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/*
* 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 pojo.provider;
import java.lang.reflect.Method;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.provider.ImplementationProvider;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
import org.apache.tuscany.sca.runtime.RuntimeComponentService;
import org.osoa.sca.ServiceRuntimeException;
import pojo.POJOImplementation;
/**
* An implementation provider for sample CRUD implementations.
*
* The implementation provider is responsible for handling the lifecycle of a component
* implementation and creating operation invokers for the service operations provided
* by the implementation.
*
* The start() and stop() methods are called when a component is started
* and stopped. In this example we are using that opportunity to call init and destroy methods
* on the POJO instance if these methods exist.
*
* The createInvoker method is called for each operation provided by the component
* implementation. The implementation provider can create an invoker and initialize it
* at that time to minimize the amount of work to be performed on each invocation.
*
* For example here we are looking up the Java method corresponding to the service operation
* at passing it to the invoker constructor. This way the invoker won't have to lookup the Java
* method on each invocation.
*/
class POJOImplementationProvider implements ImplementationProvider {
private POJOImplementation implementation;
private Object pojoInstance;
/**
* Constructs a new CRUD implementation.
*/
POJOImplementationProvider(RuntimeComponent component, POJOImplementation implementation) {
this.implementation = implementation;
// Create a new instance of the POJO
try {
pojoInstance = implementation.getPOJOClass().newInstance();
} catch (Exception e) {
throw new ServiceRuntimeException(e);
}
}
public void start() {
try {
// Invoke the POJO's init method
Method initMethod = implementation.getMethods().get("init");
if (initMethod != null) {
initMethod.invoke(pojoInstance);
}
} catch (Exception e) {
throw new ServiceRuntimeException(e);
}
}
public void stop() {
try {
// Invoke the POJO's destroy method
Method destroyMethod = implementation.getMethods().get("destroy");
if (destroyMethod != null) {
destroyMethod.invoke(pojoInstance);
}
} catch (Exception e) {
throw new ServiceRuntimeException(e);
} finally {
pojoInstance = null;
}
}
public Invoker createInvoker(RuntimeComponentService service, Operation operation) {
Method method = implementation.getMethods().get(operation.getName());
POJOImplementationInvoker invoker = new POJOImplementationInvoker(pojoInstance, operation, method);
return invoker;
}
public boolean supportsOneWayInvocation() {
return false;
}
}
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