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/*
* Copyright 2014-2018 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
*
* http://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.data.redis.connection.lettuce;
import io.lettuce.core.RedisClient;
import io.lettuce.core.RedisURI.Builder;
import io.lettuce.core.api.StatefulConnection;
import io.lettuce.core.resource.ClientResources;
import io.lettuce.core.sentinel.api.StatefulRedisSentinelConnection;
import io.lettuce.core.sentinel.api.sync.RedisSentinelCommands;
import java.io.IOException;
import java.util.List;
import org.springframework.data.redis.ExceptionTranslationStrategy;
import org.springframework.data.redis.FallbackExceptionTranslationStrategy;
import org.springframework.data.redis.connection.NamedNode;
import org.springframework.data.redis.connection.RedisNode;
import org.springframework.data.redis.connection.RedisSentinelConnection;
import org.springframework.data.redis.connection.RedisServer;
import org.springframework.util.Assert;
/**
* @author Christoph Strobl
* @author Mark Paluch
* @since 1.5
*/
public class LettuceSentinelConnection implements RedisSentinelConnection {
private static final ExceptionTranslationStrategy EXCEPTION_TRANSLATION = new FallbackExceptionTranslationStrategy(
LettuceConverters.exceptionConverter());
private final LettuceConnectionProvider provider;
private StatefulRedisSentinelConnection connection; // no that should not be null
/**
* Creates a {@link LettuceSentinelConnection} with a dedicated client for a supplied {@link RedisNode}.
*
* @param sentinel The sentinel to connect to.
*/
public LettuceSentinelConnection(RedisNode sentinel) {
this(sentinel.getHost(), sentinel.getPort());
}
/**
* Creates a {@link LettuceSentinelConnection} with a client for the supplied {@code host} and {@code port}.
*
* @param host must not be {@literal null}.
* @param port sentinel port.
*/
public LettuceSentinelConnection(String host, int port) {
Assert.notNull(host, "Cannot create LettuceSentinelConnection using 'null' as host.");
this.provider = new DedicatedClientConnectionProvider(host, port);
init();
}
/**
* Creates a {@link LettuceSentinelConnection} with a client for the supplied {@code host} and {@code port} and reuse
* existing {@link ClientResources}.
*
* @param host must not be {@literal null}.
* @param port sentinel port.
* @param clientResources must not be {@literal null}.
*/
public LettuceSentinelConnection(String host, int port, ClientResources clientResources) {
Assert.notNull(clientResources, "Cannot create LettuceSentinelConnection using 'null' as ClientResources.");
Assert.notNull(host, "Cannot create LettuceSentinelConnection using 'null' as host.");
this.provider = new DedicatedClientConnectionProvider(host, port, clientResources);
init();
}
/**
* Creates a {@link LettuceSentinelConnection} using a supplied {@link RedisClient}.
*
* @param redisClient must not be {@literal null}.
*/
public LettuceSentinelConnection(RedisClient redisClient) {
Assert.notNull(redisClient, "Cannot create LettuceSentinelConnection using 'null' as client.");
this.provider = new LettuceConnectionProvider() {
@Override
public > T getConnection(Class t) {
return t.cast(redisClient.connectSentinel());
}
};
init();
}
/**
* Creates a {@link LettuceSentinelConnection} using a supplied redis connection.
*
* @param connection native Lettuce connection, must not be {@literal null}
*/
protected LettuceSentinelConnection(StatefulRedisSentinelConnection connection) {
Assert.notNull(connection, "Cannot create LettuceSentinelConnection using 'null' as connection.");
this.provider = new LettuceConnectionProvider() {
@Override
public > T getConnection(Class t) {
return t.cast(connection);
}
};
init();
}
/**
* Creates a {@link LettuceSentinelConnection} using a {@link LettuceConnectionProvider}.
*
* @param connectionProvider must not be {@literal null}.
