springboot使用lettuce连接池

springboot对连接池的使用非常智能，配置文件中添加lettuce.pool相关配置，则会使用到lettuce连接池，并将相关配置设置为连接池相关参数，（前提是这些参数是springboot配置文件中内置的，使用自定义参数应该也是可以的，有时间在研究），否则不使用，通过断点调试查看

如过使用redis连接池（无论lettuce还是jedis客户端，都需要），则需要导入如下依赖

 <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-pool2</artifactId>
 </dependency>

一、使用lettuce连接池

server.ip=192.168.102.186

spring.redis.host=${server.ip}
spring.redis.port=6379
spring.redis.timeout=20000
spring.redis.lettuce.pool.max-idle=10
spring.redis.lettuce.pool.min-idle=10
spring.redis.lettuce.pool.max-active=20
spring.redis.lettuce.pool.max-wait=10000

查看connectionFactory中相关参数

maxIdle和minIdle均为10，maxTotal为20（对应配置中max-active），maxWaitMillis为10000（对应配置中max-wait），与设置一致

查看org.apache.commons.pool2.impl.GenericObjectPoolConfig源码,如下几个字段需要注意

public class GenericObjectPoolConfig<T> extends BaseObjectPoolConfig<T> {

    /**
     * The default value for the {@code maxTotal} configuration attribute.
     * @see GenericObjectPool#getMaxTotal()
     */
    public static final int DEFAULT_MAX_TOTAL = 8;

    /**
     * The default value for the {@code maxIdle} configuration attribute.
     * @see GenericObjectPool#getMaxIdle()
     */
    public static final int DEFAULT_MAX_IDLE = 8;

    /**
     * The default value for the {@code minIdle} configuration attribute.
     * @see GenericObjectPool#getMinIdle()
     */
    public static final int DEFAULT_MIN_IDLE = 0;

    private int maxTotal = DEFAULT_MAX_TOTAL;

    private int maxIdle = DEFAULT_MAX_IDLE;

    private int minIdle = DEFAULT_MIN_IDLE;

    /**
     * Get the value for the {@code maxTotal} configuration attribute
     * for pools created with this configuration instance.
     *
     * @return  The current setting of {@code maxTotal} for this
     *          configuration instance
     *
     * @see GenericObjectPool#getMaxTotal()
     */
    public int getMaxTotal() {
        return maxTotal;
    }

    /**
     * Set the value for the {@code maxTotal} configuration attribute for
     * pools created with this configuration instance.
     *
     * @param maxTotal The new setting of {@code maxTotal}
     *        for this configuration instance
     *
     * @see GenericObjectPool#setMaxTotal(int)
     */
    public void setMaxTotal(final int maxTotal) {
        this.maxTotal = maxTotal;
    }

.....

默认maxIdle为8，minIdle为0，maxTotal为8

查看GenericObjectPoolConfig父类BaseObjectPoolConfig

public abstract class BaseObjectPoolConfig<T> extends BaseObject implements Cloneable {

    /**
     * The default value for the {@code lifo} configuration attribute.
     * @see GenericObjectPool#getLifo()
     * @see GenericKeyedObjectPool#getLifo()
     */
    public static final boolean DEFAULT_LIFO = true;

    /**
     * The default value for the {@code fairness} configuration attribute.
     * @see GenericObjectPool#getFairness()
     * @see GenericKeyedObjectPool#getFairness()
     */
    public static final boolean DEFAULT_FAIRNESS = false;

    /**
     * The default value for the {@code maxWait} configuration attribute.
     * @see GenericObjectPool#getMaxWaitMillis()
     * @see GenericKeyedObjectPool#getMaxWaitMillis()
     */
    public static final long DEFAULT_MAX_WAIT_MILLIS = -1L;

......

maxWaitMillis默认值为-1

二、去掉lettuce pool相关配置

connectionProvider下已经不存在poolConfig,说明未使用连接池