org.magnum.dataup.SimpleVideoSvcController.java Source code

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Here is the source code for org.magnum.dataup.SimpleVideoSvcController.java

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/*
 * 
 * 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.magnum.dataup;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.concurrent.atomic.AtomicLong;

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

import org.magnum.dataup.model.Video;
import org.magnum.dataup.model.VideoStatus;
import org.magnum.dataup.model.VideoStatus.VideoState;
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.RequestParam;
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;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver;

import retrofit.RetrofitError;
import retrofit.client.Response;
import retrofit.http.Multipart;
import retrofit.http.Part;
import retrofit.http.Path;
import retrofit.http.Streaming;
import retrofit.mime.TypedFile;

@Controller
public class SimpleVideoSvcController {

    // generate a global unique Id
    private static final AtomicLong currentId = new AtomicLong(0L);
    private HashMap<Long, Video> videos = new HashMap<Long, Video>();

    public Video save(Video entity) {
        checkAndSetId(entity);
        videos.put(entity.getId(), entity);
        return entity;
    }

    private void checkAndSetId(Video entity) {
        if (entity.getId() == 0) {
            entity.setId(currentId.incrementAndGet());
        }
    }

    @RequestMapping(value = "/video", method = RequestMethod.POST)
    public @ResponseBody Video addVideo(@RequestBody Video v) {
        //generate an Id and an URL
        save(v);
        v.setDataUrl(getDataUrl(v.getId()));
        return v;
    }

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

    private static VideoFileManager videoFileManager;

    @RequestMapping(value = "/video/{id}/data", method = RequestMethod.POST)
    public @ResponseBody VideoStatus setVideoData(@PathVariable("id") long id,
            @RequestParam("data") MultipartFile videoData, HttpServletResponse response) throws IOException {
        VideoStatus status = new VideoStatus(VideoState.READY);
        //don't have the video: return 404 - the client should receive a 404 error and throw an exception
        if (!videos.containsKey(id)) {
            //   response.setStatus(HttpServletResponse.SC_NOT_FOUND);
            response.sendError(HttpServletResponse.SC_NOT_FOUND);
            return status; // if the id is invalid, the status won't be checked by the client
        }

        videoFileManager = (null == videoFileManager) ? VideoFileManager.get() : videoFileManager;
        videoFileManager.saveVideoData(videos.get(id), videoData.getInputStream());
        //succesful: status.state == VideoState.READY            
        return status;
    }

    @RequestMapping(value = "/video/{id}/data", method = RequestMethod.GET)
    HttpServletResponse getData(@PathVariable(value = "id") long id, HttpServletResponse response)
            throws IOException {
        //don't have the data: response.state == 404 
        videoFileManager = (null == videoFileManager) ? VideoFileManager.get() : videoFileManager;
        if (!videos.containsKey(id) || !videoFileManager.hasVideoData(videos.get(id))) {
            response.sendError(404);
            return response;
        }

        //successful: response.state == 200
        videoFileManager.copyVideoData(videos.get(id), response.getOutputStream());
        response.setStatus(200);
        return response;
    }

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

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

}