Java tutorial
/* * Copyright (C) 2010 The Android Open Source Project * * 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.york.cs.swe.SyncAdapter; import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.util.Calendar; import java.util.Date; import java.util.Observable; import org.apache.http.HttpStatus; import org.apache.http.client.HttpResponseException; import android.accounts.Account; import android.accounts.AccountManager; import android.accounts.AuthenticatorException; import android.accounts.OperationCanceledException; import android.content.AbstractThreadedSyncAdapter; import android.content.ContentProviderClient; import android.content.ContentResolver; import android.content.Context; import android.content.SyncResult; import android.os.Bundle; import android.os.Handler; import android.os.Looper; import android.util.Log; import com.couchbase.lite.Database; import com.couchbase.lite.replicator.Replication; import com.york.cs.swe.todolite.Application; import com.york.cs.swe.authentication.AccountGeneral; /** * * /** Define a sync adapter for the app. * * This class is instantiated in {@link SyncService}, which also binds * SyncAdapter to the system. SyncAdapter should only be initialized in * SyncService, never anywhere else. * * <p> * The system calls onPerformSync() via an RPC call through the IBinder object * supplied by SyncService. * * @author sebas * */ public class SyncAdapterCB extends AbstractThreadedSyncAdapter { private static final String TAG = "SyncAdapterCB"; private final AccountManager mAccountManager; private OnSyncProgressChangeObservable onSyncProgressChangeObservable; private OnSyncUnauthorizedObservable onSyncUnauthorizedObservable; // Global variables // Define a variable to contain a content resolver instance ContentResolver mContentResolver; /** * Constructor. Obtains handle to content resolver for later use. */ public SyncAdapterCB(Context context, boolean autoInitialize) { super(context, autoInitialize); mAccountManager = AccountManager.get(context); mContentResolver = context.getContentResolver(); } public SyncAdapterCB(Context context, boolean autoInitialize, boolean allowParallelSyncs) { super(context, autoInitialize, allowParallelSyncs); mAccountManager = AccountManager.get(context); mContentResolver = context.getContentResolver(); } /** * Called by the Android system in response to a request to run the sync * adapter. The work required to read data from the network, parse it, and * store it done here. Extending AbstractThreadedSyncAdapter ensures that * all methods within SyncAdapter run on a background thread. For this * reason, blocking I/O and other long-running tasks can be run * <em>in situ</em>, and you don't have to set up a separate thread for * them. . * * <p> * This is where we actually perform any work required to perform a sync. * {@link AbstractThreadedSyncAdapter} guarantees that this will be called * on a non-UI thread, so it is safe to peform blocking I/O here. * * <p> * The syncResult argument allows you to pass information back to the method * that triggered the sync. */ @Override public void onPerformSync(Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult syncResult) { Log.d(TAG, "onPerformSync for account"); // Building a print of the extras we got StringBuilder sb = new StringBuilder(); if (extras != null) { for (String key : extras.keySet()) { sb.append(key + "[" + extras.get(key) + "] "); } } Log.d(TAG, "onPerformSync for account[" + account.name + "]. Extras: " + sb.toString()); try { // Get the auth token for the current account and // the userObjectId, needed for creating items on Parse.com account String authToken = mAccountManager.blockingGetAuthToken(account, AccountGeneral.AUTHTOKEN_TYPE_FULL_ACCESS, true); String userObjectId = mAccountManager.getUserData(account, AccountGeneral.USERDATA_USER_OBJ_ID); Log.d(TAG, "start sunc" + authToken + "-" + userObjectId); Application application = (Application) getContext(); Database database = application.getDatabase(); initObservable(); startSyncWithCustomCookie(database, authToken); } catch (OperationCanceledException e) { e.printStackTrace(); } catch (IOException e) { syncResult.stats.numIoExceptions++; e.printStackTrace(); } catch (AuthenticatorException e) { syncResult.stats.numAuthExceptions++; e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } } private void startSyncWithCustomCookie(Database database, String cookieVal) { String cookieName = "SyncGatewaySession"; boolean isSecure = false; boolean httpOnly = false; // expiration date - 1 day from now Calendar cal = Calendar.getInstance(); cal.setTime(new Date()); int numDaysToAdd = 1; cal.add(Calendar.DATE, numDaysToAdd); Date expirationDate = cal.getTime(); startReplicationSyncWithCustomCookie(database, cookieName, cookieVal, "/", expirationDate, isSecure, httpOnly); } public void startReplicationSyncWithCustomCookie(Database database, String name, String value, String path, Date expirationDate, boolean secure, boolean httpOnly) { Replication[] replications = createReplications(database); Replication pullRep = replications[0]; Replication pushRep = replications[1]; pullRep.setCookie(name, value, path, expirationDate, secure, httpOnly); pushRep.setCookie(name, value, path, expirationDate, secure, httpOnly); pullRep.start(); pushRep.start(); Log.v(TAG, "Finished Replication Sync ..."); } public Replication[] createReplications(Database