code.grnet.gr Git - pithos-web-client/blob - src/gr/grnet/pithos/web/client/rest/DeleteRequest.java

   1 /*
   2  * Copyright 2011-2012 GRNET S.A. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or
   5  * without modification, are permitted provided that the following
   6  * conditions are met:
   7  *
   8  *   1. Redistributions of source code must retain the above
   9  *      copyright notice, this list of conditions and the following
  10  *      disclaimer.
  11  *
  12  *   2. Redistributions in binary form must reproduce the above
  13  *      copyright notice, this list of conditions and the following
  14  *      disclaimer in the documentation and/or other materials
  15  *      provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
  18  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  20  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
  21  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  22  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  23  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  24  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  25  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  27  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28  * POSSIBILITY OF SUCH DAMAGE.
  29  *
  30  * The views and conclusions contained in the software and
  31  * documentation are those of the authors and should not be
  32  * interpreted as representing official policies, either expressed
  33  * or implied, of GRNET S.A.
  34  */
  35
  36 package gr.grnet.pithos.web.client.rest;
  37
  38 import gr.grnet.pithos.web.client.Resource;
  39
  40 import java.util.HashMap;
  41 import java.util.Map;
  42
  43 import com.google.gwt.core.client.Scheduler;
  44 import com.google.gwt.core.client.Scheduler.ScheduledCommand;
  45 import com.google.gwt.http.client.Request;
  46 import com.google.gwt.http.client.RequestBuilder;
  47 import com.google.gwt.http.client.RequestException;
  48 import com.google.gwt.http.client.Response;
  49
  50 /**
  51  * Created by IntelliJ IDEA. User: chstath Date: 7/5/11 Time: 5:29 PM To change this template use File | Settings | File
  52  * Templates.
  53  */
  54 public abstract class DeleteRequest implements ScheduledCommand {
  55
  56         protected static final int MAX_RETRIES = 3;
  57
  58         protected int retries = 0;
  59
  60         private String api;
  61
  62     protected String owner;
  63
  64     private String path;
  65
  66     private Map<String, String> headers = new HashMap<String, String>();
  67
  68     public abstract void onSuccess(Resource result);
  69
  70     public abstract void onError(Throwable t);
  71
  72     public DeleteRequest(String api, String owner, String path) {
  73         this.api = api;
  74         this.owner = owner;
  75         this.path = path;
  76     }
  77
  78     @Override
  79     public void execute() {
  80         System.out.println("DELETE " + api + owner + path);
  81         RequestBuilder builder = new RequestBuilder(RequestBuilder.DELETE, api + owner + path);
  82         for (String header : headers.keySet()) {
  83             builder.setHeader(header, headers.get(header));
  84         }
  85         try {
  86             builder.sendRequest("", new RestRequestCallback<Resource>(api + owner + path, Response.SC_NO_CONTENT) {
  87                 @Override
  88                 public void onSuccess(Resource object) {
  89                     DeleteRequest.this.onSuccess(object);
  90                 }
  91
  92                 @Override
  93                 public Resource deserialize(Response response) {
  94                     return Resource.createFromResponse(Resource.class, owner, response, null);
  95                 }
  96
  97                 @Override
  98                 public void onError(Request request, Throwable throwable) {
  99                         if (retries >= MAX_RETRIES)
 100                                 DeleteRequest.this.onError(throwable);
 101                         else
 102                                 Scheduler.get().scheduleDeferred(DeleteRequest.this);
 103                 }
 104
 105                                 @Override
 106                                 public void onUnauthorized(Response response) {
 107                         if (retries >= MAX_RETRIES)
 108                                 DeleteRequest.this.onUnauthorized(response);
 109                         else
 110                                 Scheduler.get().scheduleDeferred(DeleteRequest.this);
 111                                 }
 112             });
 113             retries++;
 114         }
 115         catch (RequestException e) {
 116         }
 117     }
 118
 119     protected abstract void onUnauthorized(Response response);
 120
 121         public void setHeader(String header, String value) {
 122         headers.put(header, value);
 123     }
 124 }