Examples of com.google.common.collect.MapMaker$StrategyImpl

com.google.common.collect.MapMaker
A {@link ConcurrentMap} builder, providing any combination of thesefeatures: {@linkplain SoftReference soft} or {@linkplain WeakReference weak} keys, soft or weak values, timed expiration, and on-demandcomputation of values. Usage example:
```
  {@code ConcurrentMap graphs = new MapMaker() .concurrencyLevel(32) .softKeys() .weakValues() .expiration(30, TimeUnit.MINUTES) .makeComputingMap(}new Function()  public Graph apply(Key key) { return createExpensiveGraph(key); } });}
```
These features are all optional; {@code new MapMaker().makeMap()}returns a valid concurrent map that behaves exactly like a {@link ConcurrentHashMap}. The returned map is implemented as a hash table with similar performance characteristics to {@link ConcurrentHashMap}. It supports all optional operations of the {@code ConcurrentMap} interface. It does not permitnull keys or values. It is serializable; however, serializing a map that uses soft or weak references can give unpredictable results.
Note: by default, the returned map uses equality comparisons (the {@link Object#equals(Object) equals} method) to determine equalityfor keys or values. However, if {@link #weakKeys()} or {@link #softKeys()} was specified, the map uses identity ({@code ==}) comparisons instead for keys. Likewise, if {@link #weakValues()} or{@link #softValues()} was specified, the map uses identity comparisonsfor values.
The returned map has weakly consistent iteration: an iterator over one of the map's view collections may reflect some, all or none of the changes made to the map after the iterator was created.
An entry whose key or value is reclaimed by the garbage collector immediately disappears from the map. (If the default settings of strong keys and strong values are used, this will never happen.) The client can never observe a partially-reclaimed entry. Any {@link java.util.Map.Entry}instance retrieved from the map's {@linkplain Map#entrySet() entry set}is snapshot of that entry's state at the time of retrieval.
{@code new MapMaker().weakKeys().makeMap()} can almost always beused as a drop-in replacement for {@link java.util.WeakHashMap}, adding concurrency, asynchronous cleanup, identity-based equality for keys, and great flexibility. @author Bob Lee @author Kevin Bourrillion

    }


    private void pumpTheHeap( int ops, byte[] payload )
    {


        ConcurrentMap<String, byte[]> test = new MapMaker().concurrencyLevel( 4 ).makeMap();


        logger.info( Ram.inMb( ops * payload.length ) + " in " + ops + " slices to store" );


        double started = System.currentTimeMillis();

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    @Test
    public void withMap()
    {


        ConcurrentMap<Long, Pointer<Object>> map = new MapMaker().concurrencyLevel( 4 ).initialCapacity( 500000 ).makeMap();


        String str = "This is the string to store into the off-heap memory";


        int size = str.length();
        int howMany = 1000000;

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    public void close() {}


    public StorageEngine<ByteArray, byte[], byte[]> getStore(StoreDefinition storeDef,
                                                             RoutingStrategy strategy) {
        ConcurrentMap<ByteArray, List<Versioned<byte[]>>> backingMap = new MapMaker().softValues()
                                                                                     .makeMap();
        return new InMemoryStorageEngine<ByteArray, byte[], byte[]>(storeDef.getName(), backingMap);
    }

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  private static class SimpleXAResourceProducer implements XAResourceProducer {
    private static final long serialVersionUID = 1L;
    private transient Map<XAResource, XAResourceHolder> xaresHolders = createXAResHoldersMap();


    private static final Map<XAResource, XAResourceHolder> createXAResHoldersMap() {
      return new MapMaker().weakKeys().weakValues().makeComputingMap(
        new Function<XAResource, XAResourceHolder>() {
          public XAResourceHolder apply(XAResource xares) {
            return createResHolder(xares);
          }
        }

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        thread = new Thread(this, "Receiver");
        // TODO avoid starting the thread here
        thread.start();


        streams = new MapMaker().makeMap();
    }

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    /** Save stream keyed by app id and stream id. */
    void addStream(Stream<? extends Event> stream) {
        int appId = stream.getApp().getId();
        Map<String, Stream<? extends Event>> appMap = streams.get(appId);
        if (appMap == null) {
            appMap = new MapMaker().makeMap();
            streams.put(appId, appMap);
        }
        appMap.put(stream.getName(), stream);
    }

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            public ProcessingElement load(String key) throws Exception {
                return createPE(key);
            }
        });


        triggers = new MapMaker().makeMap();


        /*
         * Only the PE Prototype uses the constructor. The PEPrototype field will be cloned by the instances and point
         * to the prototype.
         */

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    LazyStriped(int stripes, Supplier<L> supplier) {
      super(stripes);
      this.size = (mask == ALL_SET) ? Integer.MAX_VALUE : mask + 1;
      this.supplier = supplier;
      this.locks = new MapMaker().weakValues().makeMap();
    }

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   * Hook into the post load event in JPA to take the database fields and load
   * the transient fields prior to making the object available to java.
   */
  @PostLoad
  public void loadTransientFields() {
    templateParams = new MapMaker().makeMap();
    for (Entry<String, ActivityTemplateParamsDb> e : templateParamsDb
        .entrySet()) {
      templateParams.put(e.getKey(), e.getValue().value);
    }
  }

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  /**
   * set the state of the object after load
   */
  @PostLoad
  public void postLoad() {
    values = new MapMaker().makeMap();
    for (Entry<String, ApplicationDataMapValueDb> e : valuesDb.entrySet()) {
      values.put(e.getKey(), e.getValue().getValue());
    }
  }

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