IGISTLocalManager.java example

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/**

Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016.  All rights reserved.

Contact:
     SYSTAP, LLC DBA Blazegraph
     2501 Calvert ST NW #106
     Washington, DC 20008
     licenses@blazegraph.com

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
/*
 * Created on July 17, 2014
 */
package com.bigdata.journal;

import com.bigdata.btree.Checkpoint;
import com.bigdata.btree.ICheckpointProtocol;
import com.bigdata.btree.IIndex;
import com.bigdata.btree.ILocalBTreeView;
import com.bigdata.btree.IndexMetadata;
import com.bigdata.rawstore.IRawStore;

/**
 * Interface for managing local (non-distributed) generalized search trees
 * (GiST). 
 * 
 * @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
 * 
 * @see <a href="https://sourceforge.net/apps/trac/bigdata/ticket/585" > GIST
 *      </a>
 */
public interface IGISTLocalManager extends IGISTManager {

    /**
     * Method creates and registers a named persistence capable data structure.
     * 
     * @param name
     *            The name of the index.
     * @param metadata
     *            The metadata that describes the data structure to be created.
     * 
     * @return The persistence capable data structure.
     * 
     * @see IGISTManager#registerIndex(IndexMetadata)
     * @see Checkpoint#create(IRawStore, IndexMetadata)
     */
    ICheckpointProtocol register(String name, IndexMetadata metadata); // GIST

    /**
     * Return the mutable view of the named persistence capable data structure
     * (aka the "live" or {@link ITx#UNISOLATED} view).
     * <p>
     * Note: {@link IIndexManager#getIndex(String)} delegates to this method and
     * then casts the result to an {@link IIndex}. This is the core
     * implementation to access an existing named index.
     * 
     * @return The mutable view of the persistence capable data structure.
     * 
     * @see IIndexManager#getIndex(String)
     * 
     * @see <a href="https://sourceforge.net/apps/trac/bigdata/ticket/585" >
     *      GIST </a>
     */
    ICheckpointProtocol getUnisolatedIndex(String name); // GIST

    /**
     * Core implementation for access to historical index views.
     * <p>
     * Note: Transactions should pass in the timestamp against which they are
     * reading rather than the transaction identifier (aka startTime). By
     * providing the timestamp of the commit point, the transaction will hit the
     * index cache on the journal. If the transaction passes the startTime
     * instead, then all startTimes will be different and the cache will be
     * defeated.
     * 
     * @throws UnsupportedOperationException
     *             If you pass in {@link ITx#UNISOLATED},
     *             {@link ITx#READ_COMMITTED}, or a timestamp that corresponds
     *             to a read-write transaction since those are not "commit
     *             times".
     * 
     * @see IIndexStore#getIndex(String, long)
     * 
     * @see <a href="http://sourceforge.net/apps/trac/bigdata/ticket/546" > Add
     *      cache for access to historical index views on the Journal by name
     *      and commitTime. </a>
     * 
     * @see <a href="https://sourceforge.net/apps/trac/bigdata/ticket/585" >
     *      GIST </a>
     * 
     *      FIXME GIST : Reconcile with
     *      {@link IResourceManager#getIndex(String, long)}. They are returning
     *      types that do not overlap ({@link ICheckpointProtocol} and
     *      {@link ILocalBTreeView}). This is blocking the support of GIST in
     *      {@link AbstractTask}.
     */
    ICheckpointProtocol getIndexLocal(String name, long commitTime); // GIST

}