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現階段，互聯網越來越熱，高并發的設計越來越高，大多數開發者都開始使用redis作為中間件，用以解決高并發的問題。jedis作為redis的客戶端，使用也是越來越頻繁。很多開發者都注意到了無論是在單機模式還是分布式模式下，jedis獲得鏈接完成操作后，都必須主動歸還（也就是做鏈接的關閉）動作。為什么呢？

查看jedis源碼不難發現其緣由。

public class Jedis extends BinaryJedis implements JedisCommands, MultiKeyCommands,AdvancedJedisCommands, ScriptingCommands, BasicCommands, ClusterCommands, SentinelCommands { ........ }

Jedis繼承了父類BinaryJedis，那么再來看看BinaryJedis源碼：

public class BinaryJedis implements BasicCommands, BinaryJedisCommands, MultiKeyBinaryCommands,AdvancedBinaryJedisCommands, BinaryScriptingCommands, Closeable {protected Client client = null;protected Transaction transaction = null;protected Pipeline pipeline = null;......}

查看BinaryJedis源碼，不難發現，所有與redis操作都與Client類有關。我們就再來看看Client這個類吧。

public class Client extends BinaryClient implements Commands {public Client() {super();}public Client(final String host) {super(host);} ....... }

繼續查看BinaryClient類

public class BinaryClient extends Connection {public enum LIST_POSITION {BEFORE, AFTER;public final byte[] raw;private LIST_POSITION() {raw = SafeEncoder.encode(name());}}private boolean isInMulti;private String password;private long db;private boolean isInWatch;public BinaryClient() {super();}public BinaryClient(final String host) {super(host);} .......... }

還有父類，繼續查看父類Connection

public class Connection implements Closeable {private static final byte[][] EMPTY_ARGS = new byte[0][];private String host = Protocol.DEFAULT_HOST;private int port = Protocol.DEFAULT_PORT;private Socket socket;private RedisOutputStream outputStream;private RedisInputStream inputStream;private int pipelinedCommands = 0;private int connectionTimeout = Protocol.DEFAULT_TIMEOUT;private int soTimeout = Protocol.DEFAULT_TIMEOUT;private boolean broken = false;private boolean ssl;private SSLSocketFactory sslSocketFactory;private SSLParameters sslParameters;private HostnameVerifier hostnameVerifier;public Connection() {}public Connection(final String host) {this.host = host;}public Connection(final String host, final int port) {this.host = host;this.port = port;}public Connection(final String host, final int port, final boolean ssl) {this.host = host;this.port = port;this.ssl = ssl;}......... }

吼吼，看到這里就不難發現，jedis作為redis的客戶端鏈接服務器是通過socket來完成的。

而Redis采用的是基于內存的采用的是單進程單線程模型的KV數據庫。所以作為多線程的客戶端，jedis使用后要主動做歸還動作。否則。。。你明白的！占用socket資源咯

轉載于:https://my.oschina.net/OHC1U9jZt/blog/1537428

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