/*
* Copyright 2014 Jeanfrancois Arcand
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
/*
* Copyright 2009 Richard Zschech.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package org.atmosphere.gwt20.client;
import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.rpc.SerializationException;
import com.google.web.bindery.autobean.shared.AutoBean;
import com.google.web.bindery.autobean.shared.AutoBeanCodex;
import com.google.web.bindery.autobean.shared.AutoBeanFactory;
import com.google.web.bindery.autobean.shared.AutoBeanUtils;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.logging.Logger;
/**
* The base class for serializers. To instantiate this class follow this example:
* <pre><code>
* <p/>
* {@literal @SerialTypes({ MyType1.class, MyType2.class })}
* public abstract class MyCometSerializer extends AtmosphereGWTSerializer {}
* <p/>
* AtmosphereGWTSerializer serializer = GWT.create(MyCometSerializer.class);
* AtmosphereClient client = new AtmosphereClient(url, serializer, listener);
* </code></pre>
* <p/>
* Where MyType1 and MyType2 are the types that your expecting to receive from the server.
* If you have a class hierarchy of messages that you want to send you only need to supply the base class here.
* <p/>
* For instance:
* <pre><code>
* public class Message {}
* <p/>
* public class MessageA extends Message {}
* <p/>
* public class MessageB extends Message {}
* <p/>
* {@literal @SerialTypes( Message.class )}
* public abstract class MyCometSerializer extends AtmosphereGWTSerializer {}
* <p/>
* </code></pre>
*/
public class AutoBeanClientSerializer implements ClientSerializer {
private static final Logger logger = Logger.getLogger(AutoBeanClientSerializer.class.getName());
private Map<Class, AutoBeanFactory> beanFactories;
private AutoBeanFactory activeBeanFactory;
private Class<Object> activeBeanClass;
// buffer in order to capture split messages
private StringBuffer buffer = new StringBuffer(16100);
public void registerBeanFactory(Class<AutoBeanFactory> factoryClass, Class forBean) {
registerBeanFactory((AutoBeanFactory) GWT.create(factoryClass), forBean);
}
public void registerBeanFactory(AutoBeanFactory factory, Class forBean) {
if (beanFactories == null) {
beanFactories = new HashMap<Class, AutoBeanFactory>();
}
beanFactories.put(forBean, factory);
if (activeBeanFactory == null) {
setActiveBeanFactory(forBean);
}
}
public void setActiveBeanFactory(Class forBean) {
if (beanFactories == null) {
throw new IllegalStateException("No bean factory available");
}
AutoBeanFactory factory = beanFactories.get(forBean);
if (factory == null) {
throw new IllegalStateException("No bean factory available");
}
activeBeanFactory = factory;
activeBeanClass = forBean;
}
@Override
public Object deserialize(String raw) throws SerializationException {
buffer.append(raw); // TODO buffer messages in case we receive a chunked message
// split up in different parts - based on the {}
// this is necessary because multiple objects can be chunked in one single string
int brackets = 0;
int start = 0;
List<String> messages = new ArrayList<String>();
for (int i = 0; i < buffer.length(); i++) {
// detect brackets
if (buffer.charAt(i) == '{') {
++brackets;
} else if (buffer.charAt(i) == '}') --brackets;
// new message
if (brackets == 0) {
messages.add(buffer.substring(start, i + 1));
start = i + 1;
}
}
buffer.delete(0, start);
// create the objects
List<Object> objects = new ArrayList<Object>(messages.size());
for (String message : messages) {
try {
logger.info("Deserialize " + message + " from " + raw);
Object event = AutoBeanCodex.decode(activeBeanFactory, activeBeanClass, message).as();
objects.add(event);
} catch (RuntimeException e) {
throw new SerializationException(e);
}
}
return objects;
}
@Override
public String serialize(Object message) throws SerializationException {
try {
AutoBean<Object> bean = AutoBeanUtils.getAutoBean(message);
return AutoBeanCodex.encode(bean).getPayload();
} catch (RuntimeException e) {
throw new SerializationException(e);
}
}
}