io.camunda.application.MainSupport Maven / Gradle / Ivy
/*
* Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH under
* one or more contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright ownership.
* Licensed under the Camunda License 1.0. You may not use this file
* except in compliance with the Camunda License 1.0.
*/
package io.camunda.application;
import io.camunda.zeebe.broker.Loggers;
import io.camunda.zeebe.util.error.FatalErrorHandler;
import org.springframework.boot.WebApplicationType;
import org.springframework.boot.builder.SpringApplicationBuilder;
/**
* Utility class for shared behavior in application `main`, i.e. program entry points. This helps
* ensure all executables have some sane defaults (e.g. applying system properties, per thread
* uncaught exception handler, etc.)
*/
public final class MainSupport {
private MainSupport() {}
/**
* Sets global configuration for all executable classes:
*
*
* - Sets the default uncaught exception handler for all threads to {@link FatalErrorHandler}
*
- Sets default system properties if they haven't been overridden by the user
*
*/
public static void setDefaultGlobalConfiguration() {
Thread.setDefaultUncaughtExceptionHandler(
FatalErrorHandler.uncaughtExceptionHandler(Loggers.SYSTEM_LOGGER));
// simplify bounding direct memory usage of Netty by ensuring all servers use the same allocator
putSystemPropertyIfAbsent("io.grpc.netty.useCustomAllocator", Boolean.toString(false));
}
/**
* Returns the default {@link SpringApplicationBuilder} for all executables in the distribution
* module, with sane defaults.
*/
public static SpringApplicationBuilder createDefaultApplicationBuilder() {
return new SpringApplicationBuilder().web(WebApplicationType.SERVLET).logStartupInfo(true);
}
/**
* Sets system properties only if they haven't been set already, allowing users to override them
* via CLI or other means
*/
public static void putSystemPropertyIfAbsent(final String key, final String value) {
if (System.getProperty(key) == null) {
System.setProperty(key, value);
}
}
}