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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.core.invocation.impl;
import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.invocation.DataExchangeSemantics;
import org.apache.tuscany.sca.invocation.Interceptor;
import org.apache.tuscany.sca.invocation.InvocationChain;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Phase;
import org.apache.tuscany.sca.invocation.PhasedInterceptor;
/**
* Default implementation of an invocation chain
*
* @version $Rev$ $Date$
*/
public class InvocationChainImpl implements InvocationChain {
private Operation sourceOperation;
private Operation targetOperation;
private List<Node> nodes = new ArrayList<Node>();
private final PhaseManager phaseManager;
private boolean forReference;
private boolean allowsPassByReference;
public InvocationChainImpl(Operation sourceOperation, Operation targetOperation, boolean forReference, PhaseManager phaseManager) {
this.targetOperation = targetOperation;
this.sourceOperation = sourceOperation;
this.forReference = forReference;
this.phaseManager = phaseManager;
}
public Operation getTargetOperation() {
return targetOperation;
}
public void setTargetOperation(Operation operation) {
this.targetOperation = operation;
}
public void addInterceptor(Interceptor interceptor) {
if (interceptor instanceof PhasedInterceptor) {
PhasedInterceptor pi = (PhasedInterceptor)interceptor;
if (pi.getPhase() != null) {
addInvoker(pi.getPhase(), pi);
return;
}
}
String phase = forReference ? Phase.REFERENCE : Phase.SERVICE;
addInterceptor(phase, interceptor);
}
public void addInvoker(Invoker invoker) {
if (invoker instanceof PhasedInterceptor) {
PhasedInterceptor pi = (PhasedInterceptor)invoker;
if (pi.getPhase() != null) {
addInvoker(pi.getPhase(), pi);
return;
}
}
String phase = forReference ? Phase.REFERENCE_BINDING : Phase.IMPLEMENTATION;
addInvoker(phase, invoker);
}
public Invoker getHeadInvoker() {
return nodes.isEmpty() ? null : nodes.get(0).getInvoker();
}
/**
* @return the sourceOperation
*/
public Operation getSourceOperation() {
return sourceOperation;
}
/**
* @param sourceOperation the sourceOperation to set
*/
public void setSourceOperation(Operation sourceOperation) {
this.sourceOperation = sourceOperation;
}
public void addInterceptor(String phase, Interceptor interceptor) {
addInvoker(phase, interceptor);
}
private void addInvoker(String phase, Invoker invoker) {
int index = phaseManager.getAllPhases().indexOf(phase);
if (index == -1) {
throw new IllegalArgumentException("Invalid phase name: " + phase);
}
Node node = new Node(index, invoker);
ListIterator<Node> li = nodes.listIterator();
Node before = null, after = null;
boolean found = false;
while (li.hasNext()) {
before = after;
after = li.next();
if (after.getPhaseIndex() > index) {
// Move back
li.previous();
li.add(node);
found = true;
break;
}
}
if (!found) {
// Add to the end
nodes.add(node);
before = after;
after = null;
}
// Relink the interceptors
if (before != null) {
if (before.getInvoker() instanceof Interceptor) {
((Interceptor)before.getInvoker()).setNext(invoker);
}
}
if (after != null) {
if (invoker instanceof Interceptor) {
((Interceptor)invoker).setNext(after.getInvoker());
}
}
}
public boolean allowsPassByReference() {
if (allowsPassByReference) {
// No need to check the invokers
return true;
}
// Check if any of the invokers allows pass-by-reference
boolean allowsPBR = false;
for (Node i : nodes) {
if (i.getInvoker() instanceof DataExchangeSemantics) {
if (((DataExchangeSemantics)i.getInvoker()).allowsPassByReference()) {
allowsPBR = true;
break;
}
}
}
return allowsPBR;
}
public void setAllowsPassByReference(boolean allowsPBR) {
this.allowsPassByReference = allowsPBR;
}
private static class Node {
private int phaseIndex;
private Invoker invoker;
public Node(int phaseIndex, Invoker invoker) {
super();
this.phaseIndex = phaseIndex;
this.invoker = invoker;
}
public int getPhaseIndex() {
return phaseIndex;
}
public Invoker getInvoker() {
return invoker;
}
@Override
public String toString() {
return "(" + phaseIndex + ")" + invoker;
}
}
}
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