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/* * Copyright 2010 Facebook, Inc.//from w ww. j av a 2s . c o m * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.facebook.android; import java.io.FileNotFoundException; import java.io.IOException; import java.net.MalformedURLException; import android.content.Context; import android.os.Bundle; /** * A sample implementation of asynchronous API requests. This class provides * the ability to execute API methods and have the call return immediately, * without blocking the calling thread. This is necessary when accessing the * API in the UI thread, for instance. The request response is returned to * the caller via a callback interface, which the developer must implement. * * This sample implementation simply spawns a new thread for each request, * and makes the API call immediately. This may work in many applications, * but more sophisticated users may re-implement this behavior using a thread * pool, a network thread, a request queue, or other mechanism. Advanced * functionality could be built, such as rate-limiting of requests, as per * a specific application's needs. * * @see RequestListener * The callback interface. * * @author Jim Brusstar (jimbru@fb.com), * Yariv Sadan (yariv@fb.com), * Luke Shepard (lshepard@fb.com) */ public class AsyncFacebookRunner { Facebook fb; public AsyncFacebookRunner(Facebook fb) { this.fb = fb; } /** * Invalidate the current user session by removing the access token in * memory, clearing the browser cookies, and calling auth.expireSession * through the API. The application will be notified when logout is * complete via the callback interface. * * Note that this method is asynchronous and the callback will be invoked * in a background thread; operations that affect the UI will need to be * posted to the UI thread or an appropriate handler. * * @param context * The Android context in which the logout should be called: it * should be the same context in which the login occurred in * order to clear any stored cookies * @param listener * Callback interface to notify the application when the request * has completed. * @param state * An arbitrary object used to identify the request when it * returns to the callback. This has no effect on the request * itself. */ public void logout(final Context context, final RequestListener listener, final Object state) { new Thread() { @Override public void run() { try { String response = fb.logout(context); if (response.length() == 0 || response.equals("false")){ listener.onFacebookError(new FacebookError( "auth.expireSession failed"), state); return; } listener.onComplete(response, state); } catch (FileNotFoundException e) { listener.onFileNotFoundException(e, state); } catch (MalformedURLException e) { listener.onMalformedURLException(e, state); } catch (IOException e) { listener.onIOException(e, state); } } }.start(); } public void logout(final Context context, final RequestListener listener) { logout(context, listener, /* state */ null); } /** * Make a request to Facebook's old (pre-graph) API with the given * parameters. One of the parameter keys must be "method" and its value * should be a valid REST server API method. * * See http://developers.facebook.com/docs/reference/rest/ * * Note that this method is asynchronous and the callback will be invoked * in a background thread; operations that affect the UI will need to be * posted to the UI thread or an appropriate handler. * * Example: * <code> * Bundle parameters = new Bundle(); * parameters.putString("method", "auth.expireSession", new Listener()); * String response = request(parameters); * </code> * * @param parameters * Key-value pairs of parameters to the request. Refer to the * documentation: one of the parameters must be "method". * @param listener * Callback interface to notify the application when the request * has completed. * @param state * An arbitrary object used to identify the request when it * returns to the callback. This has no effect on the request * itself. */ public void request(Bundle parameters, RequestListener listener, final Object state) { request(null, parameters, "GET", listener, state); } public void request(Bundle parameters, RequestListener listener) { request(null, parameters, "GET", listener, /* state */ null); } /** * Make a request to the Facebook Graph API without any parameters. * * See http://developers.facebook.com/docs/api * * Note that this method is asynchronous and the callback will be invoked * in a background thread; operations that affect the UI will need to be * posted to the UI thread or an appropriate handler. * * @param graphPath * Path to resource in the Facebook graph, e.g., to fetch data * about the currently logged authenticated user, provide "me", * which will fetch http://graph.facebook.com/me * @param listener * Callback interface to notify the application when the request * has completed. * @param state * An arbitrary object used to identify the request when it * returns to the callback. This has no effect on the request * itself. */ public void request(String graphPath, RequestListener listener, final Object state) { request(graphPath, new Bundle(), "GET", listener, state); } public void request(String graphPath, RequestListener listener) { request(graphPath, new Bundle(), "GET", listener, /* state */ null); } /** * Make a request to the Facebook Graph API with the given string parameters * using an HTTP GET (default method). * * See http://developers.facebook.com/docs/api * * Note that this method is asynchronous and the callback will be invoked * in a background thread; operations that affect the UI will need to be * posted to the UI thread or an appropriate handler. * * @param graphPath * Path to resource in the Facebook graph, e.g., to fetch data * about the currently logged authenticated user, provide "me", * which will fetch http://graph.facebook.com/me * @param parameters * key-value string parameters, e.g. the path "search" with * parameters "q" : "facebook" would produce a query for the * following graph resource: * https://graph.facebook.com/search?q=facebook * @param listener * Callback interface to notify the application when the request * has completed. * @param state * An arbitrary object used to identify the request when it * returns to the callback. This has no effect on the request * itself. */ public void request(String graphPath, Bundle parameters, RequestListener listener, final Object state) { request(graphPath, parameters, "GET", listener, state); } public void request(String graphPath, Bundle parameters, RequestListener listener) { request(graphPath, parameters, "GET", listener, /* state */ null); } /** * Make a request to the Facebook Graph API with the given HTTP method and * string parameters. Note that binary data parameters (e.g. pictures) are * not yet supported by this helper function. * * See http://developers.facebook.com/docs/api * * Note that this method is asynchronous and the callback will be invoked * in a background thread; operations that affect the UI will need to be * posted to the UI thread or an appropriate handler. * * @param graphPath * Path to resource in the Facebook graph, e.g., to fetch data * about the currently logged authenticated user, provide "me", * which will fetch http://graph.facebook.com/me * @param parameters * key-value string parameters, e.g. the path "search" with * parameters {"q" : "facebook"} would produce a query for the * following graph resource: * https://graph.facebook.com/search?q=facebook * @param httpMethod * http verb, e.g. "POST", "DELETE" * @param listener * Callback interface to notify the application when the request * has completed. * @param state * An arbitrary object used to identify the request when it * returns to the callback. This has no effect on the request * itself. */ public void request(final String graphPath, final Bundle parameters, final String httpMethod, final RequestListener listener, final Object state) { new Thread() { @Override public void run() { try { String resp = fb.request(graphPath, parameters, httpMethod); listener.onComplete(resp, state); } catch (FileNotFoundException e) { listener.onFileNotFoundException(e, state); } catch (MalformedURLException e) { listener.onMalformedURLException(e, state); } catch (IOException e) { listener.onIOException(e, state); } } }.start(); } /** * Callback interface for API requests. * * Each method includes a 'state' parameter that identifies the calling * request. It will be set to the value passed when originally calling the * request method, or null if none was passed. */ public static interface RequestListener { /** * Called when a request completes with the given response. * * Executed by a background thread: do not update the UI in this method. */ public void onComplete(String response, Object state); /** * Called when a request has a network or request error. * * Executed by a background thread: do not update the UI in this method. */ public void onIOException(IOException e, Object state); /** * Called when a request fails because the requested resource is * invalid or does not exist. * * Executed by a background thread: do not update the UI in this method. */ public void onFileNotFoundException(FileNotFoundException e, Object state); /** * Called if an invalid graph path is provided (which may result in a * malformed URL). * * Executed by a background thread: do not update the UI in this method. */ public void onMalformedURLException(MalformedURLException e, Object state); /** * Called when the server-side Facebook method fails. * * Executed by a background thread: do not update the UI in this method. */ public void onFacebookError(FacebookError e, Object state); } }