/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jena.tdb.base.block;

import java.nio.ByteBuffer ;

import org.apache.jena.atlas.junit.BaseTest ;
import org.junit.AfterClass ;
import org.junit.BeforeClass ;
import org.junit.Test ;

public class TestBlockMgrTracked extends BaseTest
{
    // Mainly testing the tracking

    static boolean b ;

    @BeforeClass
    static public void beforeClass()
    {
        b = BlockMgrTracker.verbose ;
        BlockMgrTracker.verbose = false ;
    }

    @AfterClass
    static public void afterClass()
    {
        BlockMgrTracker.verbose = b ;
    }    
    
    @Test public void track_01()
    {
        BlockMgr mgr = BlockMgrFactory.createMem("BPTRecord", 4) ;
        mgr = BlockMgrFactory.tracker(mgr) ;
        mgr.beginUpdate() ;
        Block block = mgr.allocate(4) ;
        ByteBuffer bb = block.getByteBuffer() ;
        bb.putInt(0,1234) ;
        mgr.write(block) ;
        mgr.release(block) ;
        // -----
        Block block2 = mgr.getRead(block.getId()) ;
        ByteBuffer bb2 = block2.getByteBuffer() ;
        assertArrayEquals(bb.array(), bb2.array()) ;
        mgr.release(block2) ;
        mgr.endUpdate() ;
    }

    // Multiple overlapping read operations.
    static BlockMgr setup()
    {
        BlockMgr mgr = BlockMgrFactory.createMem("BPTRecord", 4) ;
        mgr = BlockMgrFactory.tracker(mgr) ;
        return mgr ;
    }
    
    static void write(BlockMgr mgr, int value)
    {
        mgr.beginUpdate() ;
        Block block = mgr.allocate(4) ;
        ByteBuffer bb = block.getByteBuffer() ;
        bb.putInt(0,value) ;
        mgr.write(block) ;
        mgr.release(block) ;
        mgr.endUpdate() ;
    }
    
    @Test public void track_02()
    {
        BlockMgr mgr = setup() ;
        write(mgr, 1234) ;
        write(mgr, 5678) ;

        mgr.beginRead() ;
        mgr.beginRead() ;

        Block b0 = mgr.getRead(0) ;
        Block b1 = mgr.getRead(1) ;
        
        mgr.release(b1) ;
        mgr.release(b0) ;
        
        mgr.endRead() ;
        mgr.endRead() ;
    }
    
    @Test(expected=BlockException.class)
    public void track_03()
    {
        BlockMgr mgr = setup() ;
        write(mgr, 1234) ;
        write(mgr, 5678) ;

        mgr.beginRead() ;
        Block b0 = mgr.getWrite(0) ;
        mgr.endRead() ;
    }

    @Test(expected=BlockException.class)
    public void track_04()
    {
        BlockMgr mgr = setup() ;
        write(mgr, 1234) ;
        mgr.beginRead() ;
        Block b0 = mgr.getRead(0) ;
        mgr.promote(b0) ;
        mgr.endRead() ;
    }

    @Test(expected=BlockException.class)
    public void track_05()
    {
        BlockMgr mgr = setup() ;
        mgr.beginRead() ;
        mgr.endUpdate() ;
    }

    @Test(expected=BlockException.class)
    public void track_06()
    {
        BlockMgr mgr = setup() ;
        mgr.beginUpdate() ;
        mgr.endRead() ;
    }

}