//
// ========================================================================
// Copyright (c) 1995-2014 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.websocket.jsr356;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import javax.websocket.Encoder;
import javax.websocket.EndpointConfig;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.websocket.jsr356.metadata.EncoderMetadata;
import org.eclipse.jetty.websocket.jsr356.metadata.EncoderMetadataSet;
/**
* Represents all of the declared {@link Encoder}s that the Container is aware of.
*/
public class EncoderFactory implements Configurable
{
public static class Wrapper implements Configurable
{
private final Encoder encoder;
private final EncoderMetadata metadata;
private Wrapper(Encoder encoder, EncoderMetadata metadata)
{
this.encoder = encoder;
this.metadata = metadata;
}
public Encoder getEncoder()
{
return encoder;
}
public EncoderMetadata getMetadata()
{
return metadata;
}
@Override
public void init(EndpointConfig config)
{
this.encoder.init(config);
}
}
private static final Logger LOG = Log.getLogger(EncoderFactory.class);
private final EncoderMetadataSet metadatas;
private EncoderFactory parentFactory;
private Map<Class<?>, Wrapper> activeWrappers;
public EncoderFactory(EncoderMetadataSet metadatas)
{
this.metadatas = metadatas;
this.activeWrappers = new ConcurrentHashMap<>();
}
public EncoderFactory(EncoderMetadataSet metadatas, EncoderFactory parentFactory)
{
this(metadatas);
this.parentFactory = parentFactory;
}
public Encoder getEncoderFor(Class<?> type)
{
Wrapper wrapper = getWrapperFor(type);
if (wrapper == null)
{
return null;
}
return wrapper.encoder;
}
public EncoderMetadata getMetadataFor(Class<?> type)
{
LOG.debug("getMetadataFor({})",type);
EncoderMetadata metadata = metadatas.getMetadataByType(type);
if (metadata != null)
{
return metadata;
}
if (parentFactory != null)
{
return parentFactory.getMetadataFor(type);
}
return null;
}
public Wrapper getWrapperFor(Class<?> type)
{
synchronized (activeWrappers)
{
Wrapper wrapper = activeWrappers.get(type);
// Try parent (if needed)
if ((wrapper == null) && (parentFactory != null))
{
wrapper = parentFactory.getWrapperFor(type);
}
if (wrapper == null)
{
// Attempt to create Wrapper on demand
EncoderMetadata metadata = metadatas.getMetadataByType(type);
if (metadata == null)
{
return null;
}
wrapper = newWrapper(metadata);
// track wrapper
activeWrappers.put(type,wrapper);
}
return wrapper;
}
}
@Override
public void init(EndpointConfig config)
{
LOG.debug("init({})",config);
// Instantiate all declared encoders
for (EncoderMetadata metadata : metadatas)
{
Wrapper wrapper = newWrapper(metadata);
activeWrappers.put(metadata.getObjectType(),wrapper);
}
// Initialize all encoders
for (Wrapper wrapper : activeWrappers.values())
{
wrapper.encoder.init(config);
}
}
private Wrapper newWrapper(EncoderMetadata metadata)
{
Class<? extends Encoder> encoderClass = metadata.getCoderClass();
try
{
Encoder encoder = encoderClass.newInstance();
return new Wrapper(encoder,metadata);
}
catch (InstantiationException | IllegalAccessException e)
{
throw new IllegalStateException("Unable to instantiate Encoder: " + encoderClass.getName());
}
}
}