I. Integrated Environment
Tomcat7
JDK1.7
Jedis-2.7.2
Spring-4.1.6
II. Resource Dependence
(ellipsis, a lot on the internet)
III. Integration process
1. Resource pool allocation
This is managed using Jedis's Harded JedisPool. We define the configuration file as spring-redis.xml, which reads as follows:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-3.2.xsd">
<!-- Introduce jedis configuration file -->
<context:property-placeholder location="classpath:conf/properties/redis.properties"
ignore-unresolvable="true" />
<bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
<property name="maxTotal">
<value>${redis.pool.maxActive}</value>
</property>
<property name="maxIdle">
<value>${redis.pool.maxIdle}</value>
</property>
<property name="testOnBorrow" value="true"/>
<property name="testOnReturn" value="true"/>
</bean>
<bean id="shardedJedisPool" class="redis.clients.jedis.ShardedJedisPool" scope="singleton">
<constructor-arg index="0" ref="jedisPoolConfig" />
<constructor-arg index="1">
<list>
<bean class="redis.clients.jedis.JedisShardInfo">
<constructor-arg name="host" value="${redis.uri}" />
</bean>
</list>
</constructor-arg>
</bean>
</beans>Several points for attention:
(1) If you have multiple data sources that need to be managed through <context: property-placeholder, and are reluctant to put in a configuration file, be sure to add ignore-unresolvable= "true"“
(2) Note that the new version of Jedis PoolConfig's property name is not maxActive but maxTotal, and there is no maxWait attribute. It is recommended that you take a look at the Jedis source code.
(3) ShardedJedisPool has many constructors. Select what you need (see the source code specifically). In the example, only one fragment is initialized, and a new < bean > can be added under < list > if there is a cluster by specifying the host constructor (see the format below).
(4) Of course, your spring core configuration file should have <context: component-scan base-package= "com.xxxx.xxx"/> scan component.
2. Prepare redis.properties as follows:
redis.pool.maxActive=200 redis.pool.maxIdle=50 redis.pool.minIdle=10 redis.pool.maxWaitMillis=20000 redis.pool.maxWait=300 redis.uri = redis://password@127.0.0.1:6379/0 redis.timeout=30000
Note here the format of redis.uri: redis://[password]@ [server address]: [port]/[db index]
It is recommended that you use this method, configure less content, and also customize db index, which is very suitable for development, testing and online environment switching.
3. Add spring-redis.xml to the context of web.xml as follows:
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:conf/spring-redis.xml</param-value>
</context-param>
If you have multiple data sources managed by spring (such as mysql), load them at the same time, as follows:
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:conf/spring-mybatis.xml,classpath:conf/spring-redis.xml</param-value>
</context-param>
3. All the above configurations have been completed, and the next code implementation
(1) It is recommended that you use a unified class to manage the generation and recycling of Jedis instances. The reference code is as follows: JedisDataSourceImpl.class
@Repository("jedisDS")
public class JedisDataSourceImpl implements JedisDataSource {
private static final Logger LOG = LoggerFactory.getLogger(JedisDataSourceImpl.class);
@Autowired
private ShardedJedisPool shardedJedisPool;
@Override
public ShardedJedis getRedisClient() {
ShardedJedis shardJedis = null;
try {
shardJedis = shardedJedisPool.getResource();
return shardJedis;
} catch (Exception e) {
LOG.error("[JedisDS] getRedisClent error:" + e.getMessage());
if (null != shardJedis)
shardJedis.close();
}
return null;
}
@Override
public void returnResource(ShardedJedis shardedJedis) {
shardedJedis.close();
}
@Override
public void returnResource(ShardedJedis shardedJedis, boolean broken) {
shardedJedis.close();
}
}Note here is the Jedis instance recovery. Since jedis 2.6, the original return resource method has been hinted that it will not be supported in subsequent versions. Therefore, it is not recommended that you use the return resource and reture Broken Resource methods in ShardedJedis Pool, although they are also supported in 2.7 (after all, because there are loopholes in these two methods).