database) { // A Couchbase Lite pull or push Replication between a local and a // remote Database. URL syncUrl; try { syncUrl = new URL(Application.SYNC_URL); } catch (MalformedURLException e) { Log.e(TAG, "Invalid Sync Url", e); throw new RuntimeException(e); } Replication pullRep = database.createPullReplication(syncUrl); /* * A Replication object represents a replication (or "sync") task that * transfers changes between a local database and a remote one. To * replicate, you first get a new Replication object from a Database, * then configure its settings, then tell it to start. The actual * replication runs asynchronously on a background thread; you can * monitor its progress by observing notifications posted by the * Replication object when its state changes, as well as notifications * posted by the database when documents are changed by the replicator. * * A typical application will create a pair of replications (push and * pull) at launch time, both pointing to the URL of a server run by the * application vendor. These stay active continuously during the * lifespan of the app, uploading and downloading documents as changes * occur and when the network is available. */ /* * One-shot vs Continuous: By default a replication runs long enough to * transfer all the changes from the source to the target database, then * quits. A continuous replication, on the other hand, will stay active * indefinitely, watching for further changes to occur and transferring * them. */ pullRep.setContinuous(false); pullRep.addChangeListener(getReplicationChangeListener()); Replication pushRep = database.createPushReplication(syncUrl); pushRep.setContinuous(false); pushRep.addChangeListener(getReplicationChangeListener()); return new Replication[] { pullRep, pushRep }; } private void initObservable() { onSyncProgressChangeObservable = new OnSyncProgressChangeObservable(); onSyncUnauthorizedObservable = new OnSyncUnauthorizedObservable(); } /** * method used to update sync progress * * @param completedCount * progress * @param totalCount * total count to be reached */ private void updateSyncProgress(int completedCount, int totalCount) { onSyncProgressChangeObservable.notifyChanges(completedCount, totalCount); } /** * * @return A delegate that can be used to listen for Replication changes */ private Replication.ChangeListener getReplicationChangeListener() { // A delegate that can be used to listen for Replication changes return new Replication.ChangeListener() { @Override public void changed(Replication.ChangeEvent event) { // The type of event raised by a Replication when any of the // following properties change: mode, running, error, completed, // total. Replication replication = event.getSource(); if (replication.getLastError() != null) { Throwable lastError = replication.getLastError(); if (lastError instanceof HttpResponseException) { HttpResponseException responseException = (HttpResponseException) lastError; if (responseException.getStatusCode() == HttpStatus.SC_UNAUTHORIZED) { onSyncUnauthorizedObservable.notifyChanges(); } } } updateSyncProgress(replication.getCompletedChangesCount(), replication.getChangesCount()); } }; } public OnSyncProgressChangeObservable getOnSyncProgressChangeObservable() { return onSyncProgressChangeObservable; } public OnSyncUnauthorizedObservable getOnSyncUnauthorizedObservable() { return onSyncUnauthorizedObservable; } /** * Observable is used to notify a group of Observer objects when a change * occurs. This class represents an observable object, or "data" in the * model-view paradigm. It represents an object that the application wants * to have observed, sync progress in this case. An observable object can * have one or more observers. An observer may be any object that implements * interface Observer. After an observable instance changes, an application * calling the Observable's notifyObservers method causes all of its * observers to be notified of the change by a call to their update method. * * @author sebas * */ public static class OnSyncProgressChangeObservable extends Observable { private void notifyChanges(int completedCount, int totalCount) { final SyncProgress progress = new SyncProgress(); progress.completedCount = completedCount; progress.totalCount = totalCount; // Sets the changed flag for this Observable. After calling // setChanged(), hasChanged() will return true Handler handler = new Handler(Looper.getMainLooper()); System.out.println("********************Hander 1"); handler.post(new Runnable() { @Override public void run() { setChanged(); // If hasChanged() returns true, calls the update() method // for every // Observer in the list of observers using the specified // argument. // Afterwards calls clearChanged(). notifyObservers(progress); } }); } } /** * @author sebas * */ public static class OnSyncUnauthorizedObservable extends Observable { private void notifyChanges() { Handler handler = new Handler(Looper.getMainLooper()); System.out.println("********************Hander 2"); handler.post(new Runnable() { @Override public void run() { setChanged(); // If hasChanged() returns true, calls the update() method // for every // Observer in the list of observers using the specified // argument. // Afterwards calls clearChanged(). notifyObservers(); } }); } } /** * @author sebas * */ public static class SyncProgress { public int completedCount; public int totalCount; } }