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Diffstat (limited to 'branches/sca-android-r643746/modules/core/src/main/java/org/apache/tuscany/sca/core/invocation/InvocationChainImpl.java')
-rw-r--r-- | branches/sca-android-r643746/modules/core/src/main/java/org/apache/tuscany/sca/core/invocation/InvocationChainImpl.java | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/branches/sca-android-r643746/modules/core/src/main/java/org/apache/tuscany/sca/core/invocation/InvocationChainImpl.java b/branches/sca-android-r643746/modules/core/src/main/java/org/apache/tuscany/sca/core/invocation/InvocationChainImpl.java new file mode 100644 index 0000000000..5c9ae8c706 --- /dev/null +++ b/branches/sca-android-r643746/modules/core/src/main/java/org/apache/tuscany/sca/core/invocation/InvocationChainImpl.java @@ -0,0 +1,189 @@ +/*
+ * 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;
+
+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.Interceptor;
+import org.apache.tuscany.sca.invocation.InvocationChain;
+import org.apache.tuscany.sca.invocation.Invoker;
+import org.apache.tuscany.sca.invocation.DataExchangeSemantics;
+import org.apache.tuscany.sca.invocation.Phase;
+
+/**
+ * Default implementation of an invocation chain
+ *
+ * @version $Rev: 634778 $ $Date: 2008-03-07 10:58:16 -0800 (Fri, 07 Mar 2008) $
+ */
+public class InvocationChainImpl implements InvocationChain {
+ private Operation sourceOperation;
+ private Operation targetOperation;
+ private List<Node> nodes = new ArrayList<Node>();
+
+ // FIXME: Not a good practice to use static reference
+ private final static PhaseManager phaseManager = new PhaseManager();
+ private boolean forReference;
+ private boolean allowsPassByReference;
+
+ public InvocationChainImpl(Operation sourceOperation, Operation targetOperation, boolean forReference) {
+ assert sourceOperation != null;
+ assert targetOperation != null;
+ this.targetOperation = targetOperation;
+ this.sourceOperation = sourceOperation;
+ this.forReference = forReference;
+ }
+
+ public Operation getTargetOperation() {
+ return targetOperation;
+ }
+
+ public void setTargetOperation(Operation operation) {
+ this.targetOperation = operation;
+ }
+
+ public void addInterceptor(Interceptor interceptor) {
+ String phase = forReference ? Phase.REFERENCE : Phase.SERVICE;
+ addInterceptor(phase, interceptor);
+ }
+
+ public void addInvoker(Invoker invoker) {
+ String phase = forReference ? Phase.REFERENCE_BINDING : Phase.IMPLEMENTATION;
+ addInvoker(phase, invoker);
+ }
+
+ public Invoker getHeadInvoker() {
+ return nodes.isEmpty() ? null : nodes.get(0).getInvoker();
+ }
+
+ public Invoker getTailInvoker() {
+ return nodes.isEmpty() ? null : nodes.get(nodes.size() - 1).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(int index, Interceptor interceptor) {
+ addInterceptor(interceptor);
+ }
+
+ 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;
+ }
+
+ public String toString() {
+ return "(" + phaseIndex + ")" + invoker;
+ }
+ }
+
+}
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