(2) Write specific Jedis operation classes (fragments): RedisClientTemplate.class
@Repository("redisClientTemplate")
public class RedisClientTemplate {
private static final Logger log = LoggerFactory.getLogger(RedisClientTemplate.class);
@Autowired
private JedisDataSource redisDataSource;
public void disconnect() {
ShardedJedis shardedJedis = redisDataSource.getRedisClient();
shardedJedis.disconnect();
}
/**
* Setting a single value
*
* @param key
* @param value
* @return
*/
public String set(String key, String value) {
String result = null;
ShardedJedis shardedJedis = redisDataSource.getRedisClient();
if (shardedJedis == null) {
return result;
}
boolean broken = false;
try {
result = shardedJedis.set(key, value);
} catch (Exception e) {
log.error(e.getMessage(), e);
broken = true;
} finally {
redisDataSource.returnResource(shardedJedis, broken);
}
return result;
}
/**
* Get a single value
*
* @param key
* @return
*/
public String get(String key) {
String result = null;
ShardedJedis shardedJedis = redisDataSource.getRedisClient();
if (shardedJedis == null) {
return result;
}
boolean broken = false;
try {
result = shardedJedis.get(key);
} catch (Exception e) {
log.error(e.getMessage(), e);
broken = true;
} finally {
redisDataSource.returnResource(shardedJedis, broken);
}
return result;
}
public Boolean exists(String key) {
Boolean result = false;
ShardedJedis shardedJedis = redisDataSource.getRedisClient();
if (shardedJedis == null) {
return result;
}
boolean broken = false;
try {
result = shardedJedis.exists(key);
} catch (Exception e) {
log.error(e.getMessage(), e);
broken = true;
} finally {
redisDataSource.returnResource(shardedJedis, broken);
}
return result;
}
public String type(String key) {
String result = null;
ShardedJedis shardedJedis = redisDataSource.getRedisClient();
if (shardedJedis == null) {
return result;
}
boolean broken = false;
try {
result = shardedJedis.type(key);
} catch (Exception e) {
log.error(e.getMessage(), e);
broken = true;
} finally {
redisDataSource.returnResource(shardedJedis, broken);
}
return result;
}
/**
* Failure after a certain period of time
*
* @param key
* @param seconds
* @return
*/
public Long expire(String key, int seconds) {
Long result = null;
ShardedJedis shardedJedis = redisDataSource.getRedisClient();
if (shardedJedis == null) {
return result;
}
boolean broken = false;
try {
result = shardedJedis.expire(key, seconds);
} catch (Exception e) {
log.error(e.getMessage(), e);
broken = true;
} finally {
redisDataSource.returnResource(shardedJedis, broken);
}
return result;
}
/**
* Failure at a certain point in time
*
* @param key
* @param unixTime
* @return
*/
public Long expireAt(String key, long unixTime) {
Long result = null;
ShardedJedis shardedJedis = redisDataSource.getRedisClient();
if (shardedJedis == null) {
return result;
}
boolean broken = false;
try {
result = shardedJedis.expireAt(key, unixTime);
} catch (Exception e) {
log.error(e.getMessage(), e);
broken = true;
} finally {
redisDataSource.returnResource(shardedJedis, broken);
}
return result;
}
public Long ttl(String key) {
Long result = null;
ShardedJedis shardedJedis = redisDataSource.getRedisClient();
if (shardedJedis == null) {
return result;
}
boolean broken = false;
try {
result = shardedJedis.ttl(key);
} catch (Exception e) {
log.error(e.getMessage(), e);
broken = true;
} finally {
redisDataSource.returnResource(shardedJedis, broken);
}
return result;
}
public boolean setbit(String key, long offset, boolean value) {
ShardedJedis shardedJedis = redisDataSource.getRedisClient();
boolean result = false;
if (shardedJedis == null) {
return result;
}
boolean broken = false;
try {
result = shardedJedis.setbit(key, offset, value);
} catch (Exception e) {
log.error(e.getMessage(), e);
broken = true;
} finally {
redisDataSource.returnResource(shardedJedis, broken);
}
return result;
}
public boolean getbit(String key, long offset) {
ShardedJedis shardedJedis = redisDataSource.getRedisClient();
boolean result = false;
if (shardedJedis == null) {
return result;
}
boolean broken = false;
try {
result = shardedJedis.getbit(key, offset);
} catch (Exception e) {
log.error(e.getMessage(), e);
broken = true;
} finally {
redisDataSource.returnResource(shardedJedis, broken);
}
return result;
}
public long setRange(String key, long offset, String value) {
ShardedJedis shardedJedis = redisDataSource.getRedisClient();
long result = 0;
if (shardedJedis == null) {
return result;
}
boolean broken = false;
try {
result = shardedJedis.setrange(key, offset, value);
} catch (Exception e) {
log.error(e.getMessage(), e);
broken = true;
} finally {
redisDataSource.returnResource(shardedJedis, broken);
}
return result;
}
public String getRange(String key, long startOffset, long endOffset) {
ShardedJedis shardedJedis = redisDataSource.getRedisClient();
String result = null;
if (shardedJedis == null) {
return result;
}
boolean broken = false;
try {
result = shardedJedis.getrange(key, startOffset, endOffset);
} catch (Exception e) {
log.error(e.getMessage(), e);
broken = true;
} finally {
redisDataSource.returnResource(shardedJedis, broken);
}
return result;
}
}