1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2002, 2015 Oracle and/or its affiliates. All rights reserved.
*
*/
package com.sleepycat.persist.impl;
import java.io.Serializable;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Map;
import com.sleepycat.compat.DbCompat;
/**
* The btree comparator for persistent key classes. The serialized form of
* this comparator is stored in the BDB JE database descriptor so that the
* comparator can be re-created during recovery.
*
* @author Mark Hayes
*/
public class PersistComparator implements
Comparator<byte[]>, Serializable {
private static final long serialVersionUID = 5221576538843355317L;
private String keyClassName;
private String[] comositeFieldOrder;
private Map<String, String[]> fieldFormatData;
private transient PersistKeyBinding binding;
public PersistComparator(PersistKeyBinding binding) {
this.binding = binding;
/* Save info necessary to recreate binding during deserialization. */
final CompositeKeyFormat format =
(CompositeKeyFormat) binding.keyFormat;
keyClassName = format.getClassName();
comositeFieldOrder = CompositeKeyFormat.getFieldNameArray
(format.getClassMetadata().getCompositeKeyFields());
/* Currently only enum formats have per-class data. */
for (FieldInfo field : format.getFieldInfo()) {
Format fieldFormat = field.getType();
if (fieldFormat.isEnum()) {
EnumFormat enumFormat = (EnumFormat) fieldFormat;
if (fieldFormatData == null) {
fieldFormatData = new HashMap<String, String[]>();
}
fieldFormatData.put(enumFormat.getClassName(),
enumFormat.getFormatData());
}
}
}
/**
* In BDB JE this method will be called after the comparator is
* deserialized, including during recovery. We must construct the binding
* here, without access to the stored catalog since recovery is not
* complete.
*/
public void initialize(ClassLoader loader) {
final Catalog catalog;
if (fieldFormatData == null) {
catalog = new ComparatorCatalog(loader, null);
} else {
final Map<String, Format> enumFormats =
new HashMap<String, Format>();
catalog = new ComparatorCatalog(loader, enumFormats);
for (Map.Entry<String, String[]> entry :
fieldFormatData.entrySet()) {
final String fldClassName = entry.getKey();
final String[] enumNames = entry.getValue();
final Class fldClass;
try {
fldClass = catalog.resolveClass(fldClassName);
} catch (ClassNotFoundException e) {
throw new IllegalStateException(e);
}
enumFormats.put(fldClassName,
new EnumFormat(catalog, fldClass, enumNames));
}
for (Format fldFormat : enumFormats.values()) {
fldFormat.initializeIfNeeded(catalog, null /*model*/);
}
}
final Class keyClass;
try {
keyClass = catalog.resolveClass(keyClassName);
} catch (ClassNotFoundException e) {
throw new IllegalStateException(e);
}
binding = new PersistKeyBinding(catalog, keyClass,
comositeFieldOrder);
}
public int compare(byte[] b1, byte[] b2) {
/*
* In BDB JE, the binding is initialized by the initialize method. In
* BDB, the binding is intialized by the constructor.
*/
if (binding == null) {
throw DbCompat.unexpectedState("Not initialized");
}
try {
Comparable k1 =
(Comparable) binding.bytesToObject(b1, 0, b1.length);
Comparable k2 =
(Comparable) binding.bytesToObject(b2, 0, b2.length);
return k1.compareTo(k2);
} catch (RefreshException e) {
/*
* Refresh is not applicable to PersistComparator, which is used
* during recovery. All field formats used by the comparator are
* guaranteed to be predefined, because they must be primitive or
* primitive wrapper types. So they are always present in the
* catalog, and cannot change as the result of class evolution or
* replication.
*/
throw DbCompat.unexpectedException(e);
}
}
@Override
public String toString() {
StringBuilder b = new StringBuilder();
b.append("[DPL comparator ");
b.append(" keyClassName = ").append(keyClassName);
b.append(" comositeFieldOrder = [");
for (String s : comositeFieldOrder) {
b.append(s).append(',');
}
b.append(']');
b.append(" fieldFormatData = {");
for (Map.Entry<String, String[]> entry : fieldFormatData.entrySet()) {
b.append(entry.getKey()).append(": [");
for (String s : entry.getValue()) {
b.append(s).append(',');
}
b.append(']');
}
b.append('}');
b.append(']');
return b.toString();
}
}
|
