| // Copyright 2024 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.skyframe.serialization; |
| |
| import static com.google.common.util.concurrent.Futures.immediateFailedFuture; |
| import static com.google.common.util.concurrent.Futures.immediateFuture; |
| import static com.google.common.util.concurrent.Futures.immediateVoidFuture; |
| |
| import com.google.common.util.concurrent.ListenableFuture; |
| import com.google.protobuf.ByteString; |
| import java.io.IOException; |
| import java.util.concurrent.ConcurrentHashMap; |
| import javax.annotation.Nullable; |
| |
| /** Encapsulates fingerprint keyed bytes storage system. */ |
| public interface FingerprintValueStore { |
| /** |
| * Associates a fingerprint with the serialized representation of some object. |
| * |
| * <p>The caller should deduplicate {@code put} calls to avoid multiple writes of the same |
| * fingerprint. |
| * |
| * @return a future that completes when the write completes |
| */ |
| ListenableFuture<Void> put(ByteString fingerprint, byte[] serializedBytes); |
| |
| /** |
| * Retrieves the serialized bytes associated with {@code fingerprint}. |
| * |
| * <p>If the given fingerprint does not exist in the store, the returned future fails with a |
| * {@link MissingFingerprintValueException}. |
| * |
| * <p>The caller should deduplicate {@code get} calls to avoid multiple fetches of the same |
| * fingerprint. |
| */ |
| ListenableFuture<byte[]> get(ByteString fingerprint) throws IOException; |
| |
| /** |
| * {@link FingerprintValueStore#get} was called with a fingerprint that does not exist in the |
| * store. |
| */ |
| final class MissingFingerprintValueException extends Exception { |
| |
| public MissingFingerprintValueException(ByteString fingerprint) { |
| this(fingerprint, /* cause= */ null); |
| } |
| |
| public MissingFingerprintValueException(ByteString fingerprint, @Nullable Throwable cause) { |
| super("No remote value for " + fingerprint, cause); |
| } |
| } |
| |
| static InMemoryFingerprintValueStore inMemoryStore() { |
| return new InMemoryFingerprintValueStore(); |
| } |
| |
| /** An in-memory {@link FingerprintValueStore} for testing. */ |
| static class InMemoryFingerprintValueStore implements FingerprintValueStore { |
| private final ConcurrentHashMap<ByteString, byte[]> fingerprintToContents = |
| new ConcurrentHashMap<>(); |
| |
| @Override |
| public ListenableFuture<Void> put(ByteString fingerprint, byte[] serializedBytes) { |
| fingerprintToContents.put(fingerprint, serializedBytes); |
| return immediateVoidFuture(); |
| } |
| |
| @Override |
| public ListenableFuture<byte[]> get(ByteString fingerprint) { |
| byte[] serializedBytes = fingerprintToContents.get(fingerprint); |
| if (serializedBytes == null) { |
| return immediateFailedFuture(new MissingFingerprintValueException(fingerprint)); |
| } |
| return immediateFuture(serializedBytes); |
| } |
| } |
| } |