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// Copyright 2017 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.lib.remote.blobstore;
import com.google.common.base.Preconditions;
import com.google.common.io.ByteStreams;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ExecutionException;
/** A {@link SimpleBlobStore} implementation using a {@link ConcurrentMap}. */
public final class ConcurrentMapBlobStore implements SimpleBlobStore {
private final ConcurrentMap<String, byte[]> map;
public ConcurrentMapBlobStore(ConcurrentMap<String, byte[]> map) {
this.map = map;
}
@Override
public boolean containsKey(String key) {
return map.containsKey(key);
}
@Override
public ListenableFuture<Boolean> get(String key, OutputStream out) {
byte[] data = map.get(key);
SettableFuture<Boolean> f = SettableFuture.create();
if (data == null) {
f.set(false);
} else {
try {
out.write(data);
f.set(true);
} catch (IOException e) {
f.setException(e);
}
}
return f;
}
@Override
public boolean getActionResult(String key, OutputStream out)
throws IOException, InterruptedException {
return getFromFuture(get(key, out));
}
@Override
public void put(String key, long length, InputStream in) throws IOException {
byte[] value = ByteStreams.toByteArray(in);
Preconditions.checkState(value.length == length);
map.put(key, value);
}
@Override
public void putActionResult(String key, byte[] in) {
map.put(key, in);
}
@Override
public void close() {}
private static <T> T getFromFuture(ListenableFuture<T> f)
throws IOException, InterruptedException {
try {
return f.get();
} catch (ExecutionException e) {
if (e.getCause() instanceof IOException) {
throw (IOException) e.getCause();
}
throw new IOException(e.getCause());
}
}
}
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