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Library for Tango Server (ie. Tango Device) in Java
There is a newer version: 10.0.0
/**
 * Copyright (C) :     2012
 *
 * 	Synchrotron Soleil
 * 	L'Orme des merisiers
 * 	Saint Aubin
 * 	BP48
 * 	91192 GIF-SUR-YVETTE CEDEX
 *
 * This file is part of Tango.
 *
 * Tango is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Tango 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Tango.  If not, see .
 */
package org.tango.server.device;

import java.util.HashMap;
import java.util.Map;

import org.tango.server.annotation.TransactionType;

/**
 * Manage a tango device synchronization.
 * 
 * @see TransactionType
 * @author ABEILLE
 * 
 */
public final class DeviceLocker {
    /**
     * Lock for attributes
     */
    private final Object attributeLock;
    /**
     * Lock for commands
     */
    private final Object commandLock;
    /**
     * Lock for server
     */
    private static final Object SERVER_LOCK = new Object();
    /**
     * Lock for classes
     */
    private static final Map, Object> CLASS_LOCKS = new HashMap, Object>();

    private final TransactionType txType;

    /**
     * Ctr
     * 
     * @param txType
     *            lock type
     * @param deviceClass
     *            the class to lock
     */
    public DeviceLocker(final TransactionType txType, final Class deviceClass) {
        this.txType = txType;
        switch (txType) {
            case DEVICE:
                attributeLock = new Object();
                commandLock = attributeLock;
                break;
            case ATTRIBUTE:
                attributeLock = new Object();
                commandLock = null;
                break;
            case COMMAND:
                commandLock = new Object();
                attributeLock = null;
                break;
            case CLASS:
                if (CLASS_LOCKS.containsKey(deviceClass)) {
                    commandLock = CLASS_LOCKS.get(deviceClass);
                    attributeLock = commandLock;
                } else {
                    commandLock = new Object();
                    attributeLock = commandLock;
                    CLASS_LOCKS.put(deviceClass, commandLock);
                }
                break;
            case SERVER:
                attributeLock = SERVER_LOCK;
                commandLock = SERVER_LOCK;
                break;
            case ATTRIBUTE_COMMAND:
                attributeLock = new Object();
                commandLock = new Object();
                break;
            case NONE:
            default:
                attributeLock = null;
                commandLock = null;
                break;
        }
    }

    public Object getAttributeLock() {
        return attributeLock;
    }

    public Object getCommandLock() {
        return commandLock;
    }

    public TransactionType getTxType() {
        return txType;
    }

}