聊聊spring-data-redis的连接池的校验

class LettucePoolingConnectionProvider implements LettuceConnectionProvider, RedisClientProvider, DisposableBean {
    private static final Log log = LogFactory.getLog(LettucePoolingConnectionProvider.class);
    private final LettuceConnectionProvider connectionProvider;
    private final GenericObjectPoolConfig poolConfig;
    private final Map<StatefulConnection<?, ?>, GenericObjectPool<StatefulConnection<?, ?>>> poolRef = new ConcurrentHashMap(32);
    private final Map<Class<?>, GenericObjectPool<StatefulConnection<?, ?>>> pools = new ConcurrentHashMap(32);

    LettucePoolingConnectionProvider(LettuceConnectionProvider connectionProvider, LettucePoolingClientConfiguration clientConfiguration) {
        Assert.notNull(connectionProvider, "ConnectionProvider must not be null!");
        Assert.notNull(clientConfiguration, "ClientConfiguration must not be null!");
        this.connectionProvider = connectionProvider;
        this.poolConfig = clientConfiguration.getPoolConfig();
    }

    public <T extends StatefulConnection<?, ?>> T getConnection(Class<T> connectionType) {
        GenericObjectPool pool = (GenericObjectPool)this.pools.computeIfAbsent(connectionType, (poolType) -> {
            return ConnectionPoolSupport.createGenericObjectPool(() -> {
                return this.connectionProvider.getConnection(connectionType);
            }, this.poolConfig, false);
        });

        try {
            StatefulConnection<?, ?> connection = (StatefulConnection)pool.borrowObject();
            this.poolRef.put(connection, pool);
            return (StatefulConnection)connectionType.cast(connection);
        } catch (Exception var4) {
            throw new PoolException("Could not get a resource from the pool", var4);
        }
    }

    public AbstractRedisClient getRedisClient() {
        if (this.connectionProvider instanceof RedisClientProvider) {
            return ((RedisClientProvider)this.connectionProvider).getRedisClient();
        } else {
            throw new IllegalStateException(String.format("Underlying connection provider %s does not implement RedisClientProvider!", this.connectionProvider.getClass().getName()));
        }
    }

    public void release(StatefulConnection<?, ?> connection) {
        GenericObjectPool<StatefulConnection<?, ?>> pool = (GenericObjectPool)this.poolRef.remove(connection);
        if (pool == null) {
            throw new PoolException("Returned connection " + connection + " was either previously returned or does not belong to this connection provider");
        } else {
            pool.returnObject(connection);
        }
    }

    public void destroy() throws Exception {
        if (!this.poolRef.isEmpty()) {
            log.warn("LettucePoolingConnectionProvider contains unreleased connections");
            this.poolRef.forEach((connection, pool) -> {
                pool.returnObject(connection);
            });
            this.poolRef.clear();
        }

        this.pools.forEach((type, pool) -> {
            pool.close();
        });
        this.pools.clear();
    }
}

    public static <T extends StatefulConnection<?, ?>> GenericObjectPool<T> createGenericObjectPool(
            Supplier<T> connectionSupplier, GenericObjectPoolConfig config, boolean wrapConnections) {

        LettuceAssert.notNull(connectionSupplier, "Connection supplier must not be null");
        LettuceAssert.notNull(config, "GenericObjectPoolConfig must not be null");

        AtomicReference<ObjectPool<T>> poolRef = new AtomicReference<>();

        GenericObjectPool<T> pool = new GenericObjectPool<T>(new RedisPooledObjectFactory<T>(connectionSupplier), config) {

            @Override
            public T borrowObject() throws Exception {
                return wrapConnections ? wrapConnection(super.borrowObject(), this) : super.borrowObject();
            }

            @Override
            public void returnObject(T obj) {

                if (wrapConnections && obj instanceof HasTargetConnection) {
                    super.returnObject((T) ((HasTargetConnection) obj).getTargetConnection());
                    return;
                }
                super.returnObject(obj);
            }
        };

        poolRef.set(pool);

        return pool;
    }

    private static class RedisPooledObjectFactory<T extends StatefulConnection<?, ?>> extends BasePooledObjectFactory<T> {

        private final Supplier<T> connectionSupplier;

        RedisPooledObjectFactory(Supplier<T> connectionSupplier) {
            this.connectionSupplier = connectionSupplier;
        }

        @Override
        public T create() throws Exception {
            return connectionSupplier.get();
        }

        @Override
        public void destroyObject(PooledObject<T> p) throws Exception {
            p.getObject().close();
        }

        @Override
        public PooledObject<T> wrap(T obj) {
            return new DefaultPooledObject<>(obj);
        }

        @Override
        public boolean validateObject(PooledObject<T> p) {
            return p.getObject().isOpen();
        }
    }

public abstract class RedisChannelHandler<K, V> implements Closeable, ConnectionFacade {

    private static final InternalLogger logger = InternalLoggerFactory.getInstance(RedisChannelHandler.class);

    private Duration timeout;
    private CloseEvents closeEvents = new CloseEvents();

    private final RedisChannelWriter channelWriter;
    private final boolean debugEnabled = logger.isDebugEnabled();

    private volatile boolean closed;
    private volatile boolean active = true;
    private volatile ClientOptions clientOptions;

    //......

