13 |
|
* that places read-write locks around unsynchronized Maps. |
14 |
|
* Exists as a sample input for MapLoops test. |
15 |
|
*/ |
16 |
< |
public class RWMap implements Map { |
16 |
> |
public class RWMap implements ConcurrentMap { |
17 |
|
private final Map m; |
18 |
|
private final ReentrantReadWriteLock rwl = new ReentrantReadWriteLock(); |
19 |
|
|
103 |
|
finally { l.unlock(); } |
104 |
|
} |
105 |
|
|
106 |
+ |
public Object putIfAbsent(Object key, Object value) { |
107 |
+ |
ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
108 |
+ |
l.lock(); |
109 |
+ |
try { |
110 |
+ |
Object v = m.get(key); |
111 |
+ |
return v == null? m.put(key, value) : v; |
112 |
+ |
} |
113 |
+ |
finally { l.unlock(); } |
114 |
+ |
} |
115 |
+ |
|
116 |
+ |
public boolean replace(Object key, Object oldValue, Object newValue) { |
117 |
+ |
ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
118 |
+ |
l.lock(); |
119 |
+ |
try { |
120 |
+ |
if (m.get(key).equals(oldValue)) { |
121 |
+ |
m.put(key, newValue); |
122 |
+ |
return true; |
123 |
+ |
} |
124 |
+ |
return false; |
125 |
+ |
} |
126 |
+ |
finally { l.unlock(); } |
127 |
+ |
} |
128 |
+ |
|
129 |
+ |
public Object replace(Object key, Object newValue) { |
130 |
+ |
ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
131 |
+ |
l.lock(); |
132 |
+ |
try { |
133 |
+ |
if (m.containsKey(key)) |
134 |
+ |
return m.put(key, newValue); |
135 |
+ |
return null; |
136 |
+ |
} |
137 |
+ |
finally { l.unlock(); } |
138 |
+ |
} |
139 |
+ |
|
140 |
|
public Object remove(Object key) { |
141 |
|
ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
142 |
|
l.lock(); |
144 |
|
finally { l.unlock(); } |
145 |
|
} |
146 |
|
|
147 |
+ |
public boolean remove(Object key, Object value) { |
148 |
+ |
ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
149 |
+ |
l.lock(); |
150 |
+ |
try { |
151 |
+ |
if (m.get(key).equals(value)) { |
152 |
+ |
m.remove(key); |
153 |
+ |
return true; |
154 |
+ |
} |
155 |
+ |
return false; |
156 |
+ |
} |
157 |
+ |
finally { l.unlock(); } |
158 |
+ |
} |
159 |
+ |
|
160 |
|
public void putAll(Map map) { |
161 |
|
ReentrantReadWriteLock.WriteLock l = rwl.writeLock(); |
162 |
|
l.lock(); |