* @since 2.0
*/
public LettuceSentinelConnection(LettuceConnectionProvider connectionProvider) {
Assert.notNull(connectionProvider, "LettuceConnectionProvider must not be null!");
this.provider = connectionProvider;
init();
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.RedisSentinelCommands#failover(org.springframework.data.redis.connection.NamedNode)
*/
@Override
public void failover(NamedNode master) {
Assert.notNull(master, "Redis node master must not be 'null' for failover.");
Assert.hasText(master.getName(), "Redis master name must not be 'null' or empty for failover.");
getSentinelCommands().failover(master.getName());
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.RedisSentinelCommands#masters()
*/
@Override
public List masters() {
try {
return LettuceConverters.toListOfRedisServer(getSentinelCommands().masters());
} catch (Exception e) {
throw EXCEPTION_TRANSLATION.translate(e);
}
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.RedisSentinelCommands#slaves(org.springframework.data.redis.connection.NamedNode)
*/
@Override
public List slaves(NamedNode master) {
Assert.notNull(master, "Master node cannot be 'null' when loading slaves.");
return slaves(master.getName());
}
/**
* @param masterName
* @see org.springframework.data.redis.connection.RedisSentinelCommands#slaves(org.springframework.data.redis.connection.NamedNode)
* @return
*/
public List slaves(String masterName) {
Assert.hasText(masterName, "Name of redis master cannot be 'null' or empty when loading slaves.");
try {
return LettuceConverters.toListOfRedisServer(getSentinelCommands().slaves(masterName));
} catch (Exception e) {
throw EXCEPTION_TRANSLATION.translate(e);
}
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.RedisSentinelCommands#remove(org.springframework.data.redis.connection.NamedNode)
*/
@Override
public void remove(NamedNode master) {
Assert.notNull(master, "Master node cannot be 'null' when trying to remove.");
remove(master.getName());
}
/**
* @param masterName
* @see org.springframework.data.redis.connection.RedisSentinelCommands#remove(org.springframework.data.redis.connection.NamedNode)
*/
public void remove(String masterName) {
Assert.hasText(masterName, "Name of redis master cannot be 'null' or empty when trying to remove.");
getSentinelCommands().remove(masterName);
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.RedisSentinelCommands#monitor(org.springframework.data.redis.connection.RedisServer)
*/
@Override
public void monitor(RedisServer server) {
Assert.notNull(server, "Cannot monitor 'null' server.");
Assert.hasText(server.getName(), "Name of server to monitor must not be 'null' or empty.");
Assert.hasText(server.getHost(), "Host must not be 'null' for server to monitor.");
Assert.notNull(server.getPort(), "Port must not be 'null' for server to monitor.");
Assert.notNull(server.getQuorum(), "Quorum must not be 'null' for server to monitor.");
getSentinelCommands().monitor(server.getName(), server.getHost(), server.getPort().intValue(),
server.getQuorum().intValue());
}
/*
* (non-Javadoc)
* @see java.io.Closeable#close()
*/
@Override
public void close() throws IOException {
provider.release(connection);
}
@SuppressWarnings({ "unchecked", "rawtypes" })
private void init() {
if (connection == null) {
connection = provider.getConnection(StatefulRedisSentinelConnection.class);
}
}
private RedisSentinelCommands getSentinelCommands() {
return connection.sync();
}
@Override
public boolean isOpen() {
return connection != null && connection.isOpen();
}
/**
* {@link LettuceConnectionProvider} for a dedicated client instance.
*/
private static class DedicatedClientConnectionProvider implements LettuceConnectionProvider {
private final RedisClient redisClient;
DedicatedClientConnectionProvider(String host, int port) {
Assert.notNull(host, "Cannot create LettuceSentinelConnection using 'null' as host.");
redisClient = RedisClient.create(Builder.redis(host, port).build());
}
DedicatedClientConnectionProvider(String host, int port, ClientResources clientResources) {
Assert.notNull(clientResources, "Cannot create LettuceSentinelConnection using 'null' as ClientResources.");
Assert.notNull(host, "Cannot create LettuceSentinelConnection using 'null' as host.");
redisClient = RedisClient.create(clientResources, Builder.redis(host, port).build());
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.lettuce.LettuceConnectionProvider#getConnection(java.lang.Class)
*/
@Override
public > T getConnection(Class connectionType) {
return connectionType.cast(redisClient.connectSentinel());
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.lettuce.LettuceConnectionProvider#release(io.lettuce.core.api.StatefulConnection)
*/
@Override
public void release(StatefulConnection connection) {
connection.close();
redisClient.shutdown();
}
}
}
