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

    // 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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    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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   */
  private void removePermEntryInCache(PermissionsDescriptor perm)
    throws StandardException
  {
    // Remove cached permissions entry if present
    Cacheable cacheEntry = getPermissionsCache().findCached( perm);
    if (cacheEntry != null)
      getPermissionsCache().remove(cacheEntry);
  }

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  }


    private Object getPermissions( PermissionsDescriptor key) throws StandardException
    {
        // RESOLVE get a READ COMMITTED (shared) lock on the permission row
        Cacheable entry = getPermissionsCache().find( key);
        if( entry == null)
            return null;
        Object perms = entry.getIdentity();
        getPermissionsCache().release( entry);
        return perms;
    }

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            }
        }
        // Remove cached permissions data. The cache may hold permissions data for this key even if
        // the row in the permissions table is new. In that case the cache may have an entry indicating no
        // permissions
        Cacheable cacheEntry = getPermissionsCache().findCached( perm);
        if( cacheEntry != null)
            getPermissionsCache().remove( cacheEntry);


        //If we are dealing with grant, then the caller does not need to send 
        //any invalidation actions to anyone and hence return false

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   */
  private void removePermEntryInCache(PermissionsDescriptor perm)
    throws StandardException
  {
    // Remove cached permissions entry if present
    Cacheable cacheEntry = getPermissionsCache().findCached( perm);
    if (cacheEntry != null)
      getPermissionsCache().remove(cacheEntry);
  }

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  }


    private Object getPermissions( PermissionsDescriptor key) throws StandardException
    {
        // RESOLVE get a READ COMMITTED (shared) lock on the permission row
        Cacheable entry = getPermissionsCache().find( key);
        if( entry == null)
            return null;
        Object perms = entry.getIdentity();
        getPermissionsCache().release( entry);
        return perms;
    }

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            getLanguageConnectionFactory().getStatementCache();


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

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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

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