
}
// the total buffer space is less than the remaining count.
return res = doWrite(srcs, offset, length, writeFinal);
} finally {
count = remaining - res;
}
}
private long doWrite(ByteBuffer[] srcs, int offset, int length, final boolean writeFinal) throws IOException {
if(writeFinal) {
return delegate.writeFinal(srcs, offset, length);
}
return delegate.write(srcs, offset, length);
}
private int doWrite(ByteBuffer src, boolean finalWrite) throws IOException {
if(finalWrite) {
return delegate.writeFinal(src);
}
return delegate.write(src);
}
public long transferFrom(final FileChannel src, final long position, final long count) throws IOException {
if (allAreSet(state, FLAG_CLOSE_REQUESTED)) {
throw new ClosedChannelException();
}
if (count == 0L) return 0L;
final long remaining = this.count;
if (remaining == 0L) {
throw msg.fixedOverflow();
}
long res = 0L;
try {
return res = delegate.transferFrom(src, position, min(count, remaining));
} finally {
this.count = remaining - res;
}
}
public long transferFrom(final StreamSourceChannel source, final long count, final ByteBuffer throughBuffer) throws IOException {
if (allAreSet(state, FLAG_CLOSE_REQUESTED)) {
throw new ClosedChannelException();
}
if (count == 0L) return 0L;
final long remaining = this.count;
if (remaining == 0L) {
throw msg.fixedOverflow();
}
long res = 0L;
try {
return res = delegate.transferFrom(source, min(count, remaining), throughBuffer);
} finally {
this.count = remaining - res;
}
}
public boolean flush() throws IOException {
int state = this.state;
if (anyAreSet(state, FLAG_CLOSE_COMPLETE)) {
return true;
}
boolean flushed = false;
try {
return flushed = delegate.flush();
} finally {
if (flushed && allAreSet(state, FLAG_CLOSE_REQUESTED)) {
this.state = state | FLAG_CLOSE_COMPLETE;
callFinish();
callClosed();
if (count != 0) {
throw msg.fixedUnderflow(count);
}
}
}
}
public void suspendWrites() {
if (allAreClear(state, FLAG_CLOSE_COMPLETE)) {
delegate.suspendWrites();
}
}
public void resumeWrites() {
if (allAreClear(state, FLAG_CLOSE_COMPLETE)) {
delegate.resumeWrites();
}
}
public boolean isWriteResumed() {
return allAreClear(state, FLAG_CLOSE_COMPLETE) && delegate.isWriteResumed();
}
public void wakeupWrites() {
if (allAreClear(state, FLAG_CLOSE_COMPLETE)) {
delegate.wakeupWrites();
}
}
public void shutdownWrites() throws IOException {
final int state = this.state;
if (allAreSet(state, FLAG_CLOSE_REQUESTED)) {
return; // idempotent
}
this.state = state | FLAG_CLOSE_REQUESTED;
if (allAreSet(state, FLAG_PASS_CLOSE)) {
delegate.shutdownWrites();
}
}
public void awaitWritable() throws IOException {
delegate.awaitWritable();
}
public void awaitWritable(final long time, final TimeUnit timeUnit) throws IOException {
delegate.awaitWritable(time, timeUnit);
}
public boolean isOpen() {
return allAreClear(state, FLAG_CLOSE_REQUESTED);
}
public void close() throws IOException {
final int state = this.state;
if (allAreSet(state, FLAG_CLOSE_COMPLETE)) {
return; // idempotent
}
this.state = state | FLAG_CLOSE_REQUESTED | FLAG_CLOSE_COMPLETE;
try {
final long count = this.count;
if (count != 0) {
if (allAreSet(state, FLAG_PASS_CLOSE)) {
safeClose(delegate);
}
throw msg.fixedUnderflow(count);
}
if (allAreSet(state, FLAG_PASS_CLOSE)) {
delegate.close();
}
} finally {
callClosed();
callFinish();
}
}
public boolean supportsOption(final Option option) {
return allAreSet(state, FLAG_CONFIGURABLE) && delegate.supportsOption(option);
}
public T getOption(final Option option) throws IOException {
return allAreSet(state, FLAG_CONFIGURABLE) ? delegate.getOption(option) : null;
}
public T setOption(final Option option, final T value) throws IllegalArgumentException, IOException {
return allAreSet(state, FLAG_CONFIGURABLE) ? delegate.setOption(option, value) : null;
}
/**
* Get the number of remaining bytes in this fixed length channel.
*
* @return the number of remaining bytes
*/
public long getRemaining() {
return count;
}
private void callFinish() {
ChannelListeners.invokeChannelListener(this, finishListener);
}
private void callClosed() {
ChannelListeners.invokeChannelListener(this, closeListener);
}
}