Examples of org.jredis.semantics.KeyCodec

org.jredis.semantics.KeyCodec
Encoding and decoding keys is a significant (but not major) performance bottleneck.
A KeyCodec is a {@link String} {@link Codec} that is taskedwith the optimal performance of encoding and decoding String keys for use by connector implementations that support such extended mechanisms.
This interface is projected to be implemented by a key caching mechanism suitable for employment in usage scenarios where a finite set of keys is repeatedly employed to accomplish domain specific tasks.
For example, a common Redis pattern is the use of atomic counters to increment IDs. Whenever this pattern is used, the key for the ID(s) will be repeatedly encoded and decoded by a non-optimized client which can not make indiscriminate decisions regarding such optimizations.
A key cache, implementing {@link KeyCodec}, for example, can be used to indicate to the client that for keys, the default codec (which is basically delegating to {@link String}'s {@link String#getBytes()} and {@link String#String(byte[],int,int)}) should not be used and that the client should use the object implementing this to accomplish the same task.
This is just a marker interface beyond that. @author Joubin Houshyar (alphazero@sensesay.net) @version alpha.0, Apr 15, 2009 @since alpha.0

  private FutureStatus mset(byte[][] mappings){
    Future<Response> futureResponse = this.queueRequest(Command.MSET, mappings);
    return new FutureStatus(futureResponse);
  }
  public FutureStatus mset(Map<String, byte[]> keyValueMap){
    KeyCodec codec = DefaultKeyCodec.provider();
    byte[][] mappings = new byte[keyValueMap.size()*2][];
    int i = 0;
    for (Entry<String, byte[]> e : keyValueMap.entrySet()){
      mappings[i++] = codec.encode(e.getKey());
      mappings[i++] = e.getValue();
    }
    return mset(mappings);
  }

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  private Future<Boolean> msetnx(byte[][] mappings){
    Future<Response> futureResponse = this.queueRequest(Command.MSETNX, mappings);
    return new FutureBoolean(futureResponse);
  }
  public Future<Boolean> msetnx(Map<String, byte[]> keyValueMap){
    KeyCodec codec = DefaultKeyCodec.provider();
    byte[][] mappings = new byte[keyValueMap.size()*2][];
    int i = 0;
    for (Entry<String, byte[]> e : keyValueMap.entrySet()){
      mappings[i++] = codec.encode(e.getKey());
      mappings[i++] = e.getValue();
    }
    return msetnx(mappings);
  }

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public abstract class BulkSetMapping<T> implements KeyValueSet<T>{
  private final Map<String, T> map = new HashMap<String, T>();
  abstract byte[] toBytes(T value) ;
  public byte[][] getMappings () {
    KeyCodec codec = DefaultKeyCodec.provider();
    byte[][] mappings = new byte[map.size()*2][];
    int i = 0;
    for (Entry<String, T> e : map.entrySet()){
      mappings[i++] = codec.encode(e.getKey());
      mappings[i++] = toBytes(e.getValue());
    }
    return mappings;
  }

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      throw new ProviderException("Expecting a ValueResponse here => " + e.getLocalizedMessage(), e);
    }
    return resvalue;
  }
  public boolean msetnx(Map<String, byte[]> keyValueMap) throws RedisException {
    KeyCodec codec = DefaultKeyCodec.provider();
    byte[][] mappings = new byte[keyValueMap.size()*2][];
    int i = 0;
    for (Entry<String, byte[]> e : keyValueMap.entrySet()){
      mappings[i++] = codec.encode(e.getKey());
      mappings[i++] = e.getValue();
    }
    return msetnx(mappings);
  }

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  private void mset(byte[][] mappings) throws RedisException {
    this.serviceRequest(Command.MSET, mappings);
  }
  public void mset(Map<String, byte[]> keyValueMap) throws RedisException {
    KeyCodec codec = DefaultKeyCodec.provider();
    byte[][] mappings = new byte[keyValueMap.size()*2][];
    int i = 0;
    for (Entry<String, byte[]> e : keyValueMap.entrySet()){
      mappings[i++] = codec.encode(e.getKey());
      mappings[i++] = e.getValue();
    }
    mset(mappings);
  }

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Related Classes of org.jredis.semantics.KeyCodec

org.jredis.ri.alphazero.BulkSetMapping

org.jredis.ri.alphazero.JRedisFutureSupport

org.jredis.ri.alphazero.JRedisSupport

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