001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.activemq.kaha.impl.async;
018
019 import java.io.IOException;
020
021 import org.apache.activemq.kaha.Marshaller;
022 import org.apache.activemq.kaha.StoreLocation;
023 import org.apache.activemq.kaha.impl.data.RedoListener;
024 import org.apache.activemq.util.ByteSequence;
025 import org.apache.activemq.util.DataByteArrayInputStream;
026 import org.apache.activemq.util.DataByteArrayOutputStream;
027
028 /**
029 * Provides a Kaha DataManager Facade to the DataManager.
030 *
031 *
032 */
033 public final class DataManagerFacade implements org.apache.activemq.kaha.impl.DataManager {
034
035 private static final ByteSequence FORCE_COMMAND = new ByteSequence(new byte[] {'F', 'O', 'R', 'C', 'E'});
036
037 private AsyncDataManager dataManager;
038 private final String name;
039 private Marshaller redoMarshaller;
040
041 private static class StoreLocationFacade implements StoreLocation {
042 private final Location location;
043
044 public StoreLocationFacade(Location location) {
045 this.location = location;
046 }
047
048 public int getFile() {
049 return location.getDataFileId();
050 }
051
052 public long getOffset() {
053 return location.getOffset();
054 }
055
056 public int getSize() {
057 return location.getSize();
058 }
059
060 public Location getLocation() {
061 return location;
062 }
063 }
064
065 public DataManagerFacade(AsyncDataManager dataManager, String name) {
066 this.dataManager = dataManager;
067 this.name = name;
068 }
069
070 private static StoreLocation convertToStoreLocation(Location location) {
071 if (location == null) {
072 return null;
073 }
074 return new StoreLocationFacade(location);
075 }
076
077 private static Location convertFromStoreLocation(StoreLocation location) {
078
079 if (location == null) {
080 return null;
081 }
082
083 if (location.getClass() == StoreLocationFacade.class) {
084 return ((StoreLocationFacade)location).getLocation();
085 }
086
087 Location l = new Location();
088 l.setOffset((int)location.getOffset());
089 l.setSize(location.getSize());
090 l.setDataFileId(location.getFile());
091 return l;
092 }
093
094
095 public Object readItem(Marshaller marshaller, StoreLocation location) throws IOException {
096 ByteSequence sequence = dataManager.read(convertFromStoreLocation(location));
097 DataByteArrayInputStream dataIn = new DataByteArrayInputStream(sequence);
098 return marshaller.readPayload(dataIn);
099 }
100
101 public StoreLocation storeDataItem(Marshaller marshaller, Object payload) throws IOException {
102 final DataByteArrayOutputStream buffer = new DataByteArrayOutputStream();
103 marshaller.writePayload(payload, buffer);
104 ByteSequence data = buffer.toByteSequence();
105 return convertToStoreLocation(dataManager.write(data, (byte)1, false));
106 }
107
108 public void force() throws IOException {
109 dataManager.write(FORCE_COMMAND, (byte)2, true);
110 }
111
112 public void updateItem(StoreLocation location, Marshaller marshaller, Object payload) throws IOException {
113 final DataByteArrayOutputStream buffer = new DataByteArrayOutputStream();
114 marshaller.writePayload(payload, buffer);
115 ByteSequence data = buffer.toByteSequence();
116 dataManager.update(convertFromStoreLocation(location), data, false);
117 }
118
119 public void close() throws IOException {
120 dataManager.close();
121 }
122
123 public void consolidateDataFiles() throws IOException {
124 dataManager.consolidateDataFiles();
125 }
126
127 public boolean delete() throws IOException {
128 return dataManager.delete();
129 }
130
131 public void addInterestInFile(int file) throws IOException {
132 dataManager.addInterestInFile(file);
133 }
134
135 public void removeInterestInFile(int file) throws IOException {
136 dataManager.removeInterestInFile(file);
137 }
138
139 public void recoverRedoItems(RedoListener listener) throws IOException {
140 throw new RuntimeException("Not Implemented..");
141 }
142
143 public StoreLocation storeRedoItem(Object payload) throws IOException {
144 throw new RuntimeException("Not Implemented..");
145 }
146
147 public Marshaller getRedoMarshaller() {
148 return redoMarshaller;
149 }
150
151 public void setRedoMarshaller(Marshaller redoMarshaller) {
152 this.redoMarshaller = redoMarshaller;
153 }
154
155 public String getName() {
156 return name;
157 }
158
159 }