Examples of org.apache.commons.collections.map.LRUMap

Package org.apache.commons.collections.map

Examples of org.apache.commons.collections.map.LRUMap

org.apache.commons.collections.map.LRUMap
A Map implementation with a fixed maximum size which removes the least recently used entry if an entry is added when full.
The least recently used algorithm works on the get and put operations only. Iteration of any kind, including setting the value by iteration, does not change the order. Queries such as containsKey and containsValue or access via views also do not change the order.
The map implements OrderedMap and entries may be queried using the bidirectional OrderedMapIterator. The order returned is least recently used to most recently used. Iterators from map views can also be cast to OrderedIterator if required.
All the available iterators can be reset back to the start by casting to ResettableIterator and calling reset(). @since Commons Collections 3.0 (previously in main package v1.0) @version $Revision: 1.14 $ $Date: 2004/06/07 22:13:53 $ @author James Strachan @author Morgan Delagrange @author Stephen Colebourne @author Mike Pettypiece @author Mario Ivankovits

  private static final Logger log = Logger.getLogger(VisibilityFilter.class);
  
  public VisibilityFilter(Authorizations authorizations, byte[] defaultVisibility) {
    this.ve = new VisibilityEvaluator(authorizations);
    this.defaultVisibility = new Text(defaultVisibility);
    this.cache = new LRUMap(1000);
    this.tmpVis = new Text();
  }

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      IOUtils.cleanup(LOG, localFS);
    }
    LOG.info("Using leveldb path " + dbPath);
    db = factory.open(new File(dbPath.toString()), options);
    startTimeWriteCache =
        Collections.synchronizedMap(new LRUMap(getStartTimeWriteCacheSize(
            conf)));
    startTimeReadCache =
        Collections.synchronizedMap(new LRUMap(getStartTimeReadCacheSize(
            conf)));


    if (conf.getBoolean(YarnConfiguration.TIMELINE_SERVICE_TTL_ENABLE, true)) {
      deletionThread = new EntityDeletionThread(conf);
      deletionThread.start();

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      if (_log.isDebugEnabled()) {
        _log.debug("Can't restore view state : session expired");
      }
    } else {
      synchronized (session) {
        LRUMap viewStates = (LRUMap) externalContext.getSessionMap()
            .get(VIEW_STATES_MAP);
        if (null != viewStates) {
          LRUMap logicalStates = (LRUMap) viewStates.get(viewId);
          if (null != logicalStates) {
            if (null != id) {
              restoredState = (Object[]) logicalStates.get(id);
              externalContext.getRequestMap().put(VIEW_SEQUENCE,
                  id);
              if (null == restoredState) {
                if (_log.isDebugEnabled()) {
                  _log
                      .debug("No saved view state found for a Id "
                          + id
                          + ". Restore last saved state");
                }
                restoredState = (Object[]) logicalStates
                    .get(logicalStates.lastKey());
              }
            } else {
              if (_log.isDebugEnabled()) {
                _log
                    .debug("No version Id for a saved view state in request. Restore last saved state");
              }
              restoredState = (Object[]) logicalStates
                  .get(logicalStates.lastKey());
            }
          } else if (_log.isDebugEnabled()) {
            _log
                .debug("Can't restore view state : no saved states for a ViewId "
                    + viewId);

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    SerializedView serializedView;
    UIViewRoot viewRoot = context.getViewRoot();
    ExternalContext externalContext = context.getExternalContext();
    Object session = externalContext.getSession(true);
    synchronized (session) {
      LRUMap viewStates = (LRUMap) externalContext.getSessionMap().get(
          VIEW_STATES_MAP);
      if (null == viewStates) {
        viewStates = new LRUMap(getNumberOfViews(externalContext));
        externalContext.getSessionMap()
            .put(VIEW_STATES_MAP, viewStates);
      }
      Object id = getNextViewId(context);
      LRUMap logicalViewsMap = (LRUMap) viewStates.get(viewRoot
          .getViewId());
      if (null == logicalViewsMap) {
        logicalViewsMap = new LRUMap(getNumberOfViews(externalContext));
      }
      // Renew last seen view.
      viewStates.put(viewRoot.getViewId(), logicalViewsMap);
      logicalViewsMap.put(id, new Object[] { treeStructure, state });
      serializedView = new SerializedView(id, null);
    }
    return serializedView;
  }

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  public Client parse(String agentString) {
    if (agentString == null) {
      return null;
    }
    if (cacheClient == null) {
      cacheClient = new LRUMap(CACHE_SIZE);
    }
    Client client = cacheClient.get(agentString);
    if (client != null) {
      return client;
    }

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  public UserAgent parseUserAgent(String agentString) {
    if (agentString == null) {
      return null;
    }
    if (cacheUserAgent == null) {
      cacheUserAgent = new LRUMap(CACHE_SIZE);
    }
    UserAgent userAgent = cacheUserAgent.get(agentString);
    if (userAgent != null) {
      return userAgent;
    }

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  public Device parseDevice(String agentString) {
    if (agentString == null) {
      return null;
    }
    if (cacheDevice == null) {
      cacheDevice = new LRUMap(CACHE_SIZE);
    }
    Device device = cacheDevice.get(agentString);
    if (device != null) {
      return device;
    }

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    if (agentString == null) {
      return null;
    }


    if (cacheOS == null) {
      cacheOS = new LRUMap(CACHE_SIZE);
    }
    OS os = cacheOS.get(agentString);
    if (os != null) {
      return os;
    }

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    public MapQueryCache() {
        this(DEFAULT_CACHE_SIZE);
    }


    public MapQueryCache(int maxSize) {
        this.map = new LRUMap(maxSize);
    }

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        threadCache = new InheritableThreadLocal<Map<String, CacheEntry>>(){
            @Override
            protected Map<String, CacheEntry> initialValue(){
                // Bug 51942 - this map may be used from multiple threads
                @SuppressWarnings("unchecked") // LRUMap is not generic currently
                Map<String, CacheEntry> map = new LRUMap(getMaxSize());
                return Collections.<String, CacheEntry>synchronizedMap(map);
            }
        };
    }

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