spring Neo4jReactiveHealthIndicator 源码
springboot Neo4jReactiveHealthIndicator 代码
文件路径:/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/neo4j/Neo4jReactiveHealthIndicator.java
/*
* Copyright 2012-2021 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.boot.actuate.neo4j;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.neo4j.driver.Driver;
import org.neo4j.driver.exceptions.SessionExpiredException;
import org.neo4j.driver.reactive.RxResult;
import org.neo4j.driver.reactive.RxSession;
import reactor.core.publisher.Mono;
import reactor.util.retry.Retry;
import org.springframework.boot.actuate.health.AbstractReactiveHealthIndicator;
import org.springframework.boot.actuate.health.Health;
import org.springframework.boot.actuate.health.ReactiveHealthIndicator;
/**
* {@link ReactiveHealthIndicator} that tests the status of a Neo4j by executing a Cypher
* statement and extracting server and database information.
*
* @author Michael J. Simons
* @author Stephane Nicoll
* @since 2.4.0
*/
public final class Neo4jReactiveHealthIndicator extends AbstractReactiveHealthIndicator {
private static final Log logger = LogFactory.getLog(Neo4jReactiveHealthIndicator.class);
private final Driver driver;
private final Neo4jHealthDetailsHandler healthDetailsHandler;
public Neo4jReactiveHealthIndicator(Driver driver) {
this.driver = driver;
this.healthDetailsHandler = new Neo4jHealthDetailsHandler();
}
@Override
protected Mono<Health> doHealthCheck(Health.Builder builder) {
return runHealthCheckQuery()
.doOnError(SessionExpiredException.class,
(e) -> logger.warn(Neo4jHealthIndicator.MESSAGE_SESSION_EXPIRED))
.retryWhen(Retry.max(1).filter(SessionExpiredException.class::isInstance)).map((healthDetails) -> {
this.healthDetailsHandler.addHealthDetails(builder, healthDetails);
return builder.build();
});
}
Mono<Neo4jHealthDetails> runHealthCheckQuery() {
// We use WRITE here to make sure UP is returned for a server that supports
// all possible workloads
return Mono.using(() -> this.driver.rxSession(Neo4jHealthIndicator.DEFAULT_SESSION_CONFIG), (session) -> {
RxResult result = session.run(Neo4jHealthIndicator.CYPHER);
return Mono.from(result.records()).zipWhen((record) -> Mono.from(result.consume()))
.map((tuple) -> new Neo4jHealthDetails(tuple.getT1(), tuple.getT2()));
}, RxSession::close);
}
}
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spring Neo4jHealthDetailsHandler 源码
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- 本文标签: Spring Boot Java Spring
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