spring-session ConfigureNotifyKeyspaceEventsAction 源码
spring-session ConfigureNotifyKeyspaceEventsAction 代码
文件路径：/spring-session-data-redis/src/main/java/org/springframework/session/data/redis/config/ConfigureNotifyKeyspaceEventsAction.java
/*
* Copyright 2014-2021 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.session.data.redis.config;
import java.util.Properties;
import org.springframework.dao.InvalidDataAccessApiUsageException;
import org.springframework.data.redis.connection.RedisConnection;
/**
* <p>
* Ensures that Redis Keyspace events for Generic commands and Expired events are enabled.
* For example, it might set the following:
* </p>
*
* <pre>
* config set notify-keyspace-events Egx
* </pre>
*
* <p>
* This strategy will not work if the Redis instance has been properly secured. Instead,
* the Redis instance should be configured externally and a Bean of type
* {@link ConfigureRedisAction#NO_OP} should be exposed.
* </p>
*
* @author Rob Winch
* @author Mark Paluch
* @since 1.0.1
*/
public class ConfigureNotifyKeyspaceEventsAction implements ConfigureRedisAction {
static final String CONFIG_NOTIFY_KEYSPACE_EVENTS = "notify-keyspace-events";
/*
* @see
* org.springframework.session.data.redis.config.ConfigureRedisAction#configure(org.
* springframework.data.redis.connection.RedisConnection)
*/
@Override
public void configure(RedisConnection connection) {
String notifyOptions = getNotifyOptions(connection);
String customizedNotifyOptions = notifyOptions;
if (!customizedNotifyOptions.contains("E")) {
customizedNotifyOptions += "E";
}
boolean A = customizedNotifyOptions.contains("A");
if (!(A || customizedNotifyOptions.contains("g"))) {
customizedNotifyOptions += "g";
}
if (!(A || customizedNotifyOptions.contains("x"))) {
customizedNotifyOptions += "x";
}
if (!notifyOptions.equals(customizedNotifyOptions)) {
connection.setConfig(CONFIG_NOTIFY_KEYSPACE_EVENTS, customizedNotifyOptions);
}
}
private String getNotifyOptions(RedisConnection connection) {
try {
Properties config = connection.getConfig(CONFIG_NOTIFY_KEYSPACE_EVENTS);
if (config.isEmpty()) {
return "";
}
return config.getProperty(config.stringPropertyNames().iterator().next());
}
catch (InvalidDataAccessApiUsageException ex) {
throw new IllegalStateException(
"Unable to configure Redis to keyspace notifications. See https://docs.spring.io/spring-session/docs/current/reference/html5/#api-redisindexedsessionrepository-sessiondestroyedevent",
ex);
}
}
}
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