TimeServiceServerContainer.java

/*******************************************************************************
* Copyright (c) 2015 Composent, Inc. and others. 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
*
* Contributors:
*   Composent, Inc. - initial API and implementation
******************************************************************************/
package com.mycorp.examples.timeservice.internal.provider.rest.host;

import java.io.IOException;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.eclipse.ecf.core.ContainerCreateException;
import org.eclipse.ecf.core.ContainerTypeDescription;
import org.eclipse.ecf.core.IContainer;
import org.eclipse.ecf.core.identity.ID;
import org.eclipse.ecf.core.identity.Namespace;
import org.eclipse.ecf.remoteservice.provider.RemoteServiceContainerInstantiator;
import org.eclipse.ecf.remoteservice.rest.identity.RestNamespace;
import org.eclipse.ecf.remoteservice.servlet.HttpServiceComponent;
import org.eclipse.ecf.remoteservice.servlet.RemoteServiceHttpServlet;
import org.eclipse.ecf.remoteservice.servlet.ServletServerContainer;
import org.json.JSONException;
import org.json.JSONObject;
import org.osgi.service.http.NamespaceException;

import com.mycorp.examples.timeservice.ITimeService;

public class TimeServiceServerContainer extends ServletServerContainer {

	public static final String TIMESERVICE_HOST_CONFIG_NAME = "com.mycorp.examples.timeservice.rest.host";
	public static final String TIMESERVICE_SERVLET_NAME = "/" + ITimeService.class.getName();

	TimeServiceServerContainer(ID id) throws ServletException, NamespaceException {
		super(id);
		// Register our servlet with the given httpService with the
		// TIMESERVICE_SERVLET_NAME
		// which is "/com.mycorp.examples.timeservice.ITimeService"
		TimeServiceHttpServiceComponent.getDefault().registerServlet(TIMESERVICE_SERVLET_NAME,
					new TimeRemoteServiceHttpServlet(), null, null);
	}

	@Override
	public void dispose() {
		TimeServiceHttpServiceComponent.getDefault().unregisterServlet(TIMESERVICE_SERVLET_NAME);
		super.dispose();
	}

	@Override
	public Namespace getConnectNamespace() {
		return RestNamespace.INSTANCE;
	}

	class TimeRemoteServiceHttpServlet extends RemoteServiceHttpServlet {

		private static final long serialVersionUID = 3906126401901826462L;
		// Handle remote time service get call here.
		@Override
		protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
			// Get local OSGi ITimeService
			ITimeService timeService = HttpServiceComponent.getDefault().getService(ITimeService.class);
			// Call local service to get the current time
			Long currentTime = timeService.getCurrentTime();
			// Serialize response and send as http response
			try {
				resp.getOutputStream().print(new JSONObject().put("time", currentTime).toString());
			} catch (JSONException e) {
				throw new ServletException("json response object could not be created for time service", e);
			}
		}
	}
	
	public static class Instantiator extends RemoteServiceContainerInstantiator {
		@Override
		public IContainer createInstance(ContainerTypeDescription description, Map<String, ?> parameters)
				throws ContainerCreateException {
			try {
				return new TimeServiceServerContainer(
						RestNamespace.INSTANCE.createInstance(new Object[] { (String) parameters.get("id") }));
			} catch (Exception e) {
				throw new ContainerCreateException("Could not create time service server", e);
			}
		}

		public String[] getSupportedConfigs(ContainerTypeDescription description) {
			return new String[] { TIMESERVICE_HOST_CONFIG_NAME };
		}
	}
}