Redis Implements distributed locks

/** * @author HTTP://BLOG.CSDN.NET/JAVA2000_WL * @version <b>1.0.0</b> * * public class Redisbilllockhandle R implements Ibatchbilllockhandler {private static final Logger Logger = Loggerfactory.getlogger (redisbilllockhand        Ler.class);            private static final int default_single_expire_time = 3;        private static final int default_batch_expire_time = 6;            Private final Jedispool Jedispool; /** * Construction * @author HTTP://BLOG.CSDN.NET/JAVA2000_WL */Public Redisbilllockhandler (Jedispool Jedispool      ) {this.jedispool = Jedispool; }/** * Gets the lock if the lock is available immediately returns TRUE, otherwise false * @author HTTP://BLOG.CSDN.NET/JAVA2000_WL * @param billid Entify * @return */public boolean trylock (Ibillidentify billidentify) {return Trylock (billidenti      FY, 0L, null); /** * Lock is idle for a given wait time, the acquisition lock succeeds returns TRUE, otherwise false * @author HTTP://BLOG.CSDN.NET/JAVA2000_WL * @param bi LlidenTify * @param timeout * @param unit * @return */public boolean trylock (Ibillidentify billidentif          Y, long timeout, timeunit unit) {String key = (string) billidentify.uniqueidentify ();          Jedis Jedis = null;              try {Jedis = GetResource ();              Long nano = System.nanotime ();                  do {logger.debug ("Try Lock key:" + key);  Long i = jedis.setnx (key, key);                      Only set if if not present (i = = 1) {Jedis.expire (key, Default_single_expire_time);                      Logger.debug ("Get Lock, Key:" + key + ", expire in" + Default_single_expire_time + "seconds.");                  return boolean.true;                           } else {//Presence lock if (logger.isdebugenabled ()) {String desc = jedis.get (key);                      Logger.debug ("key:" + key + "locked by another business:" + desc);    }              } if (timeout = = 0) {break;              } thread.sleep (300);              } while ((System.nanotime ()-Nano) < Unit.tonanos (timeout));          return boolean.false;              } catch (Jedisconnectionexception je) {logger.error (Je.getmessage (), je);          Returnbrokenresource (Jedis);          } catch (Exception e) {logger.error (E.getmessage (), E);          } finally {Returnresource (Jedis);      } return boolean.false;      }/** * If lock idle immediately returns get failed wait * @author HTTP://BLOG.CSDN.NET/JAVA2000_WL * @param billidentify          */public void Lock (Ibillidentify billidentify) {string key = (string) billidentify.uniqueidentify ();          Jedis Jedis = null;              try {Jedis = GetResource ();                  do {logger.debug ("Lock key:" + key); Long i = jedis.setnx (key, key);                      if (i = = 1) {Jedis.expire (key, Default_single_expire_time);                      Logger.debug ("Get Lock, Key:" + key + ", expire in" + Default_single_expire_time + "seconds.");                  Return                          } else {if (logger.isdebugenabled ()) {String desc = jedis.get (key);                      Logger.debug ("key:" + key + "locked by another business:" + desc);               }} thread.sleep (300);          } while (true);              } catch (Jedisconnectionexception je) {logger.error (Je.getmessage (), je);          Returnbrokenresource (Jedis);          } catch (Exception e) {logger.error (E.getmessage (), E);          } finally {Returnresource (Jedis); }}/** * Release lock * @author HTTP://BLOG.CSDN.NET/JAVA2000_WL * @param billidentify * * Pub LIC void UnLock (Ibillidentify billidentify) {list<ibillidentify> List = new Arraylist<ibillidentify> (          );          List.add (billidentify);      UnLock (list); }/** * Bulk get lock If all gets immediately returns true, partial get failure returns false * @author HTTP://BLOG.CSDN.NET/JAVA2000_WL * @date 2013-7-22 pm 10:27:44 * @param billidentifylist * @return * */public boolean trylock (List<ibillidenti      Fy> billidentifylist) {return Trylock (billidentifylist, 0L, NULL); /** * Lock is idle for a given wait time, the acquisition lock returns true successfully, otherwise false * @author HTTP://BLOG.CSDN.NET/JAVA2000_WL * @para M billidentifylist * @param timeout * @param unit * @return */public boolean trylock (List<ibi          Llidentify> billidentifylist, long timeout, timeunit unit) {Jedis Jedis = null;                try {list<string> needlocking = new copyonwritearraylist<string> (); list<string> locked = NEW copyonwritearraylist<string> ();              Jedis = GetResource ();              Long nano = System.nanotime ();                  Do {//build Pipeline, Batch submit Pipeline Pipeline = jedis.pipelined ();                      for (ibillidentify identify:billidentifylist) {string key = (string) identify.uniqueidentify ();                      Needlocking.add (key);                  PIPELINE.SETNX (key, key);                  } logger.debug ("Try Lock keys:" + needlocking);                  Submit Redis Execution Count list<object> results = Pipeline.syncandreturnall ();                      for (int i = 0; i < results.size (); ++i) {Long result = (long) results.get (i);                      String key = Needlocking.get (i);                          if (result = = 1) {//Setnx succeeds, obtains lock Jedis.expire (key, Default_batch_expire_time);       Locked.add (key);               }} needlocking.removeall (locked); Locked resource Removal if (Collectionutils.isempty (needlocking)) {return true                  ; } else {//partial resource failed to lock Logger.debug ("keys:" + needlocking + "locked by Anoth                  ER business: ");                  } if (timeout = = 0) {break;                } thread.sleep (500);                } while ((System.nanotime ()-Nano) < Unit.tonanos (timeout)); Cannot get the lock, release the locked part of the object, and return the failed if (!              Collectionutils.isempty (Locked)) {Jedis.del (Locked.toarray (new string[0]));          } return false;              } catch (Jedisconnectionexception je) {logger.error (Je.getmessage (), je);          Returnbrokenresource (Jedis); } catