Synnefo » Pithos Web Client

/*

 * Copyright 2011-2013 GRNET S.A. All rights reserved.

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 * Redistribution and use in source and binary forms, with or

 * without modification, are permitted provided that the following

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 *

 *   1. Redistributions of source code must retain the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer.

 *

 *   2. Redistributions in binary form must reproduce the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer in the documentation and/or other materials

 *      provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

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 * or implied, of GRNET S.A.

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package gr.grnet.pithos.web.client.rest;

import gr.grnet.pithos.web.client.Resource;

import java.util.HashMap;

import java.util.Map;

import com.google.gwt.core.client.Scheduler;

import com.google.gwt.core.client.Scheduler.ScheduledCommand;

import com.google.gwt.http.client.Request;

import com.google.gwt.http.client.RequestBuilder;

import com.google.gwt.http.client.RequestException;

import com.google.gwt.http.client.Response;

/**

 * Created by IntelliJ IDEA. User: chstath Date: 7/5/11 Time: 5:29 PM To change this template use File | Settings | File

 * Templates.

 */

public abstract class DeleteRequest implements ScheduledCommand {

        protected static final int MAX_RETRIES = 3; 

        protected int retries = 0; 

        private String api;

    protected String owner;

    private String path;

    private Map<String, String> headers = new HashMap<String, String>();

    public abstract void onSuccess(Resource result);

    public abstract void onError(Throwable t);

    public DeleteRequest(String api, String owner, String path) {

        this.api = api;

        this.owner = owner;

        this.path = path;

    }

    @Override

    public void execute() {

        RequestBuilder builder = new RequestBuilder(RequestBuilder.DELETE, api + owner + path);

        for (String header : headers.keySet()) {

            builder.setHeader(header, headers.get(header));

        }

        try {

            builder.sendRequest("", new RestRequestCallback<Resource>(api + owner + path, Response.SC_NO_CONTENT) {

                @Override

                public void onSuccess(Resource object) {

                    DeleteRequest.this.onSuccess(object);

                }

                @Override

                public Resource deserialize(Response response) {

                    return Resource.createFromResponse(Resource.class, owner, response, null);

                }

                @Override

                public void onError(Request request, Throwable throwable) {

                        if (retries >= MAX_RETRIES)

                                DeleteRequest.this.onError(throwable);

                        else

                                Scheduler.get().scheduleDeferred(DeleteRequest.this);

                }

                                @Override

                                public void onUnauthorized(Response response) {

                        if (retries >= MAX_RETRIES)

                                DeleteRequest.this.onUnauthorized(response);

                        else

                                Scheduler.get().scheduleDeferred(DeleteRequest.this);

                                }

            });

            retries++;

        }

        catch (RequestException e) {

        }

    }

    protected abstract void onUnauthorized(Response response);

        public void setHeader(String header, String value) {

        headers.put(header, value);

    }

}