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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.sca.implementation.osgi.invocation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;
import org.apache.tuscany.sca.core.context.InstanceWrapper;
import org.apache.tuscany.sca.core.invocation.TargetInvocationException;
import org.apache.tuscany.sca.core.invocation.ThreadMessageContext;
import org.apache.tuscany.sca.core.scope.Scope;
import org.apache.tuscany.sca.core.scope.ScopeContainer;
import org.apache.tuscany.sca.core.scope.ScopedRuntimeComponent;
import org.apache.tuscany.sca.core.scope.TargetResolutionException;
import org.apache.tuscany.sca.interfacedef.ConversationSequence;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.interfacedef.java.impl.JavaInterfaceUtil;
import org.apache.tuscany.sca.invocation.InvocationChain;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.runtime.EndpointReference;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
import org.apache.tuscany.sca.runtime.RuntimeComponentService;
/**
* Java->OSGi references use OSGiTargetInvoker to call methods from OSGi bundles
* OSGi->Java references use JDKProxyService and invocation handler and do not use this class
* OSGi->OSGi references go through OSGi reference mechanisms when a proxy is not used
* When a proxy is used, this invoker is used to call methods from OSGi bundles
* A proxy is used for OSGi->OSGi if
* 1) target reference properties are specified OR
* 2) there are one or more non-blocking methods in the target interface OR
* 3) scope is not COMPOSITE
*/
public class OSGiTargetInvoker<T> implements Invoker {
private Operation operation;
protected InstanceWrapper<T> target;
protected boolean stateless;
protected boolean cacheable;
private final RuntimeComponentService service;
private final ScopeContainer scopeContainer;
public OSGiTargetInvoker(
Operation operation,
RuntimeComponent component,
RuntimeComponentService service) {
this.operation = operation;
this.service = service;
this.scopeContainer = ((ScopedRuntimeComponent) component).getScopeContainer();
this.cacheable = true;
stateless = Scope.STATELESS == scopeContainer.getScope();
}
/**
* Resolves the target service instance or returns a cached one
*/
protected InstanceWrapper getInstance(ConversationSequence sequence, Object contextId)
throws TargetResolutionException, TargetInvocationException {
if (sequence == null) {
if (cacheable) {
if (target == null) {
target = scopeContainer.getWrapper(contextId);
}
return target;
} else {
return scopeContainer.getWrapper(contextId);
}
} else {
switch (sequence) {
case CONVERSATION_START:
assert !cacheable;
return scopeContainer.getWrapper(contextId);
case CONVERSATION_CONTINUE:
case CONVERSATION_END:
assert !cacheable;
return scopeContainer.getAssociatedWrapper(contextId);
default:
throw new TargetInvocationException("Unknown sequence type: " + String.valueOf(sequence));
}
}
}
private Object invokeTarget(Message msg) throws InvocationTargetException {
ConversationSequence sequence = msg.getConversationSequence();
Object contextId = ThreadMessageContext.getMessageContext().getConversationID();
EndpointReference from = ThreadMessageContext.getMessageContext().getFrom();
try {
OSGiInstanceWrapper wrapper = (OSGiInstanceWrapper)getInstance(sequence, contextId);
Object instance;
if (service != null)
instance = wrapper.getInstance(service);
else
instance = wrapper.getCallbackInstance(from, operation.getInterface());
Method m = JavaInterfaceUtil.findMethod(instance.getClass(), operation);
Object ret = invokeMethod(instance, m, msg);
scopeContainer.returnWrapper(wrapper, contextId);
if (sequence == ConversationSequence.CONVERSATION_END) {
// if end conversation, remove resource
scopeContainer.remove(contextId);
}
return ret;
} catch (InvocationTargetException e) {
throw e;
} catch (Exception e) {
throw new InvocationTargetException(e);
}
}
protected Object invokeMethod(Object instance,
Method m,
Message msg)
throws InvocationTargetException {
try {
Object payload = msg.getBody();
if (payload != null && !payload.getClass().isArray()) {
return m.invoke(instance, payload);
} else {
return m.invoke(instance, (Object[]) payload);
}
} catch (InvocationTargetException e) {
throw e;
} catch (Exception e) {
throw new InvocationTargetException(e);
}
}
public Message invoke(Message msg) {
try {
Object messageId = msg.getMessageID();
Message workContext = ThreadMessageContext.getMessageContext();
if (messageId != null) {
workContext.setCorrelationID(messageId);
}
Object resp = invokeTarget(msg);
msg.setBody(resp);
} catch (InvocationTargetException e) {
msg.setFaultBody(e.getCause());
}
return msg;
}
public boolean isCacheable() {
return cacheable;
}
public void setCacheable(boolean cacheable) {
this.cacheable = cacheable;
}
protected InvocationChain getInvocationChain(List<InvocationChain> chains, Operation targetOperation) {
for (InvocationChain chain : chains) {
if (chain.getTargetOperation().equals(targetOperation)) {
return chain;
}
}
return null;
}
}
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