src/main/java/com/google/devtools/build/lib/util/CpuResourceConverter.java

// Copyright 2021 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.util;

import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.actions.LocalHostCapacity;

/**
 * Converter for --local_cpu_resources, which takes an integer greater than or equal to 1, or
 * "HOST_CPUS", optionally followed by [-|*]<float>.
 */
public final class CpuResourceConverter extends ResourceConverter {
  public CpuResourceConverter() {
    super(
        ImmutableMap.of(
            "HOST_CPUS",
            () -> (int) Math.ceil(LocalHostCapacity.getLocalHostCapacity().getCpuUsage())),
        /*minValue=*/ 0,
        Integer.MAX_VALUE);
  }

  @Override
  public String getTypeDescription() {
    return "an integer, or \"HOST_CPUS\", optionally followed by [-|*]<float>.";
  }
}