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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.runtime;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import org.apache.tuscany.sca.core.context.InstanceWrapper;
import org.apache.tuscany.sca.core.invocation.TargetInvocationException;
import org.apache.tuscany.sca.core.scope.Scope;
import org.apache.tuscany.sca.core.scope.ScopeContainer;
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.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.runtime.EndpointReference;
import org.apache.tuscany.sca.runtime.ReferenceParameters;
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
*
* @version $Rev$ $Date$
*/
public class OSGiTargetInvoker<T> implements Invoker {
private Operation operation;
protected InstanceWrapper<T> target;
private final OSGiImplementationProvider provider;
private final RuntimeComponentService service;
// Scope container is reset by the OSGi implementation provider if @Scope
// annotation is used to modify the scope (default is composite)
// Hence this field is initialized on the first invoke.
private ScopeContainer scopeContainer;
public OSGiTargetInvoker(
Operation operation,
OSGiImplementationProvider provider,
RuntimeComponentService service) {
this.operation = operation;
this.service = service;
this.provider = provider;
}
/**
* Resolves the target service instance or returns a cached one
*/
@SuppressWarnings("unchecked")
protected InstanceWrapper getInstance(Object contextId)
throws TargetResolutionException, TargetInvocationException {
if (scopeContainer == null)
scopeContainer = provider.getScopeContainer();
return scopeContainer.getWrapper(contextId);
}
@SuppressWarnings("unchecked")
private Object invokeTarget(Message msg) throws InvocationTargetException {
if (scopeContainer == null)
scopeContainer = provider.getScopeContainer();
Operation op = msg.getOperation();
if (op == null) {
op = this.operation;
}
ConversationSequence sequence = op.getConversationSequence();
Object contextId = null;
EndpointReference from = msg.getFrom();
ReferenceParameters parameters = null;
if (from != null) {
parameters = from.getReferenceParameters();
}
// check what sort of context is required
if (scopeContainer != null) {
Scope scope = scopeContainer.getScope();
if (scope == Scope.REQUEST) {
contextId = Thread.currentThread();
} else if (scope == Scope.CONVERSATION && parameters != null) {
contextId = parameters.getConversationID();
}
}
try {
OSGiInstanceWrapper wrapper = (OSGiInstanceWrapper)getInstance(contextId);
Object instance;
// detects whether the scope container has created a conversation Id. This will
// happen in the case that the component has conversational scope but only the
// callback interface is conversational. Or in the callback case if the service interface
// is conversational and the callback interface isn't. If we are in this situation we need
// to get the contextId of this component and remove it after we have invoked the method on
// it. It is possible that the component instance will not go away when it is removed below
// because a callback conversation will still be holding a reference to it
boolean removeTemporaryConversationalComponentAfterCall = false;
if (parameters != null && (contextId == null) && (parameters.getConversationID() != null)) {
contextId = parameters.getConversationID();
removeTemporaryConversationalComponentAfterCall = true;
}
instance = wrapper.getInstance(service);
Method m = JavaInterfaceUtil.findMethod(instance.getClass(), operation);
Object ret = invokeMethod(instance, m, msg);
scopeContainer.returnWrapper(wrapper, contextId);
if ((sequence == ConversationSequence.CONVERSATION_END) || (removeTemporaryConversationalComponentAfterCall)) {
// if end conversation, or we have the special case where a conversational
// object was created to service the stateless half of a stateful component
scopeContainer.remove(contextId);
parameters.setConversationID(null);
}
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;
}
}
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