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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 org.apache.tuscany.extension.script;
import java.lang.reflect.InvocationTargetException;
import javax.script.Invocable;
import javax.script.ScriptException;
import org.apache.tuscany.spi.component.AtomicComponent;
import org.apache.tuscany.spi.component.ComponentException;
import org.apache.tuscany.spi.component.InstanceWrapper;
import org.apache.tuscany.spi.component.InvalidConversationSequenceException;
import org.apache.tuscany.spi.component.ScopeContainer;
import org.apache.tuscany.spi.component.TargetException;
import org.apache.tuscany.spi.component.WorkContext;
import org.apache.tuscany.spi.extension.TargetInvokerExtension;
import org.apache.tuscany.spi.model.Scope;
/**
* Perform the actual script invocation
* TODO: move vertually all of this to SPI TargetInvokerExtension
*/
@SuppressWarnings("deprecation")
public class ScriptInvoker<T> extends TargetInvokerExtension {
protected Object clazz;
protected String operationName;
private final AtomicComponent<T> component;
private final ScopeContainer scopeContainer;
protected InstanceWrapper<T> target;
protected boolean stateless;
public ScriptInvoker(String operationName,
AtomicComponent component,
ScopeContainer scopeContainer,
WorkContext workContext) {
this.operationName = operationName;
this.component = component;
this.scopeContainer = scopeContainer;
stateless = Scope.STATELESS == scopeContainer.getScope();
// TODO: support script classes
}
public Object invokeTarget(Object payload, short sequence, WorkContext workContext) throws InvocationTargetException {
Object contextId = workContext.getIdentifier(scopeContainer.getScope());
try {
InstanceWrapper<T> wrapper = getInstance(sequence, contextId);
Invocable scriptEngine = (Invocable)wrapper.getInstance();
Object ret;
if (clazz == null) {
ret = scriptEngine.invokeFunction(operationName, (Object[])payload);
} else {
ret = scriptEngine.invokeMethod(clazz, operationName, (Object[])payload);
}
scopeContainer.returnWrapper(component, wrapper, contextId);
if (sequence == END) {
// if end conversation, remove resource
scopeContainer.remove(component);
}
return ret;
} catch (ScriptException e) {
throw new InvocationTargetException(e);
} catch (ComponentException e) {
throw new InvocationTargetException(e);
}
}
@Override
public ScriptInvoker clone() throws CloneNotSupportedException {
try {
ScriptInvoker invoker = (ScriptInvoker)super.clone();
invoker.target = null;
return invoker;
} catch (CloneNotSupportedException e) {
return null; // will not happen
}
}
/**
* Resolves the target service instance or returns a cached one
*/
protected InstanceWrapper<T> getInstance(short sequence, Object contextId) throws TargetException {
switch (sequence) {
case NONE:
if (cacheable) {
if (target == null) {
target = scopeContainer.getWrapper(component, contextId);
}
return target;
} else {
return scopeContainer.getWrapper(component, contextId);
}
case START:
assert !cacheable;
return scopeContainer.getWrapper(component, contextId);
case CONTINUE:
case END:
assert !cacheable;
return scopeContainer.getAssociatedWrapper(component, contextId);
default:
throw new InvalidConversationSequenceException("Unknown sequence type", String.valueOf(sequence));
}
}
}
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