//
// ========================================================================
// 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.Decoder;
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.DecoderMetadata;
import org.eclipse.jetty.websocket.jsr356.metadata.DecoderMetadataSet;
/**
* Factory for {@link DecoderMetadata}
* <p>
* Relies on search order of parent {@link DecoderFactory} instances as such.
* <ul>
* <li>From Static DecoderMetadataSet (based on data in annotations and static EndpointConfig)</li>
* <li>From Composite DecoderMetadataSet (based static and instance specific EndpointConfig)</li>
* <li>Container declared DecoderMetadataSet (primitives)</li>
* </ul>
*/
public class DecoderFactory implements Configurable
{
public static class Wrapper implements Configurable
{
private final Decoder decoder;
private final DecoderMetadata metadata;
private Wrapper(Decoder decoder, DecoderMetadata metadata)
{
this.decoder = decoder;
this.metadata = metadata;
}
public Decoder getDecoder()
{
return decoder;
}
public DecoderMetadata getMetadata()
{
return metadata;
}
@Override
public void init(EndpointConfig config)
{
this.decoder.init(config);
}
}
private static final Logger LOG = Log.getLogger(DecoderFactory.class);
private final DecoderMetadataSet metadatas;
private DecoderFactory parentFactory;
private Map<Class<?>, Wrapper> activeWrappers;
public DecoderFactory(DecoderMetadataSet metadatas)
{
this.metadatas = metadatas;
this.activeWrappers = new ConcurrentHashMap<>();
}
public DecoderFactory(DecoderMetadataSet metadatas, DecoderFactory parentFactory)
{
this(metadatas);
this.parentFactory = parentFactory;
}
public Decoder getDecoderFor(Class<?> type)
{
Wrapper wrapper = getWrapperFor(type);
if (wrapper == null)
{
return null;
}
return wrapper.decoder;
}
public DecoderMetadata getMetadataFor(Class<?> type)
{
LOG.debug("getMetadataFor({})",type);
DecoderMetadata 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
DecoderMetadata 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 decoders
for (DecoderMetadata metadata : metadatas)
{
Wrapper wrapper = newWrapper(metadata);
activeWrappers.put(metadata.getObjectType(),wrapper);
}
// Initialize all decoders
for (Wrapper wrapper : activeWrappers.values())
{
wrapper.decoder.init(config);
}
}
public Wrapper newWrapper(DecoderMetadata metadata)
{
Class<? extends Decoder> decoderClass = metadata.getCoderClass();
try
{
Decoder decoder = decoderClass.newInstance();
return new Wrapper(decoder,metadata);
}
catch (InstantiationException | IllegalAccessException e)
{
throw new IllegalStateException("Unable to instantiate Decoder: " + decoderClass.getName());
}
}
}