Examples of org.apache.derby.iapi.services.cache.Cacheable

Package org.apache.derby.iapi.services.cache

Examples of org.apache.derby.iapi.services.cache.Cacheable

org.apache.derby.iapi.services.cache.Cacheable
Any object that implements this interface can be cached using the services of the CacheManager/CacheFactory. In addition to implementing this interface the class must be public and it must have a public no-arg constructor. This is because the cache manager will construct objects itself and then set their identity by calling the setIdentity method.
A Cacheable object has five states:
While the object is kept it is guaranteed not to change identity. While it is unkept no-one outside of the cache manager can have a reference to the object. The cache manager returns kept objects and they return to the unkept state when all the current users of the object have released it.
It is required that the object can only move into a dirty state while it is kept.
MT - Mutable : thread aware - Calls to Cacheable method must only be made by the cache manager or the object itself. @see CacheManager @see CacheFactory @see Class#newInstance

        stat.findFault++;


        return addEntry(item, key, false, (Object) null);
      }
        
      Cacheable entry = item.use();
      if (entry == null) {
        // item was not added by the other user successfully ...
        synchronized (this) {
          item.unkeep();
        }

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        stat.findCachedHit++;
      
      item.keepAfterSearch();
    }


    Cacheable entry = item.use();
    if (entry == null) {
      // item was not added by the other user successfully ...
      synchronized (this) {
        item.unkeep();
      }

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            System.out.println("memoryLeakTrace:Cache:" + name + " " + size());
        }
      }
    }


    Cacheable entry = addEntry(item, key, true, createParameter);
  
    if (SanityManager.DEBUG) {
      if (entry != null)
        SanityManager.ASSERT(item.getEntry() == entry);
    }

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  */
  private Cacheable addEntry(CachedItem item, Object key, boolean forCreate, Object createParameter)
    throws StandardException {


    Cacheable entry = null;
        long origEntrySize = 0;
        if( useByteCount)
            origEntrySize = getItemSize( item);


    try
    {
      if (SanityManager.DEBUG) {
        if (SanityManager.DEBUG_ON(ClockFactory.CacheTrace))
        {
        SanityManager.DEBUG(ClockFactory.CacheTrace, name + 
                  " item " + item + " take on identity " + key);
        }
      }
      
      // tell the object it needs to create itself
      entry = item.takeOnIdentity(this, holderFactory, key, forCreate, createParameter);
    }
    finally
    {
      boolean  notifyWaiters;
      synchronized (this) {


        Object removed = remove(key);
        if (SanityManager.DEBUG) {
          SanityManager.ASSERT(removed == item);
        }


        if (entry != null) {
          // put the actual key into the hash table, not the one that was passed in
          // for the find or create. This is because the caller may re-use the key
          // for another cache operation, which would corrupt our hashtable
          put(entry.getIdentity(), item);
                    if( useByteCount)
                        currentByteCount += ((SizedCacheable) entry).getSize() - origEntrySize;
          item.setValidState(true);
                    validItemCount++;
          notifyWaiters = true;

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     * @param operator
     */
    public void scan( Matchable filter, Operator operator)
    {
        int itemCount = 1;
        Cacheable entry = null;
        CachedItem item = null;


        // Do not call the operator while holding the synchronization lock.
        // However we cannot access an item's links without holding the synchronization lock,
        // nor can we assume that an item is still in the cache unless we hold the synchronization

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    throws StandardException {


    if (statementCache == null)
      return;
 
      Cacheable cachedItem = statementCache.findCached(statement);
      if (cachedItem != null)
        statementCache.remove(cachedItem);
  }

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    // statement caching disable when in DDL mode
    if (dataDictionaryInWriteMode()) {
      return null;
    }


    Cacheable cachedItem = statementCache.find(statement);


    CachedStatement cs = (CachedStatement) cachedItem;




    GenericPreparedStatement ps = cs.getPreparedStatement();

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        }
    }


  public Cacheable createIdentity( Object key, Object createParameter ) throws StandardException
  {
        Cacheable cacheable = this;


        //
        // The createParameter arg is unused.
        //
        return cacheable.setIdentity( key );
  }

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  public Cacheable takeOnIdentity(CacheManager cm, CacheableFactory holderFactory,
    Object key, boolean forCreate, Object createParameter)
    throws StandardException {


    // tell the object it needs to create itself
    Cacheable oldEntry = entry;
    if (oldEntry == null)
      oldEntry = holderFactory.newCacheable(cm);


    if (forCreate) {
      entry = oldEntry.createIdentity(key, createParameter);
    } else {
      entry = oldEntry.setIdentity(key);
    }


    if (entry != null) {
      // item was found or created
      if (SanityManager.DEBUG) {

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            getLanguageConnectionFactory().getStatementCache();


    if (statementCache == null)
      return;
 
        Cacheable cachedItem = statementCache.findCached(statement);
        // No need to do anything if the statement is already removed
        if (cachedItem != null) {
            CachedStatement cs = (CachedStatement) cachedItem;
            if (statement.getPreparedStatement() != cs.getPreparedStatement()) {
                // DERBY-3786: Someone else has removed the statement from

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org.apache.derby.impl.services.cache.CachedItem

org.apache.derby.impl.services.cache.Clock

org.apache.derby.impl.services.cache.ClockPolicy

org.apache.derby.impl.services.cache.ConcurrentCache

org.apache.derby.impl.sql.catalog.DataDictionaryImpl

org.apache.derby.impl.sql.catalog.SequenceUpdater

org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext

org.apache.derby.impl.store.raw.data.BaseDataFileFactory

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