1 |
dl |
1.2 |
/* |
2 |
|
|
* Written by Doug Lea with assistance from members of JCP JSR-166 |
3 |
|
|
* Expert Group and released to the public domain, as explained at |
4 |
jsr166 |
1.7 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
5 |
dl |
1.2 |
*/ |
6 |
dl |
1.1 |
import java.util.*; |
7 |
|
|
import java.util.concurrent.*; |
8 |
|
|
import java.util.concurrent.locks.*; |
9 |
|
|
|
10 |
|
|
/** |
11 |
|
|
* This is an incomplete implementation of a wrapper class |
12 |
|
|
* that places read-write locks around unsynchronized Maps. |
13 |
|
|
* Exists as a sample input for MapLoops test. |
14 |
|
|
*/ |
15 |
dl |
1.9 |
public class RWMap implements ConcurrentMap { |
16 |
dl |
1.1 |
private final Map m; |
17 |
|
|
private final ReentrantReadWriteLock rwl = new ReentrantReadWriteLock(); |
18 |
jsr166 |
1.5 |
|
19 |
dl |
1.1 |
public RWMap(Map m) { |
20 |
|
|
if (m == null) |
21 |
|
|
throw new NullPointerException(); |
22 |
|
|
this.m = m; |
23 |
|
|
} |
24 |
|
|
|
25 |
jsr166 |
1.5 |
public RWMap() { |
26 |
dl |
1.1 |
this(new TreeMap()); // use TreeMap by default |
27 |
jsr166 |
1.5 |
// this(new IdentityHashMap()); |
28 |
dl |
1.1 |
} |
29 |
|
|
|
30 |
|
|
public int size() { |
31 |
jsr166 |
1.8 |
ReentrantReadWriteLock.ReadLock l = rwl.readLock(); |
32 |
jsr166 |
1.6 |
l.lock(); |
33 |
|
|
try { return m.size(); } |
34 |
|
|
finally { l.unlock(); } |
35 |
dl |
1.1 |
} |
36 |
jsr166 |
1.6 |
|
37 |
|
|
public boolean isEmpty() { |
38 |
jsr166 |
1.8 |
ReentrantReadWriteLock.ReadLock l = rwl.readLock(); |
39 |
jsr166 |
1.6 |
l.lock(); |
40 |
|
|
try { return m.isEmpty(); } |
41 |
|
|
finally { l.unlock(); } |
42 |
dl |
1.1 |
} |
43 |
|
|
|
44 |
|
|
public Object get(Object key) { |
45 |
jsr166 |
1.8 |
ReentrantReadWriteLock.ReadLock l = rwl.readLock(); |
46 |
jsr166 |
1.6 |
l.lock(); |
47 |
|
|
try { return m.get(key); } |
48 |
|
|
finally { l.unlock(); } |
49 |
dl |
1.1 |
} |
50 |
|
|
|
51 |
|
|
public boolean containsKey(Object key) { |
52 |
jsr166 |
1.8 |
ReentrantReadWriteLock.ReadLock l = rwl.readLock(); |
53 |
jsr166 |
1.6 |
l.lock(); |
54 |
|
|
try { return m.containsKey(key); } |
55 |
|
|
finally { l.unlock(); } |
56 |
dl |
1.1 |
} |
57 |
jsr166 |
1.6 |
|
58 |
|
|
public boolean containsValue(Object value) { |
59 |
jsr166 |
1.8 |
ReentrantReadWriteLock.ReadLock l = rwl.readLock(); |
60 |
jsr166 |
1.6 |
l.lock(); |
61 |
|
|
try { return m.containsValue(value); } |
62 |
|
|
finally { l.unlock(); } |
63 |
dl |
1.1 |
} |
64 |
|
|
|
65 |
|
|
public Set keySet() { // Not implemented |
66 |
|
|
return m.keySet(); |
67 |
|
|
} |
68 |
jsr166 |
1.5 |
|
69 |
dl |
1.1 |
public Set entrySet() { // Not implemented |
70 |
|
|
return m.entrySet(); |
71 |
|
|
} |
72 |
jsr166 |
1.5 |
|
73 |
dl |
1.1 |
public Collection values() { // Not implemented |
74 |
|
|
return m.values(); |
75 |
|
|
} |
76 |
jsr166 |
1.5 |
|
77 |
dl |
1.1 |
public boolean equals(Object o) { |
78 |
jsr166 |
1.8 |
ReentrantReadWriteLock.ReadLock l = rwl.readLock(); |
79 |
jsr166 |
1.6 |
l.lock(); |
80 |
|
|
try { return m.equals(o); } |
81 |
|
|
finally { l.unlock(); } |
82 |
dl |
1.1 |
} |
83 |
jsr166 |
1.6 |
|
84 |
dl |
1.1 |
public int hashCode() { |
