https://github.com/spring-projects/spring-framework: Spring Core (Spring IO)
  • Juergen Hoeller 
/*
 * Copyright 2002-2020 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.core.metrics;


Instruments the application startup phase using steps. 
The core container and its infrastructure components can use the ApplicationStartup to mark steps during the application startup and collect data about the execution context or their processing time. 
Author:Brian Clozel
Since:5.3
/**
 * Instruments the application startup phase using {@link StartupStep steps}.
 * <p>The core container and its infrastructure components can use the {@code ApplicationStartup}
 * to mark steps during the application startup and collect data about the execution context
 * or their processing time.
 *
 * @author Brian Clozel
 * @since 5.3
 */
public interface ApplicationStartup {

	
Default "no op" ApplicationStartup implementation. 
This variant is designed for minimal overhead and does not record data.

/**
	 * Default "no op" {@code ApplicationStartup} implementation.
	 * <p>This variant is designed for minimal overhead and does not record data.
	 */
	ApplicationStartup DEFAULT = new DefaultApplicationStartup();

	
Create a new step and marks its beginning.

A step name describes the current action or phase. This technical
name should be "." namespaced and can be reused to describe other instances of
the same step during application startup.

Params:
  • name – the step name
/**
	 * Create a new step and marks its beginning.
	 * <p>A step name describes the current action or phase. This technical
	 * name should be "." namespaced and can be reused to describe other instances of
	 * the same step during application startup.
	 * @param name the step name
	 */
	StartupStep start(String name);

}