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/*
* 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.apkzlib.zip.compress;
import com.android.annotations.NonNull;
import com.android.apkzlib.zip.CompressionResult;
import com.android.apkzlib.zip.Compressor;
import com.android.apkzlib.zip.utils.CloseableByteSource;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import java.util.concurrent.Executor;
/**
* 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 mExecutor;
/**
* Compressor that delegates execution into the given executor.
* @param executor the executor that will do the compress
*/
public ExecutorCompressor(@NonNull Executor executor) {
mExecutor = executor;
}
@NonNull
@Override
public ListenableFuture<CompressionResult> compress(
@NonNull final CloseableByteSource source) {
final SettableFuture<CompressionResult> future = SettableFuture.create();
mExecutor.execute(() -> {
try {
future.set(immediateCompress(source));
} catch (Exception 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;
}
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