| /* |
| * Copyright (C) 2013 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.android.documentsui; |
| |
| import static com.android.documentsui.DocumentsActivity.TAG; |
| import static com.android.documentsui.DocumentsActivity.State.SORT_ORDER_LAST_MODIFIED; |
| |
| import android.content.AsyncTaskLoader; |
| import android.content.ContentProviderClient; |
| import android.content.ContentResolver; |
| import android.content.Context; |
| import android.database.Cursor; |
| import android.database.MergeCursor; |
| import android.net.Uri; |
| import android.provider.DocumentsContract; |
| import android.provider.DocumentsContract.Document; |
| import android.provider.DocumentsContract.Root; |
| import android.util.Log; |
| |
| import com.android.documentsui.DocumentsActivity.State; |
| import com.android.documentsui.model.RootInfo; |
| import com.google.android.collect.Maps; |
| import com.google.common.collect.Lists; |
| import com.google.common.util.concurrent.AbstractFuture; |
| |
| import libcore.io.IoUtils; |
| |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.LinkedBlockingQueue; |
| import java.util.concurrent.ThreadPoolExecutor; |
| import java.util.concurrent.TimeUnit; |
| |
| public class RecentLoader extends AsyncTaskLoader<DirectoryResult> { |
| |
| public static final int MAX_OUTSTANDING_RECENTS = 2; |
| |
| /** |
| * Time to wait for first pass to complete before returning partial results. |
| */ |
| public static final int MAX_FIRST_PASS_WAIT_MILLIS = 500; |
| |
| /** |
| * Maximum documents from a single root. |
| */ |
| public static final int MAX_DOCS_FROM_ROOT = 24; |
| |
| private static final ExecutorService sExecutor = buildExecutor(); |
| |
| /** |
| * Create a bounded thread pool for fetching recents; it creates threads as |
| * needed (up to maximum) and reclaims them when finished. |
| */ |
| private static ExecutorService buildExecutor() { |
| // Create a bounded thread pool for fetching recents; it creates |
| // threads as needed (up to maximum) and reclaims them when finished. |
| final ThreadPoolExecutor executor = new ThreadPoolExecutor( |
| MAX_OUTSTANDING_RECENTS, MAX_OUTSTANDING_RECENTS, 10, TimeUnit.SECONDS, |
| new LinkedBlockingQueue<Runnable>()); |
| executor.allowCoreThreadTimeOut(true); |
| return executor; |
| } |
| |
| private final List<RootInfo> mRoots; |
| private final String[] mAcceptMimes; |
| |
| private final HashMap<RootInfo, RecentTask> mTasks = Maps.newHashMap(); |
| |
| private final int mSortOrder = State.SORT_ORDER_LAST_MODIFIED; |
| |
| private CountDownLatch mFirstPassLatch; |
| private volatile boolean mFirstPassDone; |
| |
| private DirectoryResult mResult; |
| |
| // TODO: create better transfer of ownership around cursor to ensure its |
| // closed in all edge cases. |
| |
| public class RecentTask extends AbstractFuture<Cursor> implements Runnable, Closeable { |
| public final String authority; |
| public final String rootId; |
| |
| private Cursor mWithRoot; |
| |
| public RecentTask(String authority, String rootId) { |
| this.authority = authority; |
| this.rootId = rootId; |
| } |
| |
| @Override |
| public void run() { |
| if (isCancelled()) return; |
| |
| final ContentResolver resolver = getContext().getContentResolver(); |
| final ContentProviderClient client = resolver.acquireUnstableContentProviderClient( |
| authority); |
| try { |
| final Uri uri = DocumentsContract.buildRecentDocumentsUri(authority, rootId); |
| final Cursor cursor = client.query( |
| uri, null, null, null, DirectoryLoader.getQuerySortOrder(mSortOrder)); |
