| /* |
| * 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.openejb.core.ivm; |
| |
| import java.io.Externalizable; |
| import java.io.IOException; |
| import java.io.InvalidObjectException; |
| import java.io.ObjectInput; |
| import java.io.ObjectOutput; |
| import java.io.ObjectStreamException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| public class IntraVmArtifact implements Externalizable { |
| |
| private static final Handles staticHandles = new Handles() { |
| @Override |
| public synchronized int add(Object obj) { |
| return super.add(obj); |
| } |
| @Override |
| public synchronized Object get(int id) { |
| return super.get(id); |
| } |
| }; |
| |
| private static final ThreadLocal<Handles> threadHandles = new ThreadLocal<Handles>() { |
| protected Handles initialValue() { |
| return new Handles(); |
| } |
| }; |
| |
| // todo why not put in message catalog? |
| private static final String NO_ARTIFACT_ERROR = "The artifact this object represents could not be found."; |
| |
| private int instanceHandle; |
| private boolean staticArtifact; |
| |
| public IntraVmArtifact(Object obj) { |
| this(obj, false); |
| } |
| |
| public IntraVmArtifact(Object obj, boolean storeStatically) { |
| this.staticArtifact = storeStatically; |
| Handles handles = getHandles(storeStatically); |
| instanceHandle = handles.add(obj); |
| } |
| |
| private static Handles getHandles(boolean staticArtifact) { |
| return (staticArtifact) ? staticHandles : threadHandles.get(); |
| } |
| |
| public IntraVmArtifact() { |
| } |
| |
| public void writeExternal(ObjectOutput out) throws IOException { |
| out.writeBoolean(staticArtifact); |
| out.write(instanceHandle); |
| } |
| |
| public void readExternal(ObjectInput in) throws IOException { |
| staticArtifact = in.readBoolean(); |
| instanceHandle = in.read(); |
| } |
| |
| protected Object readResolve() throws ObjectStreamException { |
| Handles handles = getHandles(staticArtifact); |
| Object artifact = handles.get(instanceHandle); |
| if (artifact == null) throw new InvalidObjectException(NO_ARTIFACT_ERROR + instanceHandle); |
| return artifact; |
| } |
| |
| private static class Handles { |
| private List<Object> list = new ArrayList<Object>(); |
| |
| public int add(Object obj) { |
| int id = list.size(); |
| list.add(obj); |
| return id; |
| } |
| |
| public Object get(int id) { |
| Object obj = list.get(id); |
| // todo WHY? |
| if (list.size() == id + 1) { |
| list.clear(); |
| } |
| return obj; |
| } |
| } |
| } |