org.coursera.cmbrehm.kewlvideo.server.VideoController.java Source code

Introduction

Here is the source code for org.coursera.cmbrehm.kewlvideo.server.VideoController.java

Source

/*
 * 
 * Copyright 2014 Jules White
 *
 * 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.coursera.cmbrehm.kewlvideo.server;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicLong;

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

import org.coursera.cmbrehm.kewlvideo.server.model.Video;
import org.coursera.cmbrehm.kewlvideo.server.model.VideoStatus;
import org.coursera.cmbrehm.kewlvideo.server.model.VideoStatus.VideoState;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.multipart.MultipartFile;

@Controller
public class VideoController {

    /**
     * You will need to create one or more Spring controllers to fulfill the
     * requirements of the assignment. If you use this file, please rename it
     * to something other than "AnEmptyController"
     * 
     * 
        ________  ________  ________  ________          ___       ___  ___  ________  ___  __       
       |\   ____\|\   __  \|\   __  \|\   ___ \        |\  \     |\  \|\  \|\   ____\|\  \|\  \     
       \ \  \___|\ \  \|\  \ \  \|\  \ \  \_|\ \       \ \  \    \ \  \\\  \ \  \___|\ \  \/  /|_   
        \ \  \  __\ \  \\\  \ \  \\\  \ \  \ \\ \       \ \  \    \ \  \\\  \ \  \    \ \   ___  \  
    \ \  \|\  \ \  \\\  \ \  \\\  \ \  \_\\ \       \ \  \____\ \  \\\  \ \  \____\ \  \\ \  \ 
     \ \_______\ \_______\ \_______\ \_______\       \ \_______\ \_______\ \_______\ \__\\ \__\
      \|_______|\|_______|\|_______|\|_______|        \|_______|\|_______|\|_______|\|__| \|__|
                                                                                                                                                                                                                                                                        
     * 
     */

    private AtomicLong idGenerator;
    private HashMap<Long, Video> videoList;

    public VideoController() {
        idGenerator = new AtomicLong(1l);
        videoList = new HashMap<Long, Video>();
    }

    @RequestMapping(value = "/video", method = RequestMethod.GET)
    public @ResponseBody Collection<Video> getVideos() {
        return videoList.values();
    }

    @RequestMapping(value = "/video", method = RequestMethod.POST)
    public @ResponseBody Video saveVideo(@RequestBody Video videoIn) {
        long id = idGenerator.incrementAndGet();
        videoIn.setId(id);
        videoIn.setDataUrl(getDataUrl(id));
        videoList.put(id, videoIn);
        return videoIn;
    }

    @RequestMapping(value = "/video/{id}/data", method = RequestMethod.GET)
    public void retrieveVideoData(@PathVariable("id") long id, HttpServletResponse response) {
        try {
            VideoFileManager vfmgr = VideoFileManager.get();
            Video video = videoList.get(id);
            if (video != null && vfmgr.hasVideoData(video)) {
                OutputStream outStream = response.getOutputStream();
                response.setContentType(video.getContentType());
                vfmgr.copyVideoData(video, outStream);
            } else {
                response.setStatus(HttpStatus.NOT_FOUND.value());
            }
        } catch (IOException iox) {
            try {
                response.sendError(HttpStatus.INTERNAL_SERVER_ERROR.value(), iox.getMessage());
            } catch (Throwable t) {
            }
        }

    }

    @RequestMapping(value = "/video/{id}/data", method = RequestMethod.POST)
    public ResponseEntity<VideoStatus> saveVideoData(@PathVariable("id") long id,
            @RequestPart("data") MultipartFile videoData) {
        ResponseEntity<VideoStatus> response;
        try {
            InputStream videoDataStream = videoData.getInputStream();
            VideoFileManager vfmgr = VideoFileManager.get();
            Video video = videoList.get(id);
            if (video != null) {
                vfmgr.saveVideoData(video, videoDataStream);
                response = new ResponseEntity<VideoStatus>(new VideoStatus(VideoState.READY), HttpStatus.ACCEPTED);
            } else {
                response = new ResponseEntity<VideoStatus>(HttpStatus.NOT_FOUND);
            }
        } catch (IOException iox) {
            response = new ResponseEntity<VideoStatus>(HttpStatus.INTERNAL_SERVER_ERROR);
        }
        return response;
    }

    private String getDataUrl(long videoId) {
        String url = getUrlBaseForLocalServer() + "/video/" + videoId + "/data";
        return url;
    }

    private String getUrlBaseForLocalServer() {
        HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes())
                .getRequest();
        String base = "http://" + request.getServerName()
                + ((request.getServerPort() != 80) ? ":" + request.getServerPort() : "");
        return base;
    }

}