flex.messaging.FactoryDestination Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 flex.messaging;
import flex.messaging.config.ConfigMap;
import flex.messaging.config.ConfigurationException;
import flex.messaging.log.Log;
public abstract class FactoryDestination extends Destination
{
private static final String FACTORY = "factory";
private static final String DEFAULT_FACTORY = "java";
// Errors
private static int INVALID_FACTORY = 11103;
private static int FACTORY_CANNOT_BE_RETURNED = 11118;
// FactoryDestination's properties
private FlexFactory factory;
private String source;
private String scope = FlexFactory.SCOPE_REQUEST;
// FactoryDestination internal
private String factoryId = DEFAULT_FACTORY;
private FactoryInstance factoryInstance;
private ConfigMap factoryProperties;
//--------------------------------------------------------------------------
//
// Constructor
//
//--------------------------------------------------------------------------
/**
* Constructs an unmanaged FactoryDestination instance.
*/
public FactoryDestination()
{
this(false);
}
/**
* Constructs a FactoryDestination with the indicated management.
*
* @param enableManagement true if the FactoryDestination
* is manageable; otherwise false.
*/
public FactoryDestination(boolean enableManagement)
{
super(enableManagement);
}
//--------------------------------------------------------------------------
//
// Initialize, validate, start, and stop methods.
//
//--------------------------------------------------------------------------
/**
* Initializes the FactoryDestination with the properties.
* @param id the factory id
* @param properties Properties for the FactoryDestination.
*/
public void initialize(String id, ConfigMap properties)
{
super.initialize(id, properties);
if (properties == null || properties.size() == 0)
return;
// Need to cache this for later. TODO: We shouldn't need to do this.
factoryProperties = properties;
factoryId = properties.getPropertyAsString(FACTORY, factoryId);
scope = properties.getPropertyAsString(FlexFactory.SCOPE, scope);
source = properties.getPropertyAsString(FlexFactory.SOURCE, source);
if (source == null)
source = getId();
if (factory != null)
factory.initialize(getId(), factoryProperties);
}
/**
* Verifies that the FactoryDestination is in valid state before
* it is started.
*/
protected void validate()
{
if (isValid())
return;
super.validate();
if (factory == null)
{
if (factoryId == null)
{
factoryId = DEFAULT_FACTORY;
}
MessageBroker broker = getService().getMessageBroker();
FlexFactory f = broker.getFactory(factoryId);
if (f == null)
{
ConfigurationException ex = new ConfigurationException();
ex.setMessage(INVALID_FACTORY, new Object[] {getId(), factoryId});
throw ex;
}
factory = f;
}
if (scope == null)
scope = FlexFactory.SCOPE_REQUEST;
if (source == null)
source = getId();
}
//--------------------------------------------------------------------------
//
// Public Getters and Setters for Destination properties
//
//--------------------------------------------------------------------------
/**
* Returns the factory of the FactoryDestination. Before a valid
* FlexFactory can be returned, MessageBroker and
* hence Service of the Destination has to be set.
* @return FlexFactory the FlexFactory object
*/
public FlexFactory getFactory()
{
if (factory == null)
{
if (factoryId == null)
{
factoryId = DEFAULT_FACTORY;
}
if (getService() == null)
{
// Factory cannot be returned without ''{0}'' set.
ConfigurationException ex = new ConfigurationException();
ex.setMessage(FACTORY_CANNOT_BE_RETURNED, new Object[] {"Service"});
throw ex;
}
if (getService().getMessageBroker() == null)
{
// Factory cannot be returned without ''{0}'' set.
ConfigurationException ex = new ConfigurationException();
ex.setMessage(FACTORY_CANNOT_BE_RETURNED, new Object[] {"MessageBroker"});
throw ex;
}
MessageBroker broker = getService().getMessageBroker();
FlexFactory f = broker.getFactory(factoryId);
if (f == null)
{
ConfigurationException ex = new ConfigurationException();
ex.setMessage(INVALID_FACTORY, new Object[] {getId(), factoryId});
throw ex;
}
factory = f;
}
return factory;
}
/**
* Sets the factory of the FactoryDestination.
* MessageBroker has to know the factory before it can be
* assigned to the destination.
*
* @param id The id of the factory.
