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java.lang.Object net.spy.memcached.compat.SpyObject net.spy.memcached.CASMutator<T>
public class CASMutator<T>
Object that provides mutation via CAS over a given memcache client.
Example usage (reinventing incr):
// Get or create a client. MemcachedClient client=[...]; // Get a Transcoder. Transcodertc = new LongTranscoder(); // Get a mutator instance that uses that client. CASMutator<Long> mutator=new CASMutator<Long>(client, tc); // Get a mutation that knows what to do when a value is found. CASMutation<Long> mutation=new CASMutation<Long>() { public Long getNewValue(Long current) { return current + 1; } }; // Do a mutation. long currentValue=mutator.cas(someKey, 0L, 0, mutation);
Constructor Summary | |
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CASMutator(MemcachedClientIF c,
Transcoder<T> tc)
Construct a CASMutator that uses the given client. |
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CASMutator(MemcachedClientIF c,
Transcoder<T> tc,
int max_tries)
Construct a CASMutator that uses the given client. |
Method Summary | |
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T |
cas(String key,
T initial,
int initialExp,
CASMutation<T> m)
CAS a new value in for a key. |
Methods inherited from class net.spy.memcached.compat.SpyObject |
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getLogger |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public CASMutator(MemcachedClientIF c, Transcoder<T> tc, int max_tries)
c
- the clienttc
- the Transcoder to usemax_tries
- the maximum number of attempts to get a CAS to succeedpublic CASMutator(MemcachedClientIF c, Transcoder<T> tc)
c
- the clienttc
- the Transcoder to useMethod Detail |
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public T cas(String key, T initial, int initialExp, CASMutation<T> m) throws Exception
Note that if initial is null, this method will only update existing values.
key
- the key to be CASedinitial
- the value to use when the object is not cachedinitialExp
- the expiration time to use when initializingm
- the mutation to perform on an object if a value exists for the
key
Exception
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