org.jclouds.samples.googleappengine.GetAllContainersController.java Source code

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Here is the source code for org.jclouds.samples.googleappengine.GetAllContainersController.java

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/**
 *
 * Copyright (C) 2009 Cloud Conscious, LLC. <info@cloudconscious.com>
 *
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 */
package org.jclouds.samples.googleappengine;

import java.io.IOException;
import java.util.Map;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeoutException;

import javax.annotation.Resource;
import javax.inject.Inject;
import javax.inject.Singleton;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.jclouds.blobstore.BlobStoreContext;
import org.jclouds.logging.Logger;
import org.jclouds.samples.googleappengine.functions.BlobStoreContextToContainerResult;

import com.google.common.collect.Iterables;
import com.google.common.collect.Sets;

/**
 * Shows an example of how to use @{link BlobStoreContext} injected with Guice.
 * 
 * @author Adrian Cole
 */
@Singleton
public class GetAllContainersController extends HttpServlet {
    private static final long serialVersionUID = 1L;

    private Map<String, BlobStoreContext<?, ?>> contexts;
    private final BlobStoreContextToContainerResult blobStoreContextToContainerResult;

    @Resource
    protected Logger logger = Logger.NULL;

    @Inject
    public GetAllContainersController(Map<String, BlobStoreContext<?, ?>> contexts,
            BlobStoreContextToContainerResult blobStoreContextToContainerResult) {
        this.contexts = contexts;
        this.blobStoreContextToContainerResult = blobStoreContextToContainerResult;
    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try {
            addMyContainersToRequest(request);
            RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/WEB-INF/jsp/containers.jsp");
            dispatcher.forward(request, response);
        } catch (Exception e) {
            logger.error(e, "Error listing containers");
            throw new ServletException(e);
        }
    }

    private void addMyContainersToRequest(HttpServletRequest request)
            throws InterruptedException, ExecutionException, TimeoutException {
        request.setAttribute("containers",
                Sets.newTreeSet(Iterables.transform(contexts.keySet(), blobStoreContextToContainerResult)));
    }
}