org.jclouds.demo.tweetstore.controller.AddTweetsController.java Source code

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Here is the source code for org.jclouds.demo.tweetstore.controller.AddTweetsController.java

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/**
 *
 * Copyright (C) 2010 Cloud Conscious, LLC. <info@cloudconscious.com>
 *
 * ====================================================================
 * Licensed 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.demo.tweetstore.controller;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.Set;
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.demo.tweetstore.domain.StoredTweetStatus;
import org.jclouds.demo.tweetstore.functions.ServiceToStoredTweetStatuses;
import org.jclouds.logging.Logger;

import com.google.appengine.repackaged.com.google.common.collect.Lists;
import com.google.common.base.Function;
import com.google.common.collect.Iterables;

/**
 * Shows an example of how to use @{link BlobStoreContext} injected with Guice.
 * 
 * @author Adrian Cole
 */
@Singleton
public class AddTweetsController extends HttpServlet implements Function<Set<String>, List<StoredTweetStatus>> {

    /** The serialVersionUID */
    private static final long serialVersionUID = 3888348023150822683L;
    private final Map<String, BlobStoreContext> contexts;
    private final ServiceToStoredTweetStatuses blobStoreContextToContainerResult;

    @Resource
    protected Logger logger = Logger.NULL;

    @Inject
    public AddTweetsController(Map<String, BlobStoreContext> contexts,
            ServiceToStoredTweetStatuses blobStoreContextToContainerResult) {
        this.contexts = contexts;
        this.blobStoreContextToContainerResult = blobStoreContextToContainerResult;
    }

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

    void addMyTweetsToRequest(HttpServletRequest request)
            throws InterruptedException, ExecutionException, TimeoutException {
        request.setAttribute("tweets", apply(contexts.keySet()));
    }

    public List<StoredTweetStatus> apply(Set<String> in) {
        List<StoredTweetStatus> statuses = Lists.newArrayList();
        for (Iterable<StoredTweetStatus> list : Iterables.transform(in, blobStoreContextToContainerResult)) {
            Iterables.addAll(statuses, list);
        }
        return statuses;
    }
}