org.tango.server.cache.StateStatusCacheEntryFactory Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of JTangoServer Show documentation
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.cache;

import fr.esrf.Tango.DevFailed;
import net.sf.ehcache.constructs.blocking.CacheEntryFactory;
import org.tango.server.InvocationContext;
import org.tango.server.InvocationContext.CallType;
import org.tango.server.InvocationContext.ContextType;
import org.tango.server.attribute.AttributeImpl;
import org.tango.server.attribute.AttributeValue;
import org.tango.server.command.CommandImpl;
import org.tango.server.device.AroundInvokeImpl;
import org.tango.server.device.DeviceLocker;
import org.tango.server.events.EventManager;

public final class StateStatusCacheEntryFactory implements CacheEntryFactory {
    private static final double NANO_TO_MILLI = 1000000.0;
    private final CommandImpl command;
    private final AttributeImpl attribute;
    private final DeviceLocker deviceLock;
    private final String deviceName;
    private final AroundInvokeImpl aroundInvoke;
    private long lastUpdateTime;

    public StateStatusCacheEntryFactory(final CommandImpl command, final AttributeImpl attribute,
                                        final DeviceLocker deviceLock, final String deviceName, final AroundInvokeImpl aroundInvoke) {
        this.deviceLock = deviceLock;
        this.command = command;
        this.attribute = attribute;
        this.deviceName = deviceName;
        this.aroundInvoke = aroundInvoke;
    }

    @Override
    public Object createEntry(final Object key) throws DevFailed {

        Object result = null;
        final Object lock = deviceLock.getAttributeLock();
        synchronized (lock != null ? lock : new Object()) {
            aroundInvoke.aroundInvoke(new InvocationContext(ContextType.PRE_READ_ATTRIBUTE, CallType.POLLING, null,
                    attribute.getName()));
            attribute.lock();
            try {
                final long time1 = System.nanoTime();
                attribute.updateValue();
                final long now = System.nanoTime();
                final long nowMilli = System.currentTimeMillis();
                final long deltaTime = now - lastUpdateTime;
                lastUpdateTime = now;
                final long executionDuration = lastUpdateTime - time1;
                attribute.setPollingStats(executionDuration / NANO_TO_MILLI, nowMilli, deltaTime / NANO_TO_MILLI);
                command.setPollingStats(executionDuration / NANO_TO_MILLI, nowMilli, deltaTime / NANO_TO_MILLI);
                attribute.addToHistory();
                result = attribute.getReadValue();
                command.addToHistory(((AttributeValue) result).getValue());
                EventManager.getInstance().pushAttributeValueEvent(deviceName, attribute.getName(), true);
            } catch (final DevFailed e) {
                command.addErrorToHistory(e);
                attribute.addErrorToHistory(e);
                EventManager.getInstance().pushAttributeErrorEvent(deviceName, attribute.getName(), e, true);
                throw e;
            } finally {
                attribute.unlock();
                aroundInvoke.aroundInvoke(new InvocationContext(ContextType.POST_READ_ATTRIBUTE, CallType.POLLING,
                        null, attribute.getName()));
            }
        }// synchronized
        return result;
    }

}