*/
public void setFactory(String id)
{
if (isStarted())
{
MessageBroker broker = getService().getMessageBroker();
FlexFactory factory = broker.getFactory(id);
if (factory == null)
{
ConfigurationException ex = new ConfigurationException();
ex.setMessage(INVALID_FACTORY, new Object[] {getId(), factory});
throw ex;
}
setFactory(factory);
}
factoryId = id;
}
/**
* Sets the factory of the FactoryDestination.
*
* @param factory the FlexFactory object
*/
public void setFactory(FlexFactory factory)
{
this.factory = factory;
}
/**
* Returns the FactoryInstance. FactoryInstance
* stores configuration state used for retrieving an instance from
* the factory. This needs to be called after calling setSource
* and setScope methods.
* @return FactoryInstance current FactoryInstance object
*/
public FactoryInstance getFactoryInstance()
{
// This is needed for HibernateAssembler
return getFactoryInstance(factoryProperties);
}
/**
* Returns a FactoryInstance using the properties passed in.
*
* @param properties Properties to be used while creating the FactoryInstance.
*/
private FactoryInstance getFactoryInstance(ConfigMap properties)
{
// Automatically create a factory instance if not already set
if (factoryInstance == null)
factoryInstance = createFactoryInstance(properties);
return factoryInstance;
}
/**
* Creates a factory instance using the properties passed in.
*
* @param properties Properties to be used while creating the FactoryInstance.
*/
private FactoryInstance createFactoryInstance(ConfigMap properties)
{
if (properties == null)
properties = new ConfigMap();
properties.put(FlexFactory.SOURCE, source);
properties.put(FlexFactory.SCOPE, scope);
FactoryInstance factoryInstance = getFactory().createFactoryInstance(getId(), properties);
return factoryInstance;
}
/**
* Returns the scope of the FactoryDestination.
*
* @return scope of the FactoryDestination.
*/
public String getScope()
{
return scope;
}
/**
* Sets the scope of the FactoryDestination that is used
* in FactoryInstance creation. Scope cannot be changed to and
* from application scope once FactoryInstance is initialized.
*
* @param scope the scope
*/
public void setScope(String scope)
{
if (factoryInstance != null)
{
if (FlexFactory.SCOPE_APPLICATION.equals(this.scope)
&& !FlexFactory.SCOPE_APPLICATION.equals(scope))
{
if (Log.isWarn())
Log.getLogger(getLogCategory()).warn(
"Current scope is "+FlexFactory.SCOPE_APPLICATION
+" and it cannot be changed to "+scope
+" once factory instance is initialized.");
return;
}
else if (!FlexFactory.SCOPE_APPLICATION.equals(this.scope)
&& FlexFactory.SCOPE_APPLICATION.equals(scope))
{
if (Log.isWarn())
Log.getLogger(getLogCategory()).warn(
"Current scope is "+this.scope
+" and it cannot be changed to "+FlexFactory.SCOPE_APPLICATION
+" once factory instance is initialized.");
return;
}
factoryInstance.setScope(scope);
}
this.scope = scope;
}
/**
* Gets the source of the FactoryDestination.
*
* @return the source of the FactoryDestination.
*/
public String getSource()
{
return source;
}
/**
* Sets the source of the FactoryDestination that is used
* in FactoryInstance creation. Source cannot be changed once
* FactoryInstance is initialized and the scope is application.
*
* @param source the source string
*/
public void setSource(String source)
{
if (factoryInstance != null)
{
if (FlexFactory.SCOPE_APPLICATION.equals(scope))
{
if (Log.isWarn())
Log.getLogger(getLogCategory()).warn(
"Source of the destination cannot be changed once "
+ "factory instance is already initialized and it has "
+ FlexFactory.SCOPE_APPLICATION +" scope");
return;
}
factoryInstance.setSource(source);
}
this.source = source;
}
/**
* This method first calls stop on its superclass Destination and then
* removes any assemblers from the ServletContext or Session that are ready for removal.
* If an assembler is only used by a single destination (attribute-id==destination-id) then
* it is removed. If an assembler is shared across destinations, (attribute-id<>destination-id)
* then it is only removed if its reference count (maintained in MessageBroker) is
* down to zero
*/
public void stop()
{
if (isStarted())
{
super.stop();
// destroy factory instance to free up resources
if (factory != null && (factory instanceof DestructibleFlexFactory))
((DestructibleFlexFactory)factory).destroyFactoryInstance(factoryInstance);
}
else
{
super.stop();
}
}
}
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