root / src / gr / grnet / pithos / web / client / rest / HeadRequest.java @ 45c76262
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/*
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* Copyright 2011-2013 GRNET S.A. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* 1. Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* The views and conclusions contained in the software and
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* documentation are those of the authors and should not be
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* interpreted as representing official policies, either expressed
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* or implied, of GRNET S.A.
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*/
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package gr.grnet.pithos.web.client.rest; |
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import gr.grnet.pithos.web.client.Const; |
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import gr.grnet.pithos.web.client.Helpers; |
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import gr.grnet.pithos.web.client.Pithos; |
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import gr.grnet.pithos.web.client.Resource; |
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import java.util.HashMap; |
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import java.util.Map; |
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import com.google.gwt.core.client.GWT; |
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import com.google.gwt.core.client.Scheduler.ScheduledCommand; |
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import com.google.gwt.http.client.Request; |
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import com.google.gwt.http.client.RequestBuilder; |
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import com.google.gwt.http.client.RequestException; |
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import com.google.gwt.http.client.Response; |
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public abstract class HeadRequest<T extends Resource> implements ScheduledCommand { |
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protected static final int MAX_RETRIES = 3; |
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protected int retries = 0; |
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protected Class<T> aClass; |
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private String api; |
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protected String owner; |
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private String path; |
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private int okCode; |
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protected T cached;
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protected T result;
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private Map<String, String> headers = new HashMap<String, String>(); |
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public abstract void onSuccess(T _result); |
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public abstract void onError(Throwable t); |
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public HeadRequest(Class<T> aClass, String api, String owner, String path, int okCode, T result) { |
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this.aClass = aClass;
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this.api = api;
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this.owner = owner;
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this.path = path;
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this.okCode = okCode;
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this.result = result;
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} |
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public HeadRequest(Class<T> aClass, String api, String owner, String path) { |
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this(aClass, api, owner, path, Response.SC_NO_CONTENT, null); |
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} |
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public HeadRequest(Class<T> aClass, String api, String owner, String path, T result) { |
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this(aClass, api, owner, path, Response.SC_NO_CONTENT, result);
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} |
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@Override
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public void execute() { |
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if (path.contains(Const.QUESTION_MARK)) {
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path += "&t=" + System.currentTimeMillis(); |
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} |
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else {
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path += "?t=" + System.currentTimeMillis(); |
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} |
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Pithos.LOG("HEAD ", api + owner + path);
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RequestBuilder builder = new RequestBuilder(RequestBuilder.HEAD, api + owner + path);
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Helpers.setHeaders(builder, headers); |
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try {
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builder.sendRequest("", new RestRequestCallback<T>(api + owner + path, okCode) { |
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@Override
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public void onSuccess(T object) { |
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HeadRequest.this.onSuccess(object); |
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} |
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@Override
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public T deserialize(Response response) {
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return Resource.createFromResponse(aClass, owner, response, result);
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} |
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@Override
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public void onError(Request request, Throwable throwable) { |
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if (throwable instanceof RestException) { |
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if (((RestException) throwable).getHttpStatusCode() == 304 && cached != null){ |
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GWT.log("Using cache: " + cached.toString(), null); |
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onSuccess(cached); |
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return;
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} |
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} |
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HeadRequest.this.onError(throwable); |
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} |
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@Override
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public void onUnauthorized(Response response) { |
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HeadRequest.this.onUnauthorized(response); |
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} |
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}); |
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retries++; |
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} |
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catch (RequestException e) {
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Pithos.LOG(e); |
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} |
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} |
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protected abstract void onUnauthorized(Response response); |
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public void setHeader(String header, String value) { |
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headers.put(header, value); |
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} |
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} |