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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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*/ |
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import java.util.*; |
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import java.util.concurrent.*; |
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import java.util.concurrent.locks.*; |
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|
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/** |
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* This is an incomplete implementation of a wrapper class |
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* that places read-write locks around unsynchronized Maps. |
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* Exists as a sample input for MapLoops test. |
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*/ |
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|
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public class RWMap implements Map { |
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private final Map m; |
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private final ReentrantReadWriteLock rwl = new ReentrantReadWriteLock(); |
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|
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public RWMap(Map m) { |
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if (m == null) |
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throw new NullPointerException(); |
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this.m = m; |
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} |
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|
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public RWMap() { |
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this(new TreeMap()); // use TreeMap by default |
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// this(new IdentityHashMap()); |
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} |
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|
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public int size() { |
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rwl.readLock().lock(); try {return m.size();} finally { rwl.readLock().unlock(); } |
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} |
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public boolean isEmpty(){ |
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rwl.readLock().lock(); try {return m.isEmpty();} finally { rwl.readLock().unlock(); } |
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} |
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|
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public Object get(Object key) { |
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rwl.readLock().lock(); try {return m.get(key);} finally { rwl.readLock().unlock(); } |
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} |
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|
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public boolean containsKey(Object key) { |
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rwl.readLock().lock(); try {return m.containsKey(key);} finally { rwl.readLock().unlock(); } |
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} |
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public boolean containsValue(Object value){ |
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rwl.readLock().lock(); try {return m.containsValue(value);} finally { rwl.readLock().unlock(); } |
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} |
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public Set keySet() { // Not implemented |
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return m.keySet(); |
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} |
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public Set entrySet() { // Not implemented |
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return m.entrySet(); |
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} |
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public Collection values() { // Not implemented |
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return m.values(); |
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} |
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public boolean equals(Object o) { |
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rwl.readLock().lock(); try {return m.equals(o);} finally { rwl.readLock().unlock(); } |
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} |
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public int hashCode() { |
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rwl.readLock().lock(); try {return m.hashCode();} finally { rwl.readLock().unlock(); } |
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} |
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public String toString() { |
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rwl.readLock().lock(); try {return m.toString();} finally { rwl.readLock().unlock(); } |
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} |
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public Object put(Object key, Object value) { |
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rwl.writeLock().lock(); try {return m.put(key, value);} finally { rwl.writeLock().unlock(); } |
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} |
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public Object remove(Object key) { |
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rwl.writeLock().lock(); try {return m.remove(key);} finally { rwl.writeLock().unlock(); } |
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} |
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public void putAll(Map map) { |
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rwl.writeLock().lock(); try {m.putAll(map);} finally { rwl.writeLock().unlock(); } |
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} |
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public void clear() { |
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rwl.writeLock().lock(); try {m.clear();} finally { rwl.writeLock().unlock(); } |
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} |
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|
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} |