85 |
jsr166 |
1.8 |
ReentrantReadWriteLock.ReadLock l = rwl.readLock(); |
86 |
jsr166 |
1.6 |
l.lock(); |
87 |
|
|
try { return m.hashCode(); } |
88 |
|
|
finally { l.unlock(); } |
89 |
dl |
1.1 |
} |
90 |
jsr166 |
1.6 |
|
91 |
dl |
1.1 |
public String toString() { |
92 |
jsr166 |
1.8 |
ReentrantReadWriteLock.ReadLock l = rwl.readLock(); |
93 |
jsr166 |
1.6 |
l.lock(); |
94 |
|
|
try { return m.toString(); } |
95 |
|
|
finally { l.unlock(); } |
96 |
dl |
1.1 |
} |
97 |
|
|
|
98 |
|
|
public Object put(Object key, Object value) { |
99 |
jsr166 |
1.8 |
ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
100 |
jsr166 |
1.6 |
l.lock(); |
101 |
|
|
try { return m.put(key, value); } |
102 |
|
|
finally { l.unlock(); } |
103 |
dl |
1.1 |
} |
104 |
jsr166 |
1.6 |
|
105 |
dl |
1.9 |
public Object putIfAbsent(Object key, Object value) { |
106 |
|
|
ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
107 |
|
|
l.lock(); |
108 |
jsr166 |
1.10 |
try { |
109 |
dl |
1.9 |
Object v = m.get(key); |
110 |
jsr166 |
1.11 |
return (v == null) ? m.put(key, value) : v; |
111 |
dl |
1.9 |
} |
112 |
|
|
finally { l.unlock(); } |
113 |
|
|
} |
114 |
|
|
|
115 |
|
|
public boolean replace(Object key, Object oldValue, Object newValue) { |
116 |
|
|
ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
117 |
|
|
l.lock(); |
118 |
jsr166 |
1.10 |
try { |
119 |
dl |
1.9 |
if (m.get(key).equals(oldValue)) { |
120 |
|
|
m.put(key, newValue); |
121 |
|
|
return true; |
122 |
|
|
} |
123 |
|
|
return false; |
124 |
|
|
} |
125 |
|
|
finally { l.unlock(); } |
126 |
|
|
} |
127 |
|
|
|
128 |
|
|
public Object replace(Object key, Object newValue) { |
129 |
|
|
ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
130 |
|
|
l.lock(); |
131 |
jsr166 |
1.10 |
try { |
132 |
dl |
1.9 |
if (m.containsKey(key)) |
133 |
|
|
return m.put(key, newValue); |
134 |
|
|
return null; |
135 |
|
|
} |
136 |
|
|
finally { l.unlock(); } |
137 |
|
|
} |
138 |
|
|
|
139 |
dl |
1.1 |
public Object remove(Object key) { |
140 |
jsr166 |
1.8 |
ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
141 |
jsr166 |
1.6 |
l.lock(); |
142 |
|
|
try { return m.remove(key); } |
143 |
|
|
finally { l.unlock(); } |
144 |
dl |
1.1 |
} |
145 |
jsr166 |
1.6 |
|
146 |
dl |
1.9 |
public boolean remove(Object key, Object value) { |
147 |
|
|
ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
148 |
|
|
l.lock(); |
149 |
jsr166 |
1.10 |
try { |
150 |
dl |
1.9 |
if (m.get(key).equals(value)) { |
151 |
|
|
m.remove(key); |
152 |
|
|
return true; |
153 |
|
|
} |
154 |
|
|
return false; |
155 |
|
|
} |
156 |
|
|
finally { l.unlock(); } |
157 |
|
|
} |
158 |
|
|
|
159 |
dl |
1.1 |
public void putAll(Map map) { |
160 |
jsr166 |
1.8 |
ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
161 |
jsr166 |
1.6 |
l.lock(); |
162 |
|
|
try { m.putAll(map); } |
163 |
|
|
finally { l.unlock(); } |
164 |
dl |
1.1 |
} |
165 |
jsr166 |
1.6 |
|
166 |
dl |
1.1 |
public void clear() { |
167 |
jsr166 |
1.8 |
ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
168 |
jsr166 |
1.6 |
l.lock(); |
169 |
|
|
try { m.clear(); } |
170 |
|
|
finally { l.unlock(); } |
171 |
dl |
1.1 |
} |
172 |
jsr166 |
1.5 |
|
173 |
dl |
1.1 |
} |