| mWithRoot = new RootCursorWrapper(authority, rootId, cursor, MAX_DOCS_FROM_ROOT); |
| set(mWithRoot); |
| |
| mFirstPassLatch.countDown(); |
| if (mFirstPassDone) { |
| onContentChanged(); |
| } |
| |
| } catch (Exception e) { |
| setException(e); |
| } finally { |
| ContentProviderClient.closeQuietly(client); |
| } |
| } |
| |
| @Override |
| public void close() throws IOException { |
| IoUtils.closeQuietly(mWithRoot); |
| } |
| } |
| |
| public RecentLoader(Context context, List<RootInfo> roots, String[] acceptMimes) { |
| super(context); |
| mRoots = roots; |
| mAcceptMimes = acceptMimes; |
| } |
| |
| @Override |
| public DirectoryResult loadInBackground() { |
| if (mFirstPassLatch == null) { |
| // First time through we kick off all the recent tasks, and wait |
| // around to see if everyone finishes quickly. |
| |
| for (RootInfo root : mRoots) { |
| if ((root.flags & Root.FLAG_SUPPORTS_RECENTS) != 0) { |
| final RecentTask task = new RecentTask(root.authority, root.rootId); |
| mTasks.put(root, task); |
| } |
| } |
| |
| mFirstPassLatch = new CountDownLatch(mTasks.size()); |
| for (RecentTask task : mTasks.values()) { |
| sExecutor.execute(task); |
| } |
| |
| try { |
| mFirstPassLatch.await(MAX_FIRST_PASS_WAIT_MILLIS, TimeUnit.MILLISECONDS); |
| mFirstPassDone = true; |
| } catch (InterruptedException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| // Collect all finished tasks |
| List<Cursor> cursors = Lists.newArrayList(); |
| for (RecentTask task : mTasks.values()) { |
| if (task.isDone()) { |
| try { |
| final Cursor cursor = task.get(); |
| final FilteringCursorWrapper filtered = new FilteringCursorWrapper( |
| cursor, mAcceptMimes, new String[] { Document.MIME_TYPE_DIR }) { |
| @Override |
| public void close() { |
| // Ignored, since we manage cursor lifecycle internally |
| } |
| }; |
| cursors.add(filtered); |
| } catch (InterruptedException e) { |
| throw new RuntimeException(e); |
| } catch (ExecutionException e) { |
| Log.w(TAG, "Failed to load " + task.authority + ", " + task.rootId, e); |
| } |
| } |
| } |
| |
| final DirectoryResult result = new DirectoryResult(); |
| result.sortOrder = SORT_ORDER_LAST_MODIFIED; |
| |
| if (cursors.size() > 0) { |
| final MergeCursor merged = new MergeCursor(cursors.toArray(new Cursor[cursors.size()])); |
| final SortingCursorWrapper sorted = new SortingCursorWrapper(merged, result.sortOrder); |
| result.cursor = sorted; |
| } |
| return result; |
| } |
| |
| @Override |
| public void cancelLoadInBackground() { |
| super.cancelLoadInBackground(); |
| } |
| |
| @Override |
| public void deliverResult(DirectoryResult result) { |
| if (isReset()) { |
| IoUtils.closeQuietly(result); |
| return; |
| } |
| DirectoryResult oldResult = mResult; |
| mResult = result; |
| |
| if (isStarted()) { |
| super.deliverResult(result); |
| } |
| |
| if (oldResult != null && oldResult != result) { |
| IoUtils.closeQuietly(oldResult); |
| } |
| } |
| |
| @Override |
| protected void onStartLoading() { |
| if (mResult != null) { |
| deliverResult(mResult); |
| } |
| if (takeContentChanged() || mResult == null) { |
| forceLoad(); |
| } |
| } |
| |
| @Override |
| protected void onStopLoading() { |
| cancelLoad(); |
| } |
| |
| @Override |
| public void onCanceled(DirectoryResult result) { |
| IoUtils.closeQuietly(result); |
| } |
| |
| @Override |
| protected void onReset() { |
| super.onReset(); |
| |
| // Ensure the loader is stopped |
| onStopLoading(); |
| |
| for (RecentTask task : mTasks.values()) { |
| IoUtils.closeQuietly(task); |
| } |
| |
| IoUtils.closeQuietly(mResult); |
| mResult = null; |
| } |
| } |