springboot使用lettuce連接池

springboot對連接池的使用非常智能，配置文件中添加lettuce.pool相關配置，則會使用到lettuce連接池，並將相關配置設置為連接池相關參數，（前提是這些參數是springboot配置文件中內置的，使用自定義參數應該也是可以的，有時間在研究），否則不使用，通過斷點調試查看

如過使用redis連接池（無論lettuce還是jedis客戶端，都需要），則需要導入如下依賴

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

 

一、使用lettuce連接池

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中相關參數

maxIdle和minIdle均為10，maxTotal為20（對應配置中max-active），maxWaitMillis為10000（對應配置中max-wait），與設置一致

 查看org.apache.commons.pool2.impl.GenericObjectPoolConfig源碼,如下幾個字段需要注意

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;
    }


.....

默認maxIdle為8，minIdle為0，maxTotal為8

查看GenericObjectPoolConfig父類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默認值為-1

 二、去掉lettuce pool相關配置

connectionProvider下已經不存在poolConfig,說明未使用連接池