| // Copyright 2020 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.runtime.commands.info; |
| |
| import com.google.common.base.Supplier; |
| import com.google.devtools.build.lib.analysis.config.BuildConfiguration; |
| import com.google.devtools.build.lib.runtime.CommandEnvironment; |
| import com.google.devtools.build.lib.runtime.InfoItem; |
| import java.lang.management.GarbageCollectorMXBean; |
| import java.lang.management.ManagementFactory; |
| |
| /** Info item for the gc-count. */ |
| public final class GcCountInfoItem extends InfoItem { |
| public GcCountInfoItem() { |
| super("gc-count", "Number of garbage collection runs.", false); |
| } |
| |
| @Override |
| public byte[] get(Supplier<BuildConfiguration> configurationSupplier, CommandEnvironment env) { |
| // The documentation is not very clear on what it means to have more than |
| // one GC MXBean, so we just sum them up. |
| long gcCount = 0; |
| for (GarbageCollectorMXBean gcBean : ManagementFactory.getGarbageCollectorMXBeans()) { |
| gcCount += gcBean.getCollectionCount(); |
| } |
| return print(gcCount + ""); |
| } |
| } |