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122 lines
4.2 KiB
122 lines
4.2 KiB
/*
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* Copyright (C) 2015 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 com.android.mtp;
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import android.os.ParcelFileDescriptor;
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import android.util.Log;
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import java.io.IOException;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import java.util.concurrent.TimeUnit;
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class PipeManager {
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/**
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* Milliseconds we wait for background thread when pausing.
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*/
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private final static long AWAIT_TERMINATION_TIMEOUT = 2000;
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final ExecutorService mExecutor;
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final MtpDatabase mDatabase;
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PipeManager(MtpDatabase database) {
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this(database, Executors.newSingleThreadExecutor());
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}
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PipeManager(MtpDatabase database, ExecutorService executor) {
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this.mDatabase = database;
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this.mExecutor = executor;
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}
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ParcelFileDescriptor readDocument(MtpManager model, Identifier identifier) throws IOException {
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final Task task = new ImportFileTask(model, identifier);
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mExecutor.execute(task);
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return task.getReadingFileDescriptor();
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}
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ParcelFileDescriptor readThumbnail(MtpManager model, Identifier identifier) throws IOException {
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final Task task = new GetThumbnailTask(model, identifier);
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mExecutor.execute(task);
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return task.getReadingFileDescriptor();
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}
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private static abstract class Task implements Runnable {
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protected final MtpManager mManager;
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protected final Identifier mIdentifier;
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protected final ParcelFileDescriptor[] mDescriptors;
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Task(MtpManager manager, Identifier identifier) throws IOException {
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mManager = manager;
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mIdentifier = identifier;
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mDescriptors = ParcelFileDescriptor.createReliablePipe();
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}
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ParcelFileDescriptor getReadingFileDescriptor() {
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return mDescriptors[0];
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}
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}
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private static class ImportFileTask extends Task {
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ImportFileTask(MtpManager model, Identifier identifier) throws IOException {
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super(model, identifier);
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}
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@Override
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public void run() {
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try {
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mManager.importFile(
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mIdentifier.mDeviceId, mIdentifier.mObjectHandle, mDescriptors[1]);
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mDescriptors[1].close();
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} catch (IOException error) {
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try {
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mDescriptors[1].closeWithError("Failed to stream a file.");
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} catch (IOException closeError) {
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Log.w(MtpDocumentsProvider.TAG, closeError.getMessage());
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}
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}
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}
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}
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private static class GetThumbnailTask extends Task {
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GetThumbnailTask(MtpManager model, Identifier identifier) throws IOException {
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super(model, identifier);
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}
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@Override
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public void run() {
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try {
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try (final ParcelFileDescriptor.AutoCloseOutputStream stream =
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new ParcelFileDescriptor.AutoCloseOutputStream(mDescriptors[1])) {
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try {
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stream.write(mManager.getThumbnail(
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mIdentifier.mDeviceId, mIdentifier.mObjectHandle));
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} catch (IOException error) {
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mDescriptors[1].closeWithError("Failed to stream a thumbnail.");
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}
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}
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} catch (IOException closeError) {
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Log.w(MtpDocumentsProvider.TAG, closeError.getMessage());
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}
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}
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}
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boolean close() throws InterruptedException {
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mExecutor.shutdownNow();
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return mExecutor.awaitTermination(AWAIT_TERMINATION_TIMEOUT, TimeUnit.MILLISECONDS);
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}
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}
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