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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.controller.restapi;
import com.yahoo.jdisc.Response;
import com.yahoo.jdisc.handler.CompletionHandler;
import com.yahoo.jdisc.handler.ContentChannel;
import com.yahoo.jdisc.handler.ResponseHandler;
import java.nio.ByteBuffer;
import java.util.Optional;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* A {@link ResponseHandler} that caches the response content and
* converts a {@link Response} to {@link com.yahoo.application.container.handler.Response}.
*
* @author bjorncs
*/
public class ResponseHandlerToApplicationResponseWrapper implements ResponseHandler {
private Response response;
private SimpleContentChannel contentChannel;
@Override
public ContentChannel handleResponse(Response response) {
this.response = response;
SimpleContentChannel contentChannel = new SimpleContentChannel();
this.contentChannel = contentChannel;
return contentChannel;
}
public Optional<com.yahoo.application.container.handler.Response> toResponse() {
return Optional.ofNullable(this.response)
.map(r -> {
byte[] bytes = contentChannel.toByteArray();
return new com.yahoo.application.container.handler.Response(response.getStatus(), bytes);
});
}
private static class SimpleContentChannel implements ContentChannel {
private final Queue<ByteBuffer> buffers = new ConcurrentLinkedQueue<>();
private final AtomicBoolean closed = new AtomicBoolean(false);
@Override
public void write(ByteBuffer buf, CompletionHandler handler) {
buffers.add(buf);
handler.completed();
}
@Override
public void close(CompletionHandler handler) {
handler.completed();
if (closed.getAndSet(true)) {
throw new IllegalStateException("Already closed");
}
}
byte[] toByteArray() {
if (!closed.get()) {
throw new IllegalStateException("Content channel not closed yet");
}
int totalSize = 0;
for (ByteBuffer responseBuffer : buffers) {
totalSize += responseBuffer.remaining();
}
ByteBuffer totalBuffer = ByteBuffer.allocate(totalSize);
for (ByteBuffer responseBuffer : buffers) {
totalBuffer.put(responseBuffer);
}
return totalBuffer.array();
}
}
}
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