/*
* 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 java.io.
IOException;
import java.nio.
ByteBuffer;
import java.nio.channels.
FileChannel;
import java.util.concurrent.
TimeUnit;
import org.xnio.
XnioIoThread;
import org.xnio.
XnioWorker;
import org.xnio.channels.
StreamSinkChannel;
import org.xnio.conduits.
ReadReadyHandler;
import org.xnio.conduits.
StreamSourceConduit;
/**
* A stream source conduit which is always empty.
*
* Temporary copy from XNIO, see https://issues.jboss.org/browse/XNIO-199
*
* @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
*/
public final class
EmptyStreamSourceConduit implements
StreamSourceConduit {
private final
XnioWorker worker;
private final
XnioIoThread readThread;
private
ReadReadyHandler readReadyHandler;
private boolean
shutdown;
private boolean
resumed;
/**
* Construct a new instance.
*
* @param readThread the read thread for this conduit
*/
public
EmptyStreamSourceConduit(final
XnioIoThread readThread) {
this.
worker =
readThread.
getWorker();
this.
readThread =
readThread;
}
public void
setReadReadyHandler(final
ReadReadyHandler handler) {
readReadyHandler =
handler;
}
public long
transferTo(final long
position, final long
count, final
FileChannel target) throws
IOException {
return 0;
}
public long
transferTo(final long
count, final
ByteBuffer throughBuffer, final
StreamSinkChannel target) throws
IOException {
resumed = false;
return -1L;
}
public int
read(final
ByteBuffer dst) throws
IOException {
resumed = false;
return -1;
}
public long
read(final
ByteBuffer[]
dsts, final int
offs, final int
len) throws
IOException {
resumed = false;
return -1L;
}
public boolean
isReadShutdown() {
return
shutdown;
}
public void
resumeReads() {
resumed = true;
readThread.
execute(new
Runnable() {
public void
run() {
final
ReadReadyHandler handler =
readReadyHandler;
if (
handler != null) {
handler.
readReady();
}
}
});
}
public void
suspendReads() {
resumed = false;
}
public void
wakeupReads() {
resumeReads();
}
public boolean
isReadResumed() {
return
resumed;
}
public void
awaitReadable() throws
IOException {
// always ready
}
public void
awaitReadable(final long
time, final
TimeUnit timeUnit) throws
IOException {
// always ready
}
public void
terminateReads() throws
IOException {
if (!
shutdown) {
shutdown = true;
if(
readReadyHandler != null) {
readReadyHandler.
terminated();
}
}
}
public
XnioIoThread getReadThread() {
return
readThread;
}
public
XnioWorker getWorker() {
return
worker;
}
}