/*
 * 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.rpc.internal;

import org.eclipse.dawnsci.analysis.api.rpc.AnalysisRpcException;
import org.eclipse.dawnsci.analysis.api.rpc.IAnalysisRpcHandler;

import uk.ac.diamond.scisoft.analysis.rpc.AnalysisRpcServer;
import uk.ac.diamond.scisoft.analysis.rpc.flattening.IRootFlattener;

/**
 * @see AnalysisRpcServerHandler
 */
public class AnalysisRpcServerHandlerImpl implements AnalysisRpcServerHandler {
	private final AnalysisRpcServer analysisRPC;

	public AnalysisRpcServerHandlerImpl(AnalysisRpcServer analysisRPC) {
		this.analysisRPC = analysisRPC;
	}

	private Object handler_common(String destination, Object[] args,
			boolean debug, boolean suspend) {
		IRootFlattener flattener = analysisRPC.getFlattener();
		try {
			IAnalysisRpcHandler handler = analysisRPC
					.getDestination(destination);
			if (handler == null) {
				throw new AnalysisRpcException("No handler registered for "
						+ destination);
			}
			Object[] unflattened = new Object[args.length];
			for (int i = 0; i < args.length; i++) {
				unflattened[i] = flattener.unflatten(args[i]);
			}
			Object ret = handler.run(unflattened);
			Object flatret = flattener.flatten(ret);
			return flatret;
		} catch (Exception e) {
			return flattener.flatten(e);
		}
	}

	@Override
	public Object handler(String destination, Object[] args) {
		return handler_common(destination, args, false, false);
	}

	@Override
	public Object handler_debug(String destination, Object[] args,
			boolean suspend) {
		return handler_common(destination, args, true, suspend);

	}

	@Override
	public Object is_alive() {
		// this method does nothing. Simply successfully running as an RPC call
		// determines if alive
		return true;
	}
}