Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

JavaÏß³ÌÖ®Read Write Lock Pattern

Read-Write Lock PatternµÄ²ÎÓëÕߣº
1. Reader£¨¶ÁÈ¡Õߣ©²ÎÓëÕß
    Reader²ÎÓëÕß»á¶ÔSharedResource²ÎÓëÕß½øÐÐread¡£
2. Writer£¨Ð´ÈëÕߣ©²ÎÓëÕß
    Writer²ÎÓëÕß»á¶ÔSharedResource²ÎÓëÕß½øÐÐwrite¡£
3. SharedResource£¨¹²Ïí×ÊÔ´£©²ÎÓëÕß
    SharedResource²ÎÓëÕß´ú±íReaderÓëWriterËù¹²ÏíµÄ×ÊÔ´¡£
    SharedResource²ÎÓëÕß»áÌṩ²»»á¸Ä±äÄÚ²¿×´Ì¬µÄ²Ù×÷£¨read£©ºÍ»á¸Ä±äÄÚ²¿×´Ì¬µÄ²Ù×÷£¨write£©¡£
4. ReadWriteLock£¨¶ÁдÓÃËø¶¨£©²ÎÓëÕß
    ReadWriteLock²ÎÓëÕßÌṩÁ˶ÔSharedResource²ÎÓëÕß½øÐÐread²Ù×÷Óë½øÐÐwrite²Ù×÷ʱÐèÒªµÄËø¶¨¡£
    ΪÁËÍê³Éread²Ù×÷£¬ÌṩÁËreadLockÓëreadUnlock¡£
    ΪÁËÍê³Éwrite²Ù×÷£¬ÌṩÁËwriteLockºÍwriteUnlock¡£
------------------------------
Read-Write Lock PatternÊʺ϶ÁÈ¡±ÈдÈë´ÎÊýƵ·±µÄÇé¿ö¡£
Read-Write Lock PatternÀîÓÀÀÖ¶ÁÈ¡²Ù×÷±Ë´ËÖ®¼ä²»»á³åÍ»µÄÌØÐÔ£¬Ê¹µÃ¶à¸öReader²ÎÓëÕß¿ÉÒÔͬʱ½øÐÐread£¬ÒÔÌáÉý³ÌÐòµÄÐÔÄÜ¡£
²»¹ýµ±Ð´Èë²Ù×÷ƵÂʽϸßʱ£¬Writer²ÎÓëÕ߻ᾭ³£×èÀ¹Reader²ÎÓëÕßµÄread²Ù×÷µÄ½øÐУ¬ÕâÑùÒ²¾ÍÎÞ·¨Õ¹ÏÖRead-Write Lock PatternµÄÓŵãÁË¡£
------------------------------
Ò»¸ö ReadWriteLock²ÎÓëÕßµÄʵÏÖ£º
public final class ReadWriteLock{
private int readingReaders = 0; // ʵ¼ÊÕýÔÚ¶ÁÈ¡µÄÏß³ÌÊý
private int waitingWriters = 0; // ÕýÔڵȴýдÈëµÄÏß³ÌÊý
private int writingWriters = 0; // ʵ¼ÊÕýÔÚдÈëµÄÏß³ÌÊý
private boolean preferWriter = true; // ÊÇ·ñдÈëÓÅÏÈ
public synchronized void readLock() throws InterruptedException{
while(writingWriters >0 ||(preferWriter && waitingWriters >0)){
wait();
}
readingReaders++;
}
public synchronized void readUnlock() throws InterruptedException{
readingReaders--;
notifyAll();
}
public synchronized void writeLock() throws InterruptedException{
waitingWriters++;
try{
while(readingReaders>0||writingWriters>0){
wait();
}
}finally{
waitingWriters--;
}
writingWriters++;
}
public synchronized void writeUnlock() throws InterruptedException{
writingWriters--;
noti


Ïà¹ØÎĵµ£º

JAVA·´Éä»úÖÆ

JAVA·´Éä»úÖÆ
¸ÅÊö
¡¡¡¡ÓÐʱºòÎÒÃÇ˵ij¸öÓïÑÔ¾ßÓкÜÇ¿µÄ¶¯Ì¬ÐÔ£¬ÓÐʱºòÎÒÃÇ»áÇø·Ö¶¯Ì¬ºÍ¾²Ì¬µÄ²»Í¬¼¼ÊõÓë×÷·¨¡£ÎÒÃÇÀÊÀÊÉϿڶ¯Ì¬°ó¶¨£¨dynamic binding£©¡¢¶¯Ì¬Á´½Ó£¨dynamic linking£©¡¢¶¯Ì¬¼ÓÔØ£¨dynamic loading£©µÈ¡£È»¶ø“¶¯Ì¬”Ò»´ÊÆäʵûÓоø¶Ô¶øÆÕ±éÊÊÓõÄÑϸñ¶¨Ò壬ÓÐʱºòÉõÖÁÏñ¶ÔÏóµ¼Ïòµ±³õ±»µ¼Èë±à³ ......

java³£ÓÃÀàµÄʹÓ÷½·¨

java³£ÓÃÀàµÄʹÓ÷½·¨
Interger£ºÕûÊýÀàÐÍ
£±¡¢ÊôÐÔ¡£
static int MAX_VALUE£º·µ»Ø×î´óµÄÕûÐÍÊý£»
static int MIN_VALUE£º·µ»Ø×îСµÄÕûÐÍÊý£»
static Class TYPE £º·µ»Øµ±Ç°ÀàÐÍ¡£
Àý×Ó£º
´úÂë:
System.out.println("Integer.MAX_VALUE: " + Integer.MAX_VALUE );
½á¹ûΪ£ºInteger.MAX_VALUE: 2147483647
&nb ......

32λ²»¿ÉÄæ¼ÓÃÜËã·¨JavaʵÏÖ

¼ÓÃܺóÊÇÒ»¸ö32λ´óд×Öĸ×éºÏÐÎʽ£¬²¢ÇÒ±¾¼ÓÃÜ·½·¨²»¿ÉÄæ£¡
public String kljm(String dm,String kl)
{
String mw, cmm;
int k, i, tmp, a, hf, lf, bytes = 16;
int mm[], l,rand_seed;
rand_seed = 12345;
int len=kl.length();
if(len>=12) len=12;
mw =kl.substring(0,len) + dm.trim();
l = ......

TEA¼ÓÃÜËã·¨java°æ

Õâ¸öËã·¨¼òµ¥,¶øÇÒЧÂʸß,ÿ´Î¿ÉÒÔ²Ù×÷8¸ö×Ö½ÚµÄÊý¾Ý,¼ÓÃܽâÃܵÄKEYΪ16×Ö½Ú,¼´°üº¬4¸öintÊý¾ÝµÄintÐÍÊý×é,¼ÓÃÜÂÖÊýӦΪ8µÄ±¶Êý,Ò»°ã±È½Ï³£ÓõÄÂÖÊýΪ64,32,16,ÍÆ¼öÓÃ64ÂÖ.
Ô´´úÂëÈçÏÂ:
/** *//**
* TeaËã·¨
* ÿ´Î²Ù×÷¿ÉÒÔ´¦Àí8¸ö×Ö½ÚÊý¾Ý
* KEYΪ16×Ö½Ú,ӦΪ°üº¬4¸öintÐÍÊýµÄint[]£¬Ò»¸öintΪ4¸ö×Ö½Ú
* ¼ÓÃܽâÃÜÂÖÊ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