2 * Copyright 2011-2012 GRNET S.A. All rights reserved.
4 * Redistribution and use in source and binary forms, with or
5 * without modification, are permitted provided that the following
8 * 1. Redistributions of source code must retain the above
9 * copyright notice, this list of conditions and the following
12 * 2. Redistributions in binary form must reproduce the above
13 * copyright notice, this list of conditions and the following
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17 * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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33 * or implied, of GRNET S.A.
36 package gr.grnet.pithos.web.client.rest;
38 import gr.grnet.pithos.web.client.Resource;
40 import java.util.HashMap;
43 import com.google.gwt.core.client.GWT;
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;
50 public abstract class HeadRequest<T extends Resource> implements ScheduledCommand {
52 protected static final int MAX_RETRIES = 3;
54 protected int retries = 0;
56 protected Class<T> aClass;
60 protected String owner;
70 private Map<String, String> headers = new HashMap<String, String>();
72 public abstract void onSuccess(T _result);
74 public abstract void onError(Throwable t);
76 public HeadRequest(Class<T> aClass, String api, String owner, String path, int okCode, T result) {
85 public HeadRequest(Class<T> aClass, String api, String owner, String path) {
86 this(aClass, api, owner, path, Response.SC_NO_CONTENT, null);
89 public HeadRequest(Class<T> aClass, String api, String owner, String path, T result) {
90 this(aClass, api, owner, path, Response.SC_NO_CONTENT, result);
94 public void execute() {
95 if (path.contains("?"))
96 path += "&t=" + System.currentTimeMillis();
98 path += "?t=" + System.currentTimeMillis();
99 System.out.println("HEAD " + api + owner + path);
100 RequestBuilder builder = new RequestBuilder(RequestBuilder.HEAD, api + owner + path);
101 for (String header : headers.keySet()) {
102 builder.setHeader(header, headers.get(header));
105 builder.sendRequest("", new RestRequestCallback<T>(api + owner + path, okCode) {
107 public void onSuccess(T object) {
108 HeadRequest.this.onSuccess(object);
112 public T deserialize(Response response) {
113 return Resource.createFromResponse(aClass, owner, response, result);
117 public void onError(Request request, Throwable throwable) {
118 if (throwable instanceof RestException) {
119 if (((RestException) throwable).getHttpStatusCode() == 304 && cached != null){
120 GWT.log("Using cache: " + cached.toString(), null);
125 HeadRequest.this.onError(throwable);
129 public void onUnauthorized(Response response) {
130 HeadRequest.this.onUnauthorized(response);
135 catch (RequestException e) {
139 protected abstract void onUnauthorized(Response response);
141 public void setHeader(String header, String value) {
142 headers.put(header, value);