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/*
* Copyright 2012 ETH Zuerich, CISD
*
* 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 ch.systemsx.cisd.common.conversation;
import java.io.Serializable;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import ch.systemsx.cisd.common.serviceconversation.server.ServiceConversationServer;
/**
* MethodInvocation represents a remote method invocation. It contains the name and the arguments of a
* method to be executed on a remote server. It is Serializable to be transferable through the service
* conversation framework.
*
* @author anttil
*/
public class MethodInvocation implements Serializable
{
private static final long serialVersionUID = 8679256131459236150L;
private String methodName;
private Object[] arguments;
public MethodInvocation(String methodName, Object[] arguments) {
this.methodName = methodName;
this.arguments = arguments;
}
/**
* Executes the method on given target object. Adds a ProgressListener instance as a last argument
* of the call.
*
* @param target The target object on which the method call will be executed
* @param server ServiceConversationServer that will receive the progress reports
* @param conversationId Id of the conversation
* @param clientTimeOut The remote client making this method call will abort if it has not
* received any messages from the server within the timeout (represented in milliseconds)
* @returns The return value of the method call
*/
public Serializable executeOn(Object target, ServiceConversationServer server, String conversationId, int clientTimeOut) {
RateLimitedProgressListener progressListener = new RateLimitedProgressListener(server, conversationId, clientTimeOut / 10);
Object[] argumentsWithProgressListener = createArgumentsWithProgressListener(progressListener);
try
{
Method m = findMethodOn(target, this.methodName, argumentsWithProgressListener);
return (Serializable)m.invoke(target, argumentsWithProgressListener);
} catch (InvocationTargetException e)
{
throw (RuntimeException)e.getCause();
} catch (Exception e) {
throw new RuntimeException("Method call failed", e);
} finally {
progressListener.close();
}
}
private Object[] createArgumentsWithProgressListener(IProgressListener progressListener) {
List<Object> argumentsWithProgressListener = new ArrayList<Object>();
argumentsWithProgressListener.addAll(Arrays.asList(this.arguments));
argumentsWithProgressListener.add(progressListener);
return argumentsWithProgressListener.toArray(new Object[0]);
}
private Method findMethodOn(Object o, String name, Object[] args) throws SecurityException, NoSuchMethodException {
for (Method method : o.getClass().getMethods()) {
if (!method.getName().equals(name)) {
continue;
}
Class<?>[] parameterTypes = method.getParameterTypes();
if (parameterTypes.length != args.length) {
continue;
}
boolean matches = true;
for (int i = 0; i < parameterTypes.length; i++) {
if (!parameterTypes[i].isAssignableFrom(args[i].getClass())) {
matches = false;
break;
}
}
if (matches) {
return method;
}
}
throw new NoSuchMethodException();
}
@Override
public String toString() {
return "MethodCall "+this.methodName+"("+Arrays.asList(this.arguments)+")";
}
public String getMethodName() {
return this.methodName;
}
public Object[] getArguments() {
return this.arguments;
}
}