| /* |
| * 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.BaseActivity.State.SORT_ORDER_LAST_MODIFIED; |
| |
| import android.app.ActivityManager; |
| import android.content.AsyncTaskLoader; |
| import android.content.ContentProviderClient; |
| import android.content.Context; |
| import android.database.Cursor; |
| import android.database.MatrixCursor; |
| import android.database.MergeCursor; |
| import android.net.Uri; |
| import android.os.Bundle; |
| import android.provider.DocumentsContract; |
| import android.provider.DocumentsContract.Document; |
| import android.provider.DocumentsContract.Root; |
| import android.text.format.DateUtils; |
| import android.util.Log; |
| |
| import com.android.documentsui.BaseActivity.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.Collection; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.Semaphore; |
| import java.util.concurrent.TimeUnit; |
| |
| public class RecentLoader extends AsyncTaskLoader<DirectoryResult> { |
| private static final boolean LOGD = true; |
| |
| // TODO: clean up cursor ownership so background thread doesn't traverse |
| // previously returned cursors for filtering/sorting; this currently races |
| // with the UI thread. |
| |
| private static final int MAX_OUTSTANDING_RECENTS = 4; |
| private static final int MAX_OUTSTANDING_RECENTS_SVELTE = 2; |
| |
| /** |
| * Time to wait for first pass to complete before returning partial results. |
| */ |
| private static final int MAX_FIRST_PASS_WAIT_MILLIS = 500; |
| |
| /** Maximum documents from a single root. */ |
| private static final int MAX_DOCS_FROM_ROOT = 64; |
| |
| /** Ignore documents older than this age. */ |
| private static final long REJECT_OLDER_THAN = 45 * DateUtils.DAY_IN_MILLIS; |
| |
| /** MIME types that should always be excluded from recents. */ |
| private static final String[] RECENT_REJECT_MIMES = new String[] { Document.MIME_TYPE_DIR }; |
| |
| private final Semaphore mQueryPermits; |
| |
| private final RootsCache mRoots; |
| private final State mState; |
| |
| 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; |
| |
| try { |
| mQueryPermits.acquire(); |
| } catch (InterruptedException e) { |
| return; |
| } |
| |
| try { |
| runInternal(); |
| } finally { |
| mQueryPermits.release(); |
| } |
| } |
| |
| public void runInternal() { |
| ContentProviderClient client = null; |
| try { |
| client = DocumentsApplication.acquireUnstableProviderOrThrow( |
| getContext().getContentResolver(), authority); |
| |
| 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); |
| |
| } catch (Exception e) { |
| Log.w(TAG, "Failed to load " + authority + ", " + rootId, e); |
| } finally { |
| ContentProviderClient.releaseQuietly(client); |
| } |
| |
| set(mWithRoot); |
| |
| mFirstPassLatch.countDown(); |
| if (mFirstPassDone) { |
| onContentChanged(); |
| } |
| } |
| |
| @Override |
| public void close() throws IOException { |
| IoUtils.closeQuietly(mWithRoot); |
| } |
| } |
| |
| public RecentLoader(Context context, RootsCache roots, State state) { |
| super(context); |
| mRoots = roots; |
| mState = state; |
| |
| // Keep clients around on high-RAM devices, since we'd be spinning them |
| // up moments later to fetch thumbnails anyway. |
| final ActivityManager am = (ActivityManager) getContext().getSystemService( |
| Context.ACTIVITY_SERVICE); |
| mQueryPermits = new Semaphore( |
| am.isLowRamDevice() ? MAX_OUTSTANDING_RECENTS_SVELTE : MAX_OUTSTANDING_RECENTS); |
| } |
| |
| @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. |
| |
| final Collection<RootInfo> roots = mRoots.getMatchingRootsBlocking(mState); |
| for (RootInfo root : roots) { |
| 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()) { |
| ProviderExecutor.forAuthority(task.authority).execute(task); |
| } |
| |
| try { |
| mFirstPassLatch.await(MAX_FIRST_PASS_WAIT_MILLIS, TimeUnit.MILLISECONDS); |
| mFirstPassDone = true; |
| } catch (InterruptedException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| final long rejectBefore = System.currentTimeMillis() - REJECT_OLDER_THAN; |
| |
| // Collect all finished tasks |
| boolean allDone = true; |
| List<Cursor> cursors = Lists.newArrayList(); |
| for (RecentTask task : mTasks.values()) { |
| if (task.isDone()) { |
| try { |
| final Cursor cursor = task.get(); |
| if (cursor == null) continue; |
| |
| final FilteringCursorWrapper filtered = new FilteringCursorWrapper( |
| cursor, mState.acceptMimes, RECENT_REJECT_MIMES, rejectBefore) { |
| @Override |
| public void close() { |
| // Ignored, since we manage cursor lifecycle internally |
| } |
| }; |
| cursors.add(filtered); |
| } catch (InterruptedException e) { |
| throw new RuntimeException(e); |
| } catch (ExecutionException e) { |
| // We already logged on other side |
| } |
| } else { |
| allDone = false; |
| } |
| } |
| |
| if (LOGD) { |
| Log.d(TAG, "Found " + cursors.size() + " of " + mTasks.size() + " recent queries done"); |
| } |
| |
| final DirectoryResult result = new DirectoryResult(); |
| result.sortOrder = SORT_ORDER_LAST_MODIFIED; |
| |
| // Hint to UI if we're still loading |
| final Bundle extras = new Bundle(); |
| if (!allDone) { |
| extras.putBoolean(DocumentsContract.EXTRA_LOADING, true); |
| } |
| |
| final Cursor merged; |
| if (cursors.size() > 0) { |
| merged = new MergeCursor(cursors.toArray(new Cursor[cursors.size()])); |
| } else { |
| // Return something when nobody is ready |
| merged = new MatrixCursor(new String[0]); |
| } |
| |
| final SortingCursorWrapper sorted = new SortingCursorWrapper(merged, result.sortOrder) { |
| @Override |
| public Bundle getExtras() { |
| return extras; |
| } |
| }; |
| |
| 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; |
| } |
| } |