/*-
 * Copyright (c) 2012 Diamond Light Source Ltd.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */

package uk.ac.diamond.scisoft.analysis;

import gda.observable.IObservable;

import org.eclipse.dawnsci.analysis.api.rpc.IAnalysisRpcHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import uk.ac.diamond.scisoft.analysis.plotserver.RMIPlotServer;
import uk.ac.diamond.scisoft.analysis.plotserver.SimplePlotServer;
import uk.ac.diamond.scisoft.analysis.rpc.AnalysisRpcGenericInstanceDispatcher;

/**
 * Class that provides a PlotServer to the rest of the gui. The PlotServer instance is set by the plugin activator if
 * found as an OSGI registered service.
 * <p>
 * If you want to simply send plot data to the server, use {@link PlotServiceProvider} as using this class is intended
 * for use by the classes which actually do the plotting and need to be notified of changes via the {@link IObservable}
 * mechanism which is implemented by {@link PlotServer} but not {@link PlotService}
 */
public class PlotServerProvider {
	public static final String PLOT_SERVER_NAME = "plot_server";
	private static final Logger logger = LoggerFactory.getLogger(PlotServerProvider.class);
	static PlotServer plotServer;

	public synchronized static PlotServer getExistingPlotServer() {	
		return plotServer;
	}
	
	public synchronized static PlotServer getPlotServer() {
		if (plotServer == null) {
			logger.info("PlotServer instance not set - using local created PlotServer instead");
			try {
				plotServer = new RMIPlotServer();
			} catch (Exception e) {
				logger.info("RMIPlotserver can't be created, using SimplePlotServer instead", e);
				plotServer = new SimplePlotServer();
			}

			if (Boolean.getBoolean("uk.ac.diamond.scisoft.analysis.analysisrpcserverprovider.disable") == false) {
				try {
					// Start the Analysis RPC wrapper around the SDAPlotter
					// This only happens on SDA
					IAnalysisRpcHandler dispatcher = new AnalysisRpcGenericInstanceDispatcher(ISDAPlotter.class,
							SDAPlotterImpl.getDefaultInstance());
					AnalysisRpcServerProvider.getInstance().addHandler(SDAPlotter.class.getSimpleName(), dispatcher);
	
					// Because we are making a "real" PlotServer (as opposed to a proxy to one, such as over Corba)
					// set the PlotService to be the same server, otherwise the PlotService will attempt connection
					// via RMI
					PlotServiceProvider.setPlotService(plotServer);
				} catch (Exception e) {
					logger.error("Error starting Analysis RPC wrapper", e);
				}
			}
		}
		return plotServer;
	}

	public static void setPlotServer(PlotServer plotServer) {
		PlotServerProvider.plotServer = plotServer;
		logger.info("setPlotServer called with plotServer " + plotServer);
	}
}