Java Doc for PKGenerator.java in  » J2EE » jfox » org » jfox » entity » dao » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » jfox » org.jfox.entity.dao   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.lang.Object    org.jfox.entity.dao.PKGenerator PKGenerator public class PKGenerator (Code) 用æ?¥ç”Ÿæˆ?唯一的PK 该 PK 生æˆ?器生æˆ? 19 ä½?的唯一 long 值，精确到万分之一秒， 最å?Žä¸€ä½?为尾数，用æ?¥åœ¨é›†ç¾¤çŽ¯å¢ƒä¸‹ä¿?è¯?PK的唯一性。 该PK生æˆ?虽然ä¾?赖于时间，但是在è¿?行过程中改å?˜æ—¶é—´ä¸?会影å“?PK， 但是如果将系统时间å?Žè°ƒï¼Œç„¶å?Žé‡?æ–°å?¯åŠ¨ï¼Œæœ‰å?¯èƒ½é€ æˆ?PKé‡?å¤?。 该 PK 生æˆ?器ä¸?ä¾?赖于数æ?®åº“，相比ä¾?èµ–æ•°æ?®è¡¨çš„PK生æˆ?器，速度快，而且值å?¯è¯» author:    Young Yang Method Summary public static synchronized  PKGenerator getInstance()      public static synchronized  PKGenerator getInstance(int suffix)      public static  void main(String[] args)      public  long nextPK()      Method Detail getInstance public static synchronized PKGenerator getInstance()(Code) getInstance public static synchronized PKGenerator getInstance(int suffix)(Code) å?•æœºçŽ¯å¢ƒä¸‹ï¼Œåº”该ä¿?è¯?用相å?Œçš„ suffix 在集群环境中，ä¸?å?Œçš„机器必须æ??ä¾›ä¸?å?Œçš„ suffix æ?¥ä¿?è¯?生æˆ?çš„ID的唯一性 Parameters:   suffix - 唯一标识好 main public static void main(String[] args) throws Exception(Code) nextPK public long nextPK()(Code) 返回下一个 long åž‹ PK, format: 2006111423361344491 yyyyMMddHHmmssSSS + Macro Seconds + suffix long PK Methods inherited from java.lang.Object native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc) public boolean equals(Object obj)(Code)(Java Doc) protected void finalize() throws Throwable(Code)(Java Doc) final native public Class getClass()(Code)(Java Doc) native public int hashCode()(Code)(Java Doc) final native public void notify()(Code)(Java Doc) final native public void notifyAll()(Code)(Java Doc) public String toString()(Code)(Java Doc) final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc) final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc) final public void wait() throws InterruptedException(Code)(Java Doc)