spring AbstractHealthIndicator 源码

  • 2022-08-12
  • 浏览 (468)

springboot AbstractHealthIndicator 代码

文件路径:/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/health/AbstractHealthIndicator.java

/*
 * Copyright 2012-2022 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.boot.actuate.health;

import java.util.function.Function;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.boot.actuate.health.Health.Builder;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

/**
 * Base {@link HealthIndicator} implementations that encapsulates creation of
 * {@link Health} instance and error handling.
 * <p>
 * This implementation is only suitable if an {@link Exception} raised from
 * {@link #doHealthCheck(org.springframework.boot.actuate.health.Health.Builder)} should
 * create a {@link Status#DOWN} health status.
 *
 * @author Christian Dupuis
 * @since 1.1.0
 */
public abstract class AbstractHealthIndicator implements HealthIndicator {

	private static final String NO_MESSAGE = null;

	private static final String DEFAULT_MESSAGE = "Health check failed";

	private final Log logger = LogFactory.getLog(getClass());

	private final Function<Exception, String> healthCheckFailedMessage;

	/**
	 * Create a new {@link AbstractHealthIndicator} instance with a default
	 * {@code healthCheckFailedMessage}.
	 */
	protected AbstractHealthIndicator() {
		this(NO_MESSAGE);
	}

	/**
	 * Create a new {@link AbstractHealthIndicator} instance with a specific message to
	 * log when the health check fails.
	 * @param healthCheckFailedMessage the message to log on health check failure
	 * @since 2.0.0
	 */
	protected AbstractHealthIndicator(String healthCheckFailedMessage) {
		this.healthCheckFailedMessage = (ex) -> healthCheckFailedMessage;
	}

	/**
	 * Create a new {@link AbstractHealthIndicator} instance with a specific message to
	 * log when the health check fails.
	 * @param healthCheckFailedMessage the message to log on health check failure
	 * @since 2.0.0
	 */
	protected AbstractHealthIndicator(Function<Exception, String> healthCheckFailedMessage) {
		Assert.notNull(healthCheckFailedMessage, "HealthCheckFailedMessage must not be null");
		this.healthCheckFailedMessage = healthCheckFailedMessage;
	}

	@Override
	public final Health health() {
		Health.Builder builder = new Health.Builder();
		try {
			doHealthCheck(builder);
		}
		catch (Exception ex) {
			builder.down(ex);
		}
		logExceptionIfPresent(builder.getException());
		return builder.build();
	}

	private void logExceptionIfPresent(Throwable throwable) {
		if (throwable != null && this.logger.isWarnEnabled()) {
			String message = (throwable instanceof Exception ex) ? this.healthCheckFailedMessage.apply(ex) : null;
			this.logger.warn(StringUtils.hasText(message) ? message : DEFAULT_MESSAGE, throwable);
		}
	}

	/**
	 * Actual health check logic.
	 * @param builder the {@link Builder} to report health status and details
	 * @throws Exception any {@link Exception} that should create a {@link Status#DOWN}
	 * system status.
	 */
	protected abstract void doHealthCheck(Health.Builder builder) throws Exception;

}

相关信息

spring 源码目录

相关文章

spring AbstractReactiveHealthIndicator 源码

spring AdditionalHealthEndpointPath 源码

spring CompositeHealth 源码

spring CompositeHealthContributor 源码

spring CompositeHealthContributorMapAdapter 源码

spring CompositeHealthContributorReactiveAdapter 源码

spring CompositeReactiveHealthContributor 源码

spring CompositeReactiveHealthContributorMapAdapter 源码

spring ContributorRegistry 源码

spring DefaultContributorRegistry 源码

0  赞