REDIS (15) JedisPool的参数testoncreate,testWhileIdle,testonborrow和testonreturn_jedis testonreturn

流程

【testonreturn参数】    JedisPool.returnResource(jedis)->pool.returnObject(jedis)->pool.getTestOnReturn()
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 【testOnborrow参数】 JedisPool.getResource()->pool.borrowObject()    |   
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                                                              _\|   \|/                
                                              PooledObjectFactory.validateObject(PooledObject<T>)
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                                                                  |--->JedisFactory.validateObject(PooledObject<Jedis>)-->ping通，不通销毁
                                                                  |
                                                                  |-->ShardedJedisFactory.validateObject(ooledObject<Jedis>)->集群所有节点ping通，不通销毁
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org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(long borrowMaxWaitMillis) throws Exception

public T borrowObject(long borrowMaxWaitMillis) throws Exception {
        assertOpen();

        AbandonedConfig ac = this.abandonedConfig;
        if (ac != null && ac.getRemoveAbandonedOnBorrow() &&
                (getNumIdle() < 2) &&
                (getNumActive() > getMaxTotal() - 3) ) {
            removeAbandoned(ac);
        }

        PooledObject<T> p = null;

        // Get local copy of current config so it is consistent for entire
        // method execution
        boolean blockWhenExhausted = getBlockWhenExhausted();

        boolean create;
        long waitTime = System.currentTimeMillis();

        while (p == null) {
            create = false;
            if (blockWhenExhausted) {
                p = idleObjects.pollFirst();
                if (p == null) {
                    p = create();
                    if (p != null) {
                        create = true;
                    }
                }
                if (p == null) {
                    if (borrowMaxWaitMillis < 0) {
                        p = idleObjects.takeFirst();
                    } else {
                        p = idleObjects.pollFirst(borrowMaxWaitMillis,
                                TimeUnit.MILLISECONDS);
                    }
                }
                if (p == null) {
                    throw new NoSuchElementException(
                            "Timeout waiting for idle object");
                }
                if (!p.allocate()) {
                    p = null;
                }
            } else {
                p = idleObjects.pollFirst();
                if (p == null) {
                    p = create();
                    if (p != null) {
                        create = true;
                    }
                }
                if (p == null) {
                    throw new NoSuchElementException("Pool exhausted");
                }
                if (!p.allocate()) {
                    p = null;
                }
            }

            if (p != null) {
                try {
                    factory.activateObject(p);
                } catch (Exception e) {
                    try {
                        destroy(p);
                    } catch (Exception e1) {
                        // Ignore - activation failure is more important
                    }
                    p = null;
                    if (create) {
                        NoSuchElementException nsee = new NoSuchElementException(
                                "Unable to activate object");
                        nsee.initCause(e);
                        throw nsee;
                    }
                }
                if (p != null && (getTestOnBorrow() || create && getTestOnCreate())) {
                    boolean validate = false;
                    Throwable validationThrowable = null;
                    try {
                        validate = factory.validateObject(p);
                    } catch (Throwable t) {
                        PoolUtils.checkRethrow(t);
                        validationThrowable = t;
                    }
                    if (!validate) {
                        try {
                            destroy(p);
                            destroyedByBorrowValidationCount.incrementAndGet();
                        } catch (Exception e) {
                            // Ignore - validation failure is more important
                        }
                        p = null;
                        if (create) {
                            NoSuchElementException nsee = new NoSuchElementException(
                                    "Unable to validate object");
                            nsee.initCause(validationThrowable);
                            throw nsee;
                        }
                    }
                }
            }
        }

        updateStatsBorrow(p, System.currentTimeMillis() - waitTime);

        return p.getObject();
    }
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