| /* |
| * Copyright (C) 2016 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.tools.build.apkzlib.zip.compress; |
| |
| import com.android.tools.build.apkzlib.zip.CompressionResult; |
| import com.android.tools.build.apkzlib.zip.Compressor; |
| import com.android.tools.build.apkzlib.zip.utils.CloseableByteSource; |
| import com.google.common.util.concurrent.ListenableFuture; |
| import com.google.common.util.concurrent.SettableFuture; |
| import java.util.concurrent.Executor; |
| import javax.annotation.Nonnull; |
| |
| /** |
| * A synchronous compressor is a compressor that computes the result of compression immediately |
| * and never returns an uncomputed future object. |
| */ |
| public abstract class ExecutorCompressor implements Compressor { |
| |
| /** |
| * The executor that does the work. |
| */ |
| @Nonnull |
| private final Executor executor; |
| |
| /** |
| * Compressor that delegates execution into the given executor. |
| * @param executor the executor that will do the compress |
| */ |
| public ExecutorCompressor(@Nonnull Executor executor) { |
| this.executor = executor; |
| } |
| |
| @Nonnull |
| @Override |
| public ListenableFuture<CompressionResult> compress( |
| @Nonnull final CloseableByteSource source) { |
| final SettableFuture<CompressionResult> future = SettableFuture.create(); |
| executor.execute(() -> { |
| try { |
| future.set(immediateCompress(source)); |
| } catch (Throwable e) { |
| future.setException(e); |
| } |
| }); |
| |
| return future; |
| } |
| |
| /** |
| * Immediately compresses a source. |
| * @param source the source to compress |
| * @return the result of compression |
| * @throws Exception failed to compress |
| */ |
| @Nonnull |
| protected abstract CompressionResult immediateCompress(@Nonnull CloseableByteSource source) |
| throws Exception; |
| } |