1 /***
2 *
3 * Copyright 2004 Hiram Chirino
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.journal.impl;
19
20 import java.io.ByteArrayInputStream;
21 import java.io.ByteArrayOutputStream;
22 import java.io.DataInputStream;
23 import java.io.DataOutputStream;
24 import java.io.IOException;
25
26 /***
27 * Serializes/Deserializes Mark records. When a mark is set in the journal, a Mark record
28 * must be journaled so that on restart the Journal knows what was the last mark.
29 *
30 * @version $Revision: 1.1 $
31 */
32 class Mark {
33
34 public static final int MARK_RECORD_SIZE = 12;
35
36 public long sequenceId;
37 public int offsetId;
38
39 public Mark() {}
40 public Mark(RecordLocationImpl location) {
41 sequenceId = location.getSequenceId();
42 offsetId = location.getSegmentOffset();
43 }
44
45 public byte[] writeExternal() throws IOException {
46 ByteArrayOutputStream stream = new ByteArrayOutputStream(16);
47 DataOutputStream os = new DataOutputStream(stream);
48 os.writeLong(sequenceId);
49 os.writeInt(offsetId);
50 os.close();
51 return stream.toByteArray();
52 }
53
54 public void readExternal(byte data[]) throws IOException {
55 DataInputStream is = new DataInputStream(new ByteArrayInputStream(data));
56 sequenceId = is.readLong();
57 offsetId = is.readInt();
58 is.close();
59 }
60 /***
61 * @param mark
62 */
63 public void copy(Mark mark) {
64 this.offsetId = mark.offsetId;
65 this.sequenceId = mark.sequenceId;
66 }
67
68 }