1 /***
2 *
3 * Copyright 2004 Protique Ltd
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 **/
18 package org.codehaus.activemq.store.bdb;
19
20 import com.sleepycat.je.Cursor;
21 import com.sleepycat.je.CursorConfig;
22 import com.sleepycat.je.Database;
23 import com.sleepycat.je.DatabaseEntry;
24 import com.sleepycat.je.DatabaseException;
25 import com.sleepycat.je.LockMode;
26 import com.sleepycat.je.OperationStatus;
27 import org.apache.commons.logging.Log;
28 import org.apache.commons.logging.LogFactory;
29 import org.codehaus.activemq.message.ActiveMQXid;
30 import org.codehaus.activemq.service.Transaction;
31 import org.codehaus.activemq.service.TransactionManager;
32 import org.codehaus.activemq.service.impl.XATransactionCommand;
33 import org.codehaus.activemq.store.PreparedTransactionStore;
34
35 import javax.jms.JMSException;
36 import javax.transaction.xa.XAException;
37 import java.io.IOException;
38 import java.util.ArrayList;
39 import java.util.List;
40
41 /***
42 * @version $Revision: 1.2 $
43 */
44 public class BDbPreparedTransactionStore implements PreparedTransactionStore {
45 private static final Log log = LogFactory.getLog(BDbMessageStore.class);
46
47 private Database database;
48 private CursorConfig cursorConfig;
49
50 public BDbPreparedTransactionStore(Database database) {
51 this.database = database;
52 }
53
54 public ActiveMQXid[] getXids() throws XAException {
55 checkClosed();
56 Cursor cursor = null;
57 try {
58 cursor = database.openCursor(BDbHelper.getTransaction(), cursorConfig);
59 List list = new ArrayList();
60 DatabaseEntry keyEntry = new DatabaseEntry();
61 DatabaseEntry valueEntry = new DatabaseEntry();
62 OperationStatus status = cursor.getFirst(keyEntry, valueEntry, LockMode.DEFAULT);
63 while (status == OperationStatus.SUCCESS) {
64 list.add(extractXid(keyEntry));
65
66 }
67 if (status != OperationStatus.NOTFOUND) {
68 log.warn("Unexpected status code while recovering: " + status);
69 }
70 ActiveMQXid[] answer = new ActiveMQXid[list.size()];
71 list.toArray(answer);
72 return answer;
73 }
74 catch (DatabaseException e) {
75 log.error("Failed to recover prepared transaction log: " + e, e);
76 throw new XAException("Failed to recover prepared transaction log. Reason: " + e);
77 }
78 catch (IOException e) {
79 log.error("Failed to recover prepared transaction log: " + e, e);
80 throw new XAException("Failed to recover prepared transaction log. Reason: " + e);
81 }
82 finally {
83 if (cursor != null) {
84 try {
85 cursor.close();
86 }
87 catch (DatabaseException e) {
88 log.warn("Caught exception closing cursor: " + e, e);
89 }
90 }
91 }
92 }
93
94 public void remove(ActiveMQXid xid) throws XAException {
95 checkClosed();
96 try {
97 DatabaseEntry key = new DatabaseEntry(asBytes(xid));
98 OperationStatus status = database.delete(BDbHelper.getTransaction(), key);
99 if (status != OperationStatus.SUCCESS) {
100 log.error("Could not delete sequenece number for: " + xid + " status: " + status);
101 }
102 }
103 catch (DatabaseException e) {
104 throw new XAException("Failed to remove prepared transaction: " + xid + ". Reason: " + e);
105 }
106 catch (IOException e) {
107 throw new XAException("Failed to remove prepared transaction: " + xid + ". Reason: " + e);
108 }
109 }
110
111 public void put(ActiveMQXid xid, Transaction transaction) throws XAException {
112 checkClosed();
113 try {
114 DatabaseEntry key = new DatabaseEntry(asBytes(xid));
115 DatabaseEntry value = new DatabaseEntry(asBytes(transaction));
116 database.put(BDbHelper.getTransaction(), key, value);
117 }
118 catch (Exception e) {
119 throw new XAException("Failed to store prepared transaction: " + xid + ". Reason: " + e);
120 }
121 }
122
123 public void loadPreparedTransactions(TransactionManager transactionManager) throws XAException {
124 checkClosed();
125 Cursor cursor = null;
126 try {
127 cursor = database.openCursor(BDbHelper.getTransaction(), cursorConfig);
128 DatabaseEntry keyEntry = new DatabaseEntry();
129 DatabaseEntry valueEntry = new DatabaseEntry();
130 OperationStatus status = cursor.getFirst(keyEntry, valueEntry, LockMode.DEFAULT);
131 while (status == OperationStatus.SUCCESS) {
132 ActiveMQXid xid = extractXid(keyEntry);
133 Transaction transaction = extractTransaction(valueEntry);
134 transactionManager.loadTransaction(xid, transaction);
135 status = cursor.getNext(keyEntry, valueEntry, LockMode.DEFAULT);
136 }
137 if (status != OperationStatus.NOTFOUND) {
138 log.warn("Unexpected status code while recovering: " + status);
139 }
140 }
141 catch (Exception e) {
142 log.error("Failed to recover prepared transaction log: " + e, e);
143 throw new XAException("Failed to recover prepared transaction log. Reason: " + e);
144 }
145 finally {
146 if (cursor != null) {
147 try {
148 cursor.close();
149 }
150 catch (DatabaseException e) {
151 log.warn("Caught exception closing cursor: " + e, e);
152 }
153 }
154 }
155 }
156
157 public void start() throws JMSException {
158 }
159
160 public synchronized void stop() throws JMSException {
161 if (database != null) {
162 JMSException exception = BDbPersistenceAdapter.closeDatabase(database, null);
163 database = null;
164 if (exception != null) {
165 throw exception;
166 }
167 }
168 }
169
170
171
172 protected ActiveMQXid extractXid(DatabaseEntry entry) throws IOException {
173 return ActiveMQXid.fromBytes(entry.getData());
174 }
175
176 protected Transaction extractTransaction(DatabaseEntry entry) throws IOException, ClassNotFoundException {
177 return XATransactionCommand.fromBytes(entry.getData());
178 }
179
180
181 private byte[] asBytes(ActiveMQXid xid) throws IOException {
182 return xid.toBytes();
183 }
184
185 private byte[] asBytes(Transaction transaction) throws IOException, JMSException {
186 if (transaction instanceof XATransactionCommand) {
187 XATransactionCommand packetTask = (XATransactionCommand) transaction;
188 return packetTask.toBytes();
189 }
190 else {
191 throw new IOException("Unsupported transaction type: " + transaction);
192 }
193 }
194
195 protected void checkClosed() throws XAException {
196 if (database == null) {
197 throw new XAException("Prepared Transaction Store is already closed");
198 }
199 }
200 }