227 lines
8.9 KiB
Java
227 lines
8.9 KiB
Java
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/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.content;
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import android.accounts.Account;
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import android.os.Bundle;
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import android.os.IBinder;
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import android.os.Process;
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import android.os.RemoteException;
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import java.util.concurrent.atomic.AtomicInteger;
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/**
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* An abstract implementation of a SyncAdapter that spawns a thread to invoke a sync operation.
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* If a sync operation is already in progress when a startSync() request is received then an error
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* will be returned to the new request and the existing request will be allowed to continue.
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* When a startSync() is received and there is no sync operation in progress then a thread
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* will be started to run the operation and {@link #onPerformSync} will be invoked on that thread.
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* If a cancelSync() is received that matches an existing sync operation then the thread
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* that is running that sync operation will be interrupted, which will indicate to the thread
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* that the sync has been canceled.
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*/
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public abstract class AbstractThreadedSyncAdapter {
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/**
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* Kernel event log tag. Also listed in data/etc/event-log-tags.
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* @deprecated Private constant. May go away in the next release.
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*/
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@Deprecated
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public static final int LOG_SYNC_DETAILS = 2743;
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private final Context mContext;
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private final AtomicInteger mNumSyncStarts;
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private final ISyncAdapterImpl mISyncAdapterImpl;
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// all accesses to this member variable must be synchronized on mSyncThreadLock
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private SyncThread mSyncThread;
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private final Object mSyncThreadLock = new Object();
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private final boolean mAutoInitialize;
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/**
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* Creates an {@link AbstractThreadedSyncAdapter}.
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* @param context the {@link android.content.Context} that this is running within.
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* @param autoInitialize if true then sync requests that have
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* {@link ContentResolver#SYNC_EXTRAS_INITIALIZE} set will be internally handled by
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* {@link AbstractThreadedSyncAdapter} by calling
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* {@link ContentResolver#setIsSyncable(android.accounts.Account, String, int)} with 1 if it
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* is currently set to <0.
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*/
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public AbstractThreadedSyncAdapter(Context context, boolean autoInitialize) {
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mContext = context;
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mISyncAdapterImpl = new ISyncAdapterImpl();
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mNumSyncStarts = new AtomicInteger(0);
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mSyncThread = null;
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mAutoInitialize = autoInitialize;
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}
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public Context getContext() {
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return mContext;
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}
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private class ISyncAdapterImpl extends ISyncAdapter.Stub {
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public void startSync(ISyncContext syncContext, String authority, Account account,
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Bundle extras) {
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final SyncContext syncContextClient = new SyncContext(syncContext);
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boolean alreadyInProgress;
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// synchronize to make sure that mSyncThread doesn't change between when we
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// check it and when we use it
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synchronized (mSyncThreadLock) {
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if (mSyncThread == null) {
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if (mAutoInitialize
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&& extras != null
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&& extras.getBoolean(ContentResolver.SYNC_EXTRAS_INITIALIZE, false)) {
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if (ContentResolver.getIsSyncable(account, authority) < 0) {
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ContentResolver.setIsSyncable(account, authority, 1);
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}
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syncContextClient.onFinished(new SyncResult());
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return;
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}
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mSyncThread = new SyncThread(
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"SyncAdapterThread-" + mNumSyncStarts.incrementAndGet(),
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syncContextClient, authority, account, extras);
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mSyncThread.start();
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alreadyInProgress = false;
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} else {
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alreadyInProgress = true;
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}
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}
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// do this outside since we don't want to call back into the syncContext while
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// holding the synchronization lock
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if (alreadyInProgress) {
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syncContextClient.onFinished(SyncResult.ALREADY_IN_PROGRESS);
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}
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}
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public void cancelSync(ISyncContext syncContext) {
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// synchronize to make sure that mSyncThread doesn't change between when we
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// check it and when we use it
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final SyncThread syncThread;
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synchronized (mSyncThreadLock) {
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syncThread = mSyncThread;
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}
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if (syncThread != null
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&& syncThread.mSyncContext.getSyncContextBinder() == syncContext.asBinder()) {
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onSyncCanceled();
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}
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}
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public void initialize(Account account, String authority) throws RemoteException {
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Bundle extras = new Bundle();
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extras.putBoolean(ContentResolver.SYNC_EXTRAS_INITIALIZE, true);
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startSync(null, authority, account, extras);
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}
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}
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/**
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* The thread that invokes {@link AbstractThreadedSyncAdapter#onPerformSync}. It also acquires
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* the provider for this sync before calling onPerformSync and releases it afterwards. Cancel
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* this thread in order to cancel the sync.
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*/
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private class SyncThread extends Thread {
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private final SyncContext mSyncContext;
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private final String mAuthority;
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private final Account mAccount;
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private final Bundle mExtras;
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private SyncThread(String name, SyncContext syncContext, String authority,
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Account account, Bundle extras) {
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super(name);
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mSyncContext = syncContext;
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mAuthority = authority;
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mAccount = account;
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mExtras = extras;
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}
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public void run() {
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Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
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if (isCanceled()) {
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return;
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}
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SyncResult syncResult = new SyncResult();
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ContentProviderClient provider = null;
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try {
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provider = mContext.getContentResolver().acquireContentProviderClient(mAuthority);
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if (provider != null) {
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AbstractThreadedSyncAdapter.this.onPerformSync(mAccount, mExtras,
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mAuthority, provider, syncResult);
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} else {
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syncResult.databaseError = true;
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}
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} finally {
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if (provider != null) {
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provider.release();
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}
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if (!isCanceled()) {
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mSyncContext.onFinished(syncResult);
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}
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// synchronize so that the assignment will be seen by other threads
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// that also synchronize accesses to mSyncThread
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synchronized (mSyncThreadLock) {
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mSyncThread = null;
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}
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}
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}
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private boolean isCanceled() {
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return Thread.currentThread().isInterrupted();
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}
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}
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/**
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* @return a reference to the IBinder of the SyncAdapter service.
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*/
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public final IBinder getSyncAdapterBinder() {
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return mISyncAdapterImpl.asBinder();
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}
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/**
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* Perform a sync for this account. SyncAdapter-specific parameters may
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* be specified in extras, which is guaranteed to not be null. Invocations
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* of this method are guaranteed to be serialized.
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*
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* @param account the account that should be synced
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* @param extras SyncAdapter-specific parameters
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* @param authority the authority of this sync request
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* @param provider a ContentProviderClient that points to the ContentProvider for this
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* authority
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* @param syncResult SyncAdapter-specific parameters
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*/
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public abstract void onPerformSync(Account account, Bundle extras,
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String authority, ContentProviderClient provider, SyncResult syncResult);
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/**
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* Indicates that a sync operation has been canceled. This will be invoked on a separate
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* thread than the sync thread and so you must consider the multi-threaded implications
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* of the work that you do in this method.
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*
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*/
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public void onSyncCanceled() {
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final SyncThread syncThread;
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synchronized (mSyncThreadLock) {
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syncThread = mSyncThread;
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}
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if (syncThread != null) {
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syncThread.interrupt();
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}
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}
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}
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