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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.jdisc;
import com.yahoo.jdisc.handler.CompletionHandler;
import com.yahoo.jdisc.handler.ContentChannel;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.nio.ByteBuffer;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
/**
* @author baldersheim
*/
public class MaxPendingContentChannelOutputStream extends ContentChannelOutputStream {
private final long maxPending;
private final AtomicLong sent = new AtomicLong(0);
private final AtomicLong acked = new AtomicLong(0);
public MaxPendingContentChannelOutputStream(ContentChannel endpoint, long maxPending) {
super(endpoint);
this.maxPending = maxPending;
}
private long pendingBytes() {
return sent.get() - acked.get();
}
private class TrackCompletion implements CompletionHandler {
private final long written;
private final AtomicBoolean replied = new AtomicBoolean(false);
TrackCompletion(long written) {
this.written = written;
sent.addAndGet(written);
}
@Override
public void completed() {
if (!replied.getAndSet(true)) {
acked.addAndGet(written);
}
}
@Override
public void failed(Throwable t) {
if (!replied.getAndSet(true)) {
acked.addAndGet(written);
}
}
}
@Override
public void send(ByteBuffer src) throws IOException {
try {
stallWhilePendingAbove(maxPending);
}
catch (InterruptedException ignored) {
throw new InterruptedIOException("Interrupted waiting for IO");
}
CompletionHandler pendingTracker = new TrackCompletion(src.remaining());
try {
send(src, pendingTracker);
}
catch (Throwable throwable) {
pendingTracker.failed(throwable);
throw throwable;
}
}
private void stallWhilePendingAbove(long pending) throws InterruptedException {
while (pendingBytes() > pending) {
Thread.sleep(1);
}
}
@Override
public void flush() throws IOException {
super.flush();
try {
stallWhilePendingAbove(0);
}
catch (InterruptedException e) {
throw new InterruptedIOException("Interrupted waiting for IO");
}
}
}
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