org.springframework.core.metrics.DefaultApplicationStartup Maven / Gradle / Ivy
/*
* Copyright 2002-2021 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;
import java.util.Collections;
import java.util.Iterator;
import java.util.function.Supplier;
/**
* Default "no op" {@code ApplicationStartup} implementation.
*
* This variant is designed for minimal overhead and does not record events.
*
* @author Brian Clozel
*/
class DefaultApplicationStartup implements ApplicationStartup {
private static final DefaultStartupStep DEFAULT_STARTUP_STEP = new DefaultStartupStep();
@Override
public DefaultStartupStep start(String name) {
return DEFAULT_STARTUP_STEP;
}
static class DefaultStartupStep implements StartupStep {
private final DefaultTags TAGS = new DefaultTags();
@Override
public String getName() {
return "default";
}
@Override
public long getId() {
return 0L;
}
@Override
public Long getParentId() {
return null;
}
@Override
public Tags getTags() {
return this.TAGS;
}
@Override
public StartupStep tag(String key, String value) {
return this;
}
@Override
public StartupStep tag(String key, Supplier value) {
return this;
}
@Override
public void end() {
}
static class DefaultTags implements StartupStep.Tags {
@Override
public Iterator iterator() {
return Collections.emptyIterator();
}
}
}
}