root / web_client / src / gr / grnet / pithos / web / client / rest / GetRequest.java @ b2fc16aa
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1 | 9e8e14e4 | Christos Stathis | /*
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2 | 58777026 | Christos Stathis | * Copyright 2011 GRNET S.A. All rights reserved.
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3 | 58777026 | Christos Stathis | *
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4 | 58777026 | Christos Stathis | * Redistribution and use in source and binary forms, with or
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5 | 58777026 | Christos Stathis | * without modification, are permitted provided that the following
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6 | 58777026 | Christos Stathis | * conditions are met:
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7 | 58777026 | Christos Stathis | *
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8 | 58777026 | Christos Stathis | * 1. Redistributions of source code must retain the above
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9 | 58777026 | Christos Stathis | * copyright notice, this list of conditions and the following
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10 | 58777026 | Christos Stathis | * disclaimer.
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11 | 58777026 | Christos Stathis | *
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12 | 58777026 | Christos Stathis | * 2. Redistributions in binary form must reproduce the above
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13 | 58777026 | Christos Stathis | * copyright notice, this list of conditions and the following
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14 | 58777026 | Christos Stathis | * disclaimer in the documentation and/or other materials
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15 | 58777026 | Christos Stathis | * provided with the distribution.
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16 | 58777026 | Christos Stathis | *
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17 | 58777026 | Christos Stathis | * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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18 | 58777026 | Christos Stathis | * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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19 | 58777026 | Christos Stathis | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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20 | 58777026 | Christos Stathis | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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21 | 58777026 | Christos Stathis | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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22 | 58777026 | Christos Stathis | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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23 | 58777026 | Christos Stathis | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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24 | 58777026 | Christos Stathis | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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25 | 58777026 | Christos Stathis | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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26 | 58777026 | Christos Stathis | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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27 | 58777026 | Christos Stathis | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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28 | 58777026 | Christos Stathis | * POSSIBILITY OF SUCH DAMAGE.
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29 | 58777026 | Christos Stathis | *
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30 | 58777026 | Christos Stathis | * The views and conclusions contained in the software and
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31 | 58777026 | Christos Stathis | * documentation are those of the authors and should not be
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32 | 58777026 | Christos Stathis | * interpreted as representing official policies, either expressed
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33 | 58777026 | Christos Stathis | * or implied, of GRNET S.A.
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34 | 9e8e14e4 | Christos Stathis | */
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35 | 9e8e14e4 | Christos Stathis | |
36 | 9e8e14e4 | Christos Stathis | package gr.grnet.pithos.web.client.rest; |
37 | 9e8e14e4 | Christos Stathis | |
38 | 9e8e14e4 | Christos Stathis | import com.google.gwt.core.client.GWT; |
39 | 9e8e14e4 | Christos Stathis | import com.google.gwt.core.client.Scheduler.ScheduledCommand; |
40 | 9e8e14e4 | Christos Stathis | import com.google.gwt.http.client.Request; |
41 | 9e8e14e4 | Christos Stathis | import com.google.gwt.http.client.RequestBuilder; |
42 | 9e8e14e4 | Christos Stathis | import com.google.gwt.http.client.RequestException; |
43 | 9e8e14e4 | Christos Stathis | import com.google.gwt.http.client.Response; |
44 | 9e8e14e4 | Christos Stathis | import gr.grnet.pithos.web.client.foldertree.Resource; |
45 | 9e8e14e4 | Christos Stathis | import java.util.HashMap; |
