| // Copyright 2015 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; |
| |
| import com.google.common.collect.ImmutableList; |
| import com.google.devtools.build.lib.cmdline.PackageIdentifier; |
| import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadCompatible; |
| import com.google.devtools.build.lib.pkgcache.RecursivePackageProvider; |
| import java.util.function.Consumer; |
| |
| /** |
| * A callback for {@link RecursivePackageProvider#streamPackagesUnderDirectory} that buffers the |
| * PackageIdentifiers it receives into batches that it delivers to a supplied {@code |
| * Consumer<ImmutableList<PackageIdentifier>>}. |
| */ |
| @ThreadCompatible |
| public class PackageIdentifierBatchingCallback |
| implements Consumer<PackageIdentifier>, AutoCloseable { |
| |
| private final Consumer<ImmutableList<PackageIdentifier>> batchResults; |
| private final int batchSize; |
| private ImmutableList.Builder<PackageIdentifier> packageIdentifiers; |
| private int bufferedPackageIds; |
| |
| public PackageIdentifierBatchingCallback( |
| Consumer<ImmutableList<PackageIdentifier>> batchResults, int batchSize) { |
| this.batchResults = batchResults; |
| this.batchSize = batchSize; |
| reset(); |
| } |
| |
| @Override |
| public void accept(PackageIdentifier path) { |
| packageIdentifiers.add(path); |
| bufferedPackageIds++; |
| if (bufferedPackageIds >= this.batchSize) { |
| flush(); |
| } |
| } |
| |
| @Override |
| public void close() { |
| flush(); |
| } |
| |
| private void flush() { |
| if (bufferedPackageIds > 0) { |
| batchResults.accept(packageIdentifiers.build()); |
| reset(); |
| } |
| } |
| |
| private void reset() { |
| packageIdentifiers = ImmutableList.builderWithExpectedSize(batchSize); |
| bufferedPackageIds = 0; |
| } |
| } |