/* 
 * Copyright (c) 2008 Stiftung Deutsches Elektronen-Synchrotron, 
 * Member of the Helmholtz Association, (DESY), HAMBURG, GERMANY.
 *
 * THIS SOFTWARE IS PROVIDED UNDER THIS LICENSE ON AN "../AS IS" BASIS. 
 * WITHOUT WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED 
 * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE AND 
 * NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE 
 * FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR 
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. SHOULD THE SOFTWARE PROVE DEFECTIVE 
 * IN ANY RESPECT, THE USER ASSUMES THE COST OF ANY NECESSARY SERVICING, REPAIR OR 
 * CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. 
 * NO USE OF ANY SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER.
 * DESY HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, 
 * OR MODIFICATIONS.
 * THE FULL LICENSE SPECIFYING FOR THE SOFTWARE THE REDISTRIBUTION, MODIFICATION, 
 * USAGE AND OTHER RIGHTS AND OBLIGATIONS IS INCLUDED WITH THE DISTRIBUTION OF THIS 
 * PROJECT IN THE FILE LICENSE.HTML. IF THE LICENSE IS NOT INCLUDED YOU MAY FIND A COPY 
 * AT HTTP://WWW.DESY.DE/LEGAL/LICENSE.HTM
 */
package org.csstudio.platform.internal.simpledal.local;

import org.csstudio.dal.Timestamp;
import org.csstudio.platform.ExecutionService;
import org.csstudio.platform.internal.simpledal.AbstractConnector;
import org.csstudio.platform.internal.simpledal.converters.ConverterUtil;
import org.csstudio.platform.model.pvs.IProcessVariableAddress;
import org.csstudio.platform.model.pvs.ValueType;
import org.csstudio.platform.simpledal.ConnectionState;
import org.csstudio.platform.simpledal.IProcessVariableValueListener;
import org.csstudio.platform.simpledal.IProcessVariableWriteListener;
import org.csstudio.platform.simpledal.SettableState;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Local Connectors are connected to a simulated channels that live in the local
 * JVM.
 * 
 * See {@link LocalChannelPool}.
 * 
 * @author Sven Wende
 * 
 */
@SuppressWarnings("unchecked")
public class LocalConnector extends AbstractConnector implements ILocalChannelListener {
	
    private static final Logger LOG = LoggerFactory.getLogger(LocalConnector.class);

	/**
	 * Constructor.
	 */
	public LocalConnector(IProcessVariableAddress pvAddress, ValueType valueType) {
		super(pvAddress, valueType);
		assert valueType != null;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void valueChanged(Object value) {
		doForwardValue(value, new Timestamp());
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected void doGetValueAsynchronously(final IProcessVariableValueListener listener) {
		Runnable r = new Runnable() {
			@Override
			public void run() {
				Object value = LocalChannelPool.getInstance().getChannel(getProcessVariableAddress(), getValueType()).getValue();
				try {
				    listener.valueChanged(ConverterUtil.convert(value, getValueType()), new Timestamp());
				}catch(NumberFormatException nfe) {
				    LOG.warn(nfe.toString());
				}
			}
		};

		ExecutionService.getInstance().executeWithNormalPriority(r);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected Object doGetValueSynchronously() {
		Object value = LocalChannelPool.getInstance().getChannel(getProcessVariableAddress(), getValueType()).getValue();
		return value;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected void doGetCharacteristicAsynchronously(String characteristicId, ValueType valueType, IProcessVariableValueListener listener)
			throws Exception {
		doGetValueAsynchronously(listener);

	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected Object doGetCharacteristicSynchronously(String characteristicId, ValueType valueType) throws Exception {
		return doGetValueSynchronously();
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected void doSetValueAsynchronously(final Object value, final IProcessVariableWriteListener listener) {
		Runnable r = new Runnable() {
			@Override
			public void run() {
				LocalChannelPool.getInstance().getChannel(getProcessVariableAddress(), getValueType()).setValue(value);

				if (listener != null) {
					listener.success();
				}
			}
		};

		ExecutionService.getInstance().executeWithNormalPriority(r);

	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected boolean doSetValueSynchronously(Object value) {
		LocalChannelPool.getInstance().getChannel(getProcessVariableAddress(), getValueType()).setValue(value);
		return true;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected void doInit() {
		LocalChannelPool.getInstance().getChannel(getProcessVariableAddress(), getValueType()).addListener(this);
		forwardConnectionState(ConnectionState.CONNECTED);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected void doDispose() {
		LocalChannelPool.getInstance().getChannel(getProcessVariableAddress(), getValueType()).removeListener(this);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected SettableState doIsSettable() {
		return SettableState.SETTABLE;
	}

}