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GradlePropertiesGenerator.java
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GradlePropertiesGenerator.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.lucene.gradle;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.util.Map;
/**
* Standalone class that generates a populated gradle.properties from a template.
*
* <p>Has no dependencies outside of standard java libraries
*/
public class GradlePropertiesGenerator {
public static void main(String[] args) {
if (args.length != 2) {
System.err.println("Usage: java GradlePropertiesGenerator.java <source> <destination>");
System.exit(2);
}
try {
new GradlePropertiesGenerator().run(Paths.get(args[0]), Paths.get(args[1]));
} catch (Exception e) {
System.err.println("ERROR: " + e.getMessage());
System.exit(3);
}
}
public void run(Path source, Path destination) throws IOException {
if (!Files.exists(source)) {
throw new IOException("template file not found: " + source);
}
if (Files.exists(destination)) {
System.out.println(destination + " already exists, skipping generation.");
return;
}
// Approximate a common-sense default for running gradle/tests with parallel
// workers: half the count of available cpus but not more than 12.
var cpus = Runtime.getRuntime().availableProcessors();
var maxWorkers = (int) Math.max(1d, Math.min(cpus * 0.5d, 12));
var testsJvms = (int) Math.max(1d, Math.min(cpus * 0.5d, 12));
var replacements = Map.of("@MAX_WORKERS@", maxWorkers, "@TEST_JVMS@", testsJvms);
System.out.println("Generating gradle.properties");
String fileContent = Files.readString(source, StandardCharsets.UTF_8);
for (var entry : replacements.entrySet()) {
fileContent = fileContent.replace(entry.getKey(), String.valueOf(entry.getValue()));
}
Files.writeString(
destination, fileContent, StandardCharsets.UTF_8, StandardOpenOption.CREATE_NEW);
}
}