| /* |
| * Copyright 2011 Google Inc. |
| * |
| * 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.ipc.invalidation.ticl.android2; |
| |
| import com.google.ipc.invalidation.external.client.SystemResources; |
| import com.google.ipc.invalidation.external.client.SystemResources.Storage; |
| import com.google.ipc.invalidation.external.client.types.Callback; |
| import com.google.ipc.invalidation.external.client.types.SimplePair; |
| import com.google.ipc.invalidation.external.client.types.Status; |
| import com.google.ipc.invalidation.ticl.InvalidationClientCore; |
| import com.google.ipc.invalidation.util.Preconditions; |
| |
| import android.content.Context; |
| |
| import java.io.DataInputStream; |
| import java.io.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| |
| /** |
| * Implementation of {@link Storage} for the Android Ticl. This implementation supports only |
| * the {@link InvalidationClientCore#CLIENT_TOKEN_KEY}. As required by Android storage |
| * implementations, it executes all callbacks synchronously. |
| * |
| */ |
| public class AndroidStorage implements Storage { |
| /** Name of the file in which state will be stored. */ |
| private static final String STATE_FILENAME = "ticl_storage.bin"; |
| |
| /** Maximum size of the file which we are willing to read. */ |
| private static final int MAX_STATE_FILE_SIZE_BYTES = 4096; |
| |
| private final Context context; |
| |
| public AndroidStorage(Context context) { |
| this.context = Preconditions.checkNotNull(context); |
| } |
| |
| @Override |
| public void setSystemResources(SystemResources resources) { |
| } |
| |
| @Override |
| public void writeKey(String key, byte[] value, Callback<Status> done) { |
| // We only support the CLIENT_TOKEN_KEY. |
| if (!key.equals(InvalidationClientCore.CLIENT_TOKEN_KEY)) { |
| done.accept(Status.newInstance(Status.Code.PERMANENT_FAILURE, "Key unsupported: " + key)); |
| return; |
| } |
| // Write the data. |
| FileOutputStream outstream = null; |
| Status status = null; |
| try { |
| outstream = context.openFileOutput(STATE_FILENAME, Context.MODE_PRIVATE); |
| outstream.write(value); |
| status = Status.newInstance(Status.Code.SUCCESS, ""); |
| } catch (FileNotFoundException exception) { |
| status = Status.newInstance(Status.Code.PERMANENT_FAILURE, "File not found: " + exception); |
| } catch (IOException exception) { |
| status = Status.newInstance(Status.Code.PERMANENT_FAILURE, "File not found: " + exception); |
| } finally { |
| if (outstream != null) { |
| try { |
| outstream.close(); |
| } catch (IOException exception) { |
| status = Status.newInstance( |
| Status.Code.PERMANENT_FAILURE, "Failed to close file: " + exception); |
| } |
| } |
| } |
| done.accept(status); |
| } |
| |
| @Override |
| public void readKey(String key, Callback<SimplePair<Status, byte[]>> done) { |
| // We only support the CLIENT_TOKEN_KEY. |
| if (!key.equals(InvalidationClientCore.CLIENT_TOKEN_KEY)) { |
| Status status = Status.newInstance(Status.Code.PERMANENT_FAILURE, "Key unsupported: " + key); |
| done.accept(SimplePair.of(status, (byte[]) null)); |
| return; |
| } |
| // Read and return the data. |
| FileInputStream instream = null; |
| SimplePair<Status, byte[]> result = null; |
| try { |
| instream = context.openFileInput(STATE_FILENAME); |
| long fileSizeBytes = instream.getChannel().size(); |
| if (fileSizeBytes > MAX_STATE_FILE_SIZE_BYTES) { |
| Status status = |
| Status.newInstance(Status.Code.PERMANENT_FAILURE, "File too big: " + fileSizeBytes); |
| result = SimplePair.of(status, (byte[]) null); |
| } |
| // Cast to int must be safe due to the above size check. |
| DataInputStream input = new DataInputStream(instream); |
| byte[] fileData = new byte[(int) fileSizeBytes]; |
| input.readFully(fileData); |
| result = SimplePair.of(Status.newInstance(Status.Code.SUCCESS, ""), fileData); |
| } catch (FileNotFoundException exception) { |
| Status status = |
| Status.newInstance(Status.Code.PERMANENT_FAILURE, "File not found: " + exception); |
| result = SimplePair.of(status, (byte[]) null); |
| } catch (IOException exception) { |
| Status status = |
| Status.newInstance(Status.Code.TRANSIENT_FAILURE, "IO exception: " + exception); |
| result = SimplePair.of(status, (byte[]) null); |
| } finally { |
| if (instream != null) { |
| try { |
| instream.close(); |
| } catch (IOException exception) { |
| Status status = |
| Status.newInstance( |
| Status.Code.TRANSIENT_FAILURE, "Failed to close file: " + exception); |
| result = SimplePair.of(status, (byte[]) null); |
| } |
| } |
| } |
| done.accept(result); |
| } |
| |
| @Override |
| public void deleteKey(String key, Callback<Boolean> done) { |
| // We only support the CLIENT_TOKEN_KEY. |
| if (!key.equals(InvalidationClientCore.CLIENT_TOKEN_KEY)) { |
| done.accept(false); |
| return; |
| } |
| if (!context.getFileStreamPath(STATE_FILENAME).exists()) { |
| // Deletion "succeeds" if the key didn't exist. |
| done.accept(true); |
| } else { |
| // Otherwise it succeeds based on whether the IO operation succeeded. |
| done.accept(context.deleteFile(STATE_FILENAME)); |
| } |
| } |
| |
| @Override |
| public void readAllKeys(Callback<SimplePair<Status, String>> keyCallback) { |
| // If the state file exists, supply the CLIENT_TOKEN_KEY as a present key. |
| if (context.getFileStreamPath(STATE_FILENAME).exists()) { |
| Status status = Status.newInstance(Status.Code.SUCCESS, ""); |
| keyCallback.accept(SimplePair.of(status, InvalidationClientCore.CLIENT_TOKEN_KEY)); |
| } |
| keyCallback.accept(null); |
| } |
| |
| static void deleteStateForTest(Context context) { |
| context.deleteFile(STATE_FILENAME); |
| } |
| } |