Consolidate instances of the --loading_phase_threads flag.

RELNOTES: None.
PiperOrigin-RevId: 179838936

1 files changed, 70 insertions, 0 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/runtime/LoadingPhaseThreadsOption.java b/src/main/java/com/google/devtools/build/lib/runtime/LoadingPhaseThreadsOption.java
new file mode 100644
index 0000000000..75f10006f4
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/runtime/LoadingPhaseThreadsOption.java
@@ -0,0 +1,70 @@
+// Copyright 2017 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;
+
+import com.google.devtools.common.options.Converter;
+import com.google.devtools.common.options.Option;
+import com.google.devtools.common.options.OptionDocumentationCategory;
+import com.google.devtools.common.options.OptionEffectTag;
+import com.google.devtools.common.options.OptionsBase;
+import com.google.devtools.common.options.OptionsParsingException;
+
+/** Defines the --loading_phase_threads option which is used by multiple commands. */
+public class LoadingPhaseThreadsOption extends OptionsBase {
+  @Option(
+    name = "loading_phase_threads",
+    defaultValue = LoadingPhaseThreadCountConverter.DEFAULT_VALUE,
+    documentationCategory = OptionDocumentationCategory.EXECUTION_STRATEGY,
+    effectTags = {OptionEffectTag.BAZEL_INTERNAL_CONFIGURATION},
+    converter = LoadingPhaseThreadCountConverter.class,
+    help = "Number of parallel threads to use for the loading/analysis phase."
+  )
+  public int threads;
+
+  /**
+   * A converter for loading phase thread count. Since the default is not a true constant, we create
+   * a converter here to implement the default logic.
+   */
+  public static final class LoadingPhaseThreadCountConverter implements Converter<Integer> {
+
+    private static final String DEFAULT_VALUE = "default";
+    // Reduce thread count while running tests. Test cases are typically small, and large thread
+    // pools vying for a relatively small number of CPU cores may induce non-optimal
+    // performance.
+    private static final int NON_TEST_THREADS = 200;
+    private static final int TEST_THREADS = 20;
+
+    @Override
+    public Integer convert(String input) throws OptionsParsingException {
+      if (DEFAULT_VALUE.equals(input)) {
+        return System.getenv("TEST_TMPDIR") == null ? NON_TEST_THREADS : TEST_THREADS;
+      }
+
+      try {
+        int result = Integer.decode(input);
+        if (result < 1) {
+          throw new OptionsParsingException("'" + input + "' must be at least 1");
+        }
+        return result;
+      } catch (NumberFormatException e) {
+        throw new OptionsParsingException("'" + input + "' is not an int");
+      }
+    }
+
+    @Override
+    public String getTypeDescription() {
+      return "an integer";
+    }
+  }
+}