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//
// ========================================================================
// Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.client;
import java.nio.ByteBuffer;
import java.util.Iterator;
import java.util.List;
import org.eclipse.jetty.client.api.ContentResponse;
import org.eclipse.jetty.client.api.Request;
import org.eclipse.jetty.client.api.Response;
import org.eclipse.jetty.client.api.Result;
import org.eclipse.jetty.http.HttpField;
import org.eclipse.jetty.util.Callback;
import org.eclipse.jetty.util.IteratingNestedCallback;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
public class ResponseNotifier
{
private static final Logger LOG = Log.getLogger(ResponseNotifier.class);
public void notifyBegin(List<Response.ResponseListener> listeners, Response response)
{
// Optimized to avoid allocations of iterator instances
for (int i = 0; i < listeners.size(); ++i)
{
Response.ResponseListener listener = listeners.get(i);
if (listener instanceof Response.BeginListener)
notifyBegin((Response.BeginListener)listener, response);
}
}
private void notifyBegin(Response.BeginListener listener, Response response)
{
try
{
listener.onBegin(response);
}
catch (Throwable x)
{
LOG.info("Exception while notifying listener " + listener, x);
}
}
public boolean notifyHeader(List<Response.ResponseListener> listeners, Response response, HttpField field)
{
boolean result = true;
// Optimized to avoid allocations of iterator instances
for (int i = 0; i < listeners.size(); ++i)
{
Response.ResponseListener listener = listeners.get(i);
if (listener instanceof Response.HeaderListener)
result &= notifyHeader((Response.HeaderListener)listener, response, field);
}
return result;
}
private boolean notifyHeader(Response.HeaderListener listener, Response response, HttpField field)
{
try
{
return listener.onHeader(response, field);
}
catch (Throwable x)
{
LOG.info("Exception while notifying listener " + listener, x);
return false;
}
}
public void notifyHeaders(List<Response.ResponseListener> listeners, Response response)
{
// Optimized to avoid allocations of iterator instances
for (int i = 0; i < listeners.size(); ++i)
{
Response.ResponseListener listener = listeners.get(i);
if (listener instanceof Response.HeadersListener)
notifyHeaders((Response.HeadersListener)listener, response);
}
}
private void notifyHeaders(Response.HeadersListener listener, Response response)
{
try
{
listener.onHeaders(response);
}
catch (Throwable x)
{
LOG.info("Exception while notifying listener " + listener, x);
}
}
public void notifyContent(List<Response.ResponseListener> listeners, Response response, ByteBuffer buffer, Callback callback)
{
// Here we use an IteratingNestedCallback not to avoid the stack overflow, but to
// invoke the listeners one after the other. When all of them have invoked the
// callback they got passed, the callback passed to this method is finally invoked.
ContentCallback contentCallback = new ContentCallback(listeners, response, buffer, callback);
contentCallback.iterate();
}
private void notifyContent(Response.AsyncContentListener listener, Response response, ByteBuffer buffer, Callback callback)
{
try
{
listener.onContent(response, buffer, callback);
}
catch (Throwable x)
{
LOG.info("Exception while notifying listener " + listener, x);
}
}
public void notifySuccess(List<Response.ResponseListener> listeners, Response response)
{
// Optimized to avoid allocations of iterator instances
for (int i = 0; i < listeners.size(); ++i)
{
Response.ResponseListener listener = listeners.get(i);
if (listener instanceof Response.SuccessListener)
notifySuccess((Response.SuccessListener)listener, response);
}
}
private void notifySuccess(Response.SuccessListener listener, Response response)
{
try
{
listener.onSuccess(response);
}
catch (Throwable x)
{
LOG.info("Exception while notifying listener " + listener, x);
}
}
public void notifyFailure(List<Response.ResponseListener> listeners, Response response, Throwable failure)
{
// Optimized to avoid allocations of iterator instances
for (int i = 0; i < listeners.size(); ++i)
{
Response.ResponseListener listener = listeners.get(i);
if (listener instanceof Response.FailureListener)
notifyFailure((Response.FailureListener)listener, response, failure);
}
}
private void notifyFailure(Response.FailureListener listener, Response response, Throwable failure)
{
try
{
listener.onFailure(response, failure);
}
catch (Throwable x)
{
LOG.info("Exception while notifying listener " + listener, x);
}
}
public void notifyComplete(List<Response.ResponseListener> listeners, Result result)
{
// Optimized to avoid allocations of iterator instances
for (int i = 0; i < listeners.size(); ++i)
{
Response.ResponseListener listener = listeners.get(i);
if (listener instanceof Response.CompleteListener)
notifyComplete((Response.CompleteListener)listener, result);
}
}
private void notifyComplete(Response.CompleteListener listener, Result result)
{
try
{
listener.onComplete(result);
}
catch (Throwable x)
{
LOG.info("Exception while notifying listener " + listener, x);
}
}
public void forwardSuccess(List<Response.ResponseListener> listeners, Response response)
{
notifyBegin(listeners, response);
for (Iterator<HttpField> iterator = response.getHeaders().iterator(); iterator.hasNext();)
{
HttpField field = iterator.next();
if (!notifyHeader(listeners, response, field))
iterator.remove();
}
notifyHeaders(listeners, response);
if (response instanceof ContentResponse)
// TODO: handle callback
notifyContent(listeners, response, ByteBuffer.wrap(((ContentResponse)response).getContent()), new Callback.Adapter());
notifySuccess(listeners, response);
}
public void forwardSuccessComplete(List<Response.ResponseListener> listeners, Request request, Response response)
{
forwardSuccess(listeners, response);
notifyComplete(listeners, new Result(request, response));
}
public void forwardFailure(List<Response.ResponseListener> listeners, Response response, Throwable failure)
{
notifyBegin(listeners, response);
for (Iterator<HttpField> iterator = response.getHeaders().iterator(); iterator.hasNext();)
{
HttpField field = iterator.next();
if (!notifyHeader(listeners, response, field))
iterator.remove();
}
notifyHeaders(listeners, response);
if (response instanceof ContentResponse)
// TODO: handle callback
notifyContent(listeners, response, ByteBuffer.wrap(((ContentResponse)response).getContent()), new Callback.Adapter());
notifyFailure(listeners, response, failure);
}
public void forwardFailureComplete(List<Response.ResponseListener> listeners, Request request, Throwable requestFailure, Response response, Throwable responseFailure)
{
forwardFailure(listeners, response, responseFailure);
notifyComplete(listeners, new Result(request, requestFailure, response, responseFailure));
}
private class ContentCallback extends IteratingNestedCallback
{
private final List<Response.ResponseListener> listeners;
private final Response response;
private final ByteBuffer buffer;
private int index;
private ContentCallback(List<Response.ResponseListener> listeners, Response response, ByteBuffer buffer, Callback callback)
{
super(callback);
this.listeners = listeners;
this.response = response;
// Slice the buffer to avoid that listeners peek into data they should not look at.
this.buffer = buffer.slice();
}
@Override
protected Action process() throws Exception
{
if (index == listeners.size())
return Action.SUCCEEDED;
Response.ResponseListener listener = listeners.get(index);
if (listener instanceof Response.AsyncContentListener)
{
// The buffer was sliced, so we always clear it
// (clear => position=0, limit=capacity) before
// passing it to the listener that may consume it.
buffer.clear();
ResponseNotifier.this.notifyContent((Response.AsyncContentListener)listener, response, buffer, this);
return Action.SCHEDULED;
}
else
{
succeeded();
return Action.SCHEDULED;
}
}
@Override
public void succeeded()
{
++index;
super.succeeded();
}
}
}
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