46 | 9e8e14e4 | Christos Stathis | import java.util.Map; |
47 | 9e8e14e4 | Christos Stathis | |
48 | 9e8e14e4 | Christos Stathis | public abstract class GetRequest<T extends Resource> implements ScheduledCommand { |
49 | 9e8e14e4 | Christos Stathis | |
50 | 9e8e14e4 | Christos Stathis | private Class<T> aClass; |
51 | 9e8e14e4 | Christos Stathis | |
52 | 9e8e14e4 | Christos Stathis | private String path; |
53 | 9e8e14e4 | Christos Stathis | |
54 | 9e8e14e4 | Christos Stathis | private int okCode; |
55 | 9e8e14e4 | Christos Stathis | |
56 | 9e8e14e4 | Christos Stathis | private String username; |
57 | 9e8e14e4 | Christos Stathis | |
58 | 9e8e14e4 | Christos Stathis | private T cached;
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59 | 9e8e14e4 | Christos Stathis | |
60 | 5cd18037 | Christos Stathis | private T result;
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61 | 5cd18037 | Christos Stathis | |
62 | 9e8e14e4 | Christos Stathis | private Map<String, String> headers = new HashMap<String, String>(); |
63 | 9e8e14e4 | Christos Stathis | |
64 | 9e8e14e4 | Christos Stathis | public abstract void onSuccess(T result); |
65 | 9e8e14e4 | Christos Stathis | |
66 | 9e8e14e4 | Christos Stathis | public abstract void onError(Throwable t); |
67 | 9e8e14e4 | Christos Stathis | |
68 | 5cd18037 | Christos Stathis | public GetRequest(Class<T> aClass, String path, int okCode, T result) { |
69 | 9e8e14e4 | Christos Stathis | this.aClass = aClass;
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70 | 9e8e14e4 | Christos Stathis | this.path = path;
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71 | 9e8e14e4 | Christos Stathis | this.okCode = okCode;
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72 | 5cd18037 | Christos Stathis | this.result = result;
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73 | 9e8e14e4 | Christos Stathis | } |
74 | 9e8e14e4 | Christos Stathis | |
75 | 9e8e14e4 | Christos Stathis | public GetRequest(Class<T> aClass, String path) { |
76 | 5cd18037 | Christos Stathis | this(aClass, path, -1, null); |
77 | 5cd18037 | Christos Stathis | } |
78 | 5cd18037 | Christos Stathis | |
79 | 5cd18037 | Christos Stathis | public GetRequest(Class<T> aClass, String path, T result) { |
80 | 5cd18037 | Christos Stathis | this(aClass, path, -1, result); |
81 | 9e8e14e4 | Christos Stathis | } |
82 | 9e8e14e4 | Christos Stathis | |
83 | 9e8e14e4 | Christos Stathis | @Override
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84 | 9e8e14e4 | Christos Stathis | public void execute() { |
85 | 9e8e14e4 | Christos Stathis | RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, path);
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86 | b2fc16aa | Christos Stathis | for (String header : headers.keySet()) { |
87 | b2fc16aa | Christos Stathis | builder.setHeader("If-Modified-Since", "0"); |
88 | 9e8e14e4 | Christos Stathis | builder.setHeader(header, headers.get(header)); |
89 | b2fc16aa | Christos Stathis | } |
90 | 9e8e14e4 | Christos Stathis | try {
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91 | 9e8e14e4 | Christos Stathis | builder.sendRequest("", new RestRequestCallback<T>(path, okCode) { |
92 | 9e8e14e4 | Christos Stathis | @Override
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93 | 9e8e14e4 | Christos Stathis | public void onSuccess(T object) { |
94 | 9e8e14e4 | Christos Stathis | GetRequest.this.onSuccess(object); |
95 | 9e8e14e4 | Christos Stathis | } |
96 | 9e8e14e4 | Christos Stathis | |
97 | 9e8e14e4 | Christos Stathis | @Override
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98 | 9e8e14e4 | Christos Stathis | public T deserialize(Response response) {
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99 | 5cd18037 | Christos Stathis | return Resource.createFromResponse(aClass, response, result);
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100 | 9e8e14e4 | Christos Stathis | } |
101 | 9e8e14e4 | Christos Stathis | |
102 | 9e8e14e4 | Christos Stathis | @Override
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103 | 9e8e14e4 | Christos Stathis | public void onError(Request request, Throwable throwable) { |
104 | 9e8e14e4 | Christos Stathis | if (throwable instanceof RestException) { |
105 | 9e8e14e4 | Christos Stathis | if (((RestException) throwable).getHttpStatusCode() == 304 && cached != null){ |
106 | 1ac430a1 | Christos Stathis | GWT.log("Using cache: " + cached.toString(), null); |
107 | 9e8e14e4 | Christos Stathis | onSuccess(cached); |
108 | 9e8e14e4 | Christos Stathis | return;
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109 | 9e8e14e4 | Christos Stathis | } |
110 | 9e8e14e4 | Christos Stathis | } |
111 | 9e8e14e4 | Christos Stathis | GetRequest.this.onError(throwable); |
112 | 9e8e14e4 | Christos Stathis | } |
113 | 9e8e14e4 | Christos Stathis | }); |
114 | 9e8e14e4 | Christos Stathis | } |
115 | 9e8e14e4 | Christos Stathis | catch (RequestException e) {
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116 | 9e8e14e4 | Christos Stathis | } |
117 | 9e8e14e4 | Christos Stathis | } |
118 | 9e8e14e4 | Christos Stathis | |
119 | 9e8e14e4 | Christos Stathis | public void setHeader(String header, String value) { |
120 | 9e8e14e4 | Christos Stathis | headers.put(header, value); |
121 | 9e8e14e4 | Christos Stathis | } |
122 | 9e8e14e4 | Christos Stathis | } |