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/*
* Copyright 2022 Google LLC
*
* 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.google.android.libraries.mobiledatadownload;
import static java.nio.charset.StandardCharsets.UTF_8;
import android.content.Context;
import android.net.Uri;
import android.util.Log;
import com.google.android.libraries.mobiledatadownload.file.SynchronousFileStorage;
import com.google.android.libraries.mobiledatadownload.file.common.testing.StreamUtils;
import com.google.android.libraries.mobiledatadownload.internal.logging.LogUtil;
import com.google.common.base.Preconditions;
import com.google.common.util.concurrent.FluentFuture;
import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.mobiledatadownload.ClientConfigProto.ClientFileGroup;
import com.google.mobiledatadownload.DownloadConfigProto.DataFileGroup;
import com.google.mobiledatadownload.DownloadConfigProto.DownloadConditions.DeviceNetworkPolicy;
import java.io.IOException;
/**
* A file group populator that demonstrate the 2-step download. The populator will read the content
* from first group and then add the second group to MDD.
*/
public class TwoStepPopulator implements FileGroupPopulator {
private static final String TAG = "TwoStepPopulator";
private final Context context;
private final SynchronousFileStorage fileStorage;
public TwoStepPopulator(Context context, SynchronousFileStorage fileStorage) {
this.context = context;
this.fileStorage = fileStorage;
}
@Override
public ListenableFuture<Void> refreshFileGroups(MobileDataDownload mobileDataDownload) {
ListenableFuture<ClientFileGroup> step1Future =
mobileDataDownload.getFileGroup(
GetFileGroupRequest.newBuilder().setGroupName("step1-file-group").build());
return FluentFuture.from(step1Future)
.transformAsync(
clientFileGroup -> {
if (clientFileGroup == null) {
return Futures.immediateFuture(null);
}
LogUtil.d("%s: Retrieved step1-file-group from MDD", TAG);
// Now read the url from the step1.txt
Uri fileUri = Uri.parse(clientFileGroup.getFile(0).getFileUri());
String step1Content = null;
try {
step1Content = new String(StreamUtils.readFileInBytes(fileStorage, fileUri), UTF_8);
} catch (IOException e) {
LogUtil.e(e, "Fail to read from step1.txt");
}
// Add a file group where the url is read from step1.txt
DataFileGroup step2FileGroup =
TestFileGroupPopulator.createDataFileGroup(
"step2-file-group",
context.getPackageName(),
new String[] {"step2_id"},
new int[] {13},
new String[] {""},
new String[] {step1Content},
DeviceNetworkPolicy.DOWNLOAD_ON_ANY_NETWORK);
ListenableFuture<Boolean> addFileGroupFuture =
mobileDataDownload.addFileGroup(
AddFileGroupRequest.newBuilder().setDataFileGroup(step2FileGroup).build());
Futures.addCallback(
addFileGroupFuture,
new FutureCallback<Boolean>() {
@Override
public void onSuccess(Boolean result) {
Preconditions.checkState(result.booleanValue());
if (result.booleanValue()) {
Log.d(TAG, "Added file group " + step2FileGroup.getGroupName());
} else {
Log.d(TAG, "Failed to add file group " + step2FileGroup.getGroupName());
}
}
@Override
public void onFailure(Throwable t) {
Log.e(TAG, "Failed to add file group", t);
}
},
MoreExecutors.directExecutor());
return addFileGroupFuture;
},
MoreExecutors.directExecutor())
.transform(addFileGroupSucceeded -> null, MoreExecutors.directExecutor());
}
}
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