| // Copyright 2014 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.ImmutableSet; |
| import com.google.common.eventbus.EventBus; |
| import com.google.devtools.build.lib.actions.ChangedFilesMessage; |
| import com.google.devtools.build.lib.actions.FileStateValue; |
| import com.google.devtools.build.lib.concurrent.ThreadSafety; |
| import com.google.devtools.build.lib.vfs.PathFragment; |
| import com.google.devtools.build.lib.vfs.RootedPath; |
| import com.google.devtools.build.skyframe.SkyKey; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| /** |
| * A package-private class intended to track a small number of modified files during the build. This |
| * class should stop recording changed files if there are too many of them, instead of holding onto |
| * a large collection of files. |
| */ |
| @ThreadSafety.ThreadCompatible |
| class SkyframeIncrementalBuildMonitor { |
| private static final int MAX_FILES = 100; |
| |
| private Set<PathFragment> files = new HashSet<>(); |
| private int fileCount; |
| |
| public void accrue(Iterable<SkyKey> invalidatedValues) { |
| for (SkyKey skyKey : invalidatedValues) { |
| if (skyKey.functionName().equals(FileStateValue.FILE_STATE)) { |
| RootedPath file = (RootedPath) skyKey.argument(); |
| maybeAddFile(file.getRootRelativePath()); |
| } |
| } |
| } |
| |
| private void maybeAddFile(PathFragment path) { |
| if (files != null) { |
| files.add(path); |
| if (files.size() >= MAX_FILES) { |
| files = null; |
| } |
| } |
| |
| fileCount++; |
| } |
| |
| public void alertListeners(EventBus eventBus) { |
| Set<PathFragment> changedFiles = (files != null) ? files : ImmutableSet.<PathFragment>of(); |
| eventBus.post(new ChangedFilesMessage(changedFiles, fileCount)); |
| } |
| } |