/*
*
* 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 org.apache.airavata.xbaya.component.dynamic;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;
import org.apache.airavata.xbaya.XBayaException;
import org.apache.airavata.xbaya.invoker.Invoker;
import xsul.wsif.WSIFMessage;
import xsul.xwsif_runtime.WSIFClient;
public class DynamicInvoker implements Invoker {
private URL jarUrl;
private String className;
private String operationName;
private Object[] inputs;
private Object result;
/**
* Constructs a DynamicInvoker.
*
* @param className
* @param jarUrl
* @param operationName
*/
public DynamicInvoker(String className, URL jarUrl, String operationName, Object[] inputs) {
this.className = className;
this.jarUrl = jarUrl;
this.operationName = operationName;
this.inputs = inputs;
}
/**
* @see org.apache.airavata.xbaya.invoker.WorkflowInvoker#getOutput(java.lang.String)
*/
public Object getOutput(String name) throws XBayaException {
waitToFinish();
return result;
}
/**
* @see org.apache.airavata.xbaya.invoker.WorkflowInvoker#invoke()
*/
public boolean invoke() throws XBayaException {
try {
Class<?> targetClass = Class.forName(this.className);
Object obj = targetClass.newInstance();
Method[] methods = targetClass.getDeclaredMethods();
Method targetMethod = null;
for (Method method : methods) {
if (this.operationName.equals(method.getName())) {
targetMethod = method;
break;
}
}
if (targetMethod == null) {
throw new XBayaException("Could not find the method using reflection: " + this.operationName);
}
targetMethod.setAccessible(true);
this.result = targetMethod.invoke(obj, inputs);
} catch (Exception e) {
throw new XBayaException(e);
}
return true;
}
/**
* @see org.apache.airavata.xbaya.invoker.WorkflowInvoker#setInput(java.lang.String, java.lang.Object)
*/
public void setInput(String name, Object value) throws XBayaException {
}
/**
* @see org.apache.airavata.xbaya.invoker.WorkflowInvoker#setOperation(java.lang.String)
*/
public void setOperation(String operationName) throws XBayaException {
this.operationName = operationName;
}
/**
* @see org.apache.airavata.xbaya.invoker.WorkflowInvoker#setup()
*/
public void setup() throws XBayaException {
Class[] parameters = new Class[] { URL.class };
URLClassLoader sysloader = (URLClassLoader) ClassLoader.getSystemClassLoader();
Class sysclass = URLClassLoader.class;
try {
Method method = sysclass.getDeclaredMethod("addURL", parameters);
method.setAccessible(true);
method.invoke(sysloader, new Object[] { this.jarUrl });
} catch (Throwable t) {
t.printStackTrace();
throw new XBayaException("Error, could not add URL to system classloader");
}
}
/**
* @see org.apache.airavata.xbaya.invoker.WorkflowInvoker#waitToFinish()
*/
public void waitToFinish() throws XBayaException {
while (this.result == null) {
try {
Thread.sleep(200);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
/**
* @see org.apache.airavata.xbaya.invoker.WorkflowInvoker#getOutputs()
*/
public WSIFMessage getOutputs() throws XBayaException {
waitToFinish();
return (WSIFMessage) this.result;
}
@Override
public WSIFClient getClient() {
return null;
}
@Override
public WSIFMessage getInputs() throws XBayaException {
return null;
}
@Override
public WSIFMessage getFault() throws XBayaException {
return null;
}
}