| // Copyright 2023 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.skyframe; |
| |
| import com.google.devtools.build.lib.util.TestType; |
| import java.util.Objects; |
| |
| /** |
| * A startup flag to decide whether some {@link com.google.devtools.build.lib.cmdline.Label}s will |
| * use {@link com.google.devtools.build.lib.cmdline.LabelInterner} backed by {@link |
| * com.google.devtools.build.lib.concurrent.PooledInterner} or just the regular bazel weak interner. |
| * |
| * <p>When this flag is true, {@code LabelInterner} will be applied for all {@code Label}s so that |
| * they are able to switch between interning the instances between the regular bazel weak interner |
| * and the static global pool. |
| * |
| * <p>Applying {@code LabelInterner} can reduce memory overhead of having duplicate {@code Label} |
| * instances in both weak interner and {@link InMemoryGraphImpl}. |
| */ |
| // TODO(b/250641010): This flag is temporary to facilitate a controlled rollout. So it should be |
| // removed after the new pooled interning for `Label` instances is fully released and stable. |
| public final class UsePooledLabelInterningFlag { |
| |
| private static final boolean USE_POOLED_LABEL_INTERNER = |
| Objects.equals(System.getProperty("BAZEL_USE_POOLED_LABEL_INTERNER"), "1") |
| || TestType.isInTest(); |
| |
| public static boolean usePooledLabelInterningFlag() { |
| return USE_POOLED_LABEL_INTERNER; |
| } |
| |
| private UsePooledLabelInterningFlag() {} |
| } |