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Neo4j kernel is a lightweight, embedded Java database designed to store data structured as graphs rather than tables. For more information, see http://neo4j.org.
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/**
 * Copyright (c) 2002-2013 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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, see .
 */
package org.neo4j.kernel.info;

import java.beans.ConstructorProperties;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

public final class LockInfo
{
    private final String resource;
    private final ResourceType type;
    private final int readCount;
    private final int writeCount;
    private final List waitingThreads;
    private final List lockingTransactions;

    @ConstructorProperties( { "resourceType", "resourceId", "readCount", "writeCount", "lockingTransactions",
            "waitingThreads" } )
    public LockInfo( ResourceType type, String resourceId, int readCount, int writeCount,
            List lockingTransactions, List waitingThreads )
    {
        this.type = type;
        this.resource = resourceId;
        this.readCount = readCount;
        this.writeCount = writeCount;
        this.lockingTransactions = new ArrayList( lockingTransactions );
        this.waitingThreads = new ArrayList( waitingThreads );
    }

    public LockInfo( ResourceType type, String resourceId, int readCount, int writeCount,
            Collection locking )
    {
        this.type = type;
        this.resource = resourceId;
        this.readCount = readCount;
        this.writeCount = writeCount;
        this.waitingThreads = new ArrayList();
        this.lockingTransactions = new ArrayList( locking );
        for ( LockingTransaction tx : lockingTransactions )
        {
            if ( tx instanceof WaitingThread )
            {
                waitingThreads.add( (WaitingThread) tx );
            }
        }
    }

    @Override
    public String toString()
    {
        StringBuilder builder = new StringBuilder(  );
        builder.append( "Total lock count: readCount=" + this.getReadCount() + " writeCount="
                + this.getWriteCount() + " for "
                + this.getResourceType().toString( this.getResourceId() ) ).append( "\n" );
        builder.append( "Lock holders:\n" );
        for ( LockingTransaction tle : this.getLockingTransactions() )
        {
            builder.append( tle ).append( "\n" );
        }
        builder.append( "Waiting list:" ).append( "\n" );
        StringBuilder waitList = new StringBuilder();
        String sep = "";
        for ( WaitingThread we : this.getWaitingThreads() )
        {
            waitList.append( sep ).append( we );
            sep = ", ";
        }
        builder.append( waitList ).append( "\n" );

        return builder.toString();
    }

    public ResourceType getResourceType()
    {
        return type;
    }

    public String getResourceId()
    {
        return resource;
    }

    public int getWriteCount()
    {
        return writeCount;
    }

    public int getReadCount()
    {
        return readCount;
    }

    public int getWaitingThreadsCount()
    {
        return waitingThreads.size();
    }

    public List getWaitingThreads()
    {
        return Collections.unmodifiableList( waitingThreads );
    }

    public List getLockingTransactions()
    {
        return Collections.unmodifiableList( lockingTransactions );
    }
}