    /**
     * Notification when the connection becomes active (connected).
     */
    public void activated() {
        active = true;
        closed = false;
    }

    /**
     * Notification when the connection becomes inactive (disconnected).
     */
    public void deactivated() {
        active = false;
    }

    /**
     *
     * @return true if the connection is active and not closed.
     */
    public boolean isOpen() {
        return active;
    }

    @Override
    public synchronized void close() {

        if (debugEnabled) {
            logger.debug("close()");
        }

        if (closed) {
            logger.warn("Connection is already closed");
            return;
        }

        if (!closed) {
            active = false;
            closed = true;
            channelWriter.close();
            closeEvents.fireEventClosed(this);
            closeEvents = new CloseEvents();
        }
    }
}

private static class LettuceFactory extends BasePooledObjectFactory<StatefulConnection<byte[], byte[]>> {
        private final RedisClient client;
        private int dbIndex;

        public LettuceFactory(RedisClient client, int dbIndex) {
            this.client = client;
            this.dbIndex = dbIndex;
        }

        public void activateObject(PooledObject<StatefulConnection<byte[], byte[]>> pooledObject) throws Exception {
            if (pooledObject.getObject() instanceof StatefulRedisConnection) {
                ((StatefulRedisConnection)pooledObject.getObject()).sync().select(this.dbIndex);
            }

        }

        public void destroyObject(PooledObject<StatefulConnection<byte[], byte[]>> obj) throws Exception {
            try {
                ((StatefulConnection)obj.getObject()).close();
            } catch (Exception var3) {
                ;
            }

        }

        public boolean validateObject(PooledObject<StatefulConnection<byte[], byte[]>> obj) {
            try {
                if (obj.getObject() instanceof StatefulRedisConnection) {
                    ((StatefulRedisConnection)obj.getObject()).sync().ping();
                }

                return true;
            } catch (Exception var3) {
                return false;
            }
        }

        public StatefulConnection<byte[], byte[]> create() throws Exception {
            return this.client.connect(LettuceConnection.CODEC);
        }

        public PooledObject<StatefulConnection<byte[], byte[]>> wrap(StatefulConnection<byte[], byte[]> obj) {
            return new DefaultPooledObject(obj);
        }
    }

public class JedisConnectionFactory implements InitializingBean, DisposableBean, RedisConnectionFactory {
    //......
    private Pool<Jedis> createPool() {

        if (isRedisSentinelAware()) {
            return createRedisSentinelPool(this.sentinelConfig);
        }
        return createRedisPool();
    }

    /**
     * Creates {@link JedisSentinelPool}.
     *
     * @param config the actual {@link RedisSentinelConfiguration}. Never {@literal null}.
     * @return the {@link Pool} to use. Never {@literal null}.
     * @since 1.4
     */
    protected Pool<Jedis> createRedisSentinelPool(RedisSentinelConfiguration config) {

        GenericObjectPoolConfig poolConfig = getPoolConfig() != null ? getPoolConfig() : new JedisPoolConfig();
        return new JedisSentinelPool(config.getMaster().getName(), convertToJedisSentinelSet(config.getSentinels()),
                poolConfig, getConnectTimeout(), getReadTimeout(), getPassword(), getDatabase(), getClientName());
    }

    /**
     * Creates {@link JedisPool}.
     *
     * @return the {@link Pool} to use. Never {@literal null}.
     * @since 1.4
     */
    protected Pool<Jedis> createRedisPool() {

        return new JedisPool(getPoolConfig(), getHostName(), getPort(), getConnectTimeout(), getReadTimeout(),
                getPassword(), getDatabase(), getClientName(), isUseSsl(),
                clientConfiguration.getSslSocketFactory().orElse(null), //
                clientConfiguration.getSslParameters().orElse(null), //
                clientConfiguration.getHostnameVerifier().orElse(null));
    }
    //......
}

class JedisFactory implements PooledObjectFactory<Jedis> {
  private final AtomicReference<HostAndPort> hostAndPort = new AtomicReference<HostAndPort>();
  private final int connectionTimeout;
  private final int soTimeout;
  private final String password;
  private final int database;
  private final String clientName;
  private final boolean ssl;
  private final SSLSocketFactory sslSocketFactory;
  private SSLParameters sslParameters;
  private HostnameVerifier hostnameVerifier;

  //......

  @Override
  public boolean validateObject(PooledObject<Jedis> pooledJedis) {
    final BinaryJedis jedis = pooledJedis.getObject();
    try {
      HostAndPort hostAndPort = this.hostAndPort.get();

      String connectionHost = jedis.getClient().getHost();
      int connectionPort = jedis.getClient().getPort();

      return hostAndPort.getHost().equals(connectionHost)
          && hostAndPort.getPort() == connectionPort && jedis.isConnected()
          && jedis.ping().equals("PONG");
    } catch (final Exception e) {
      return false;
    }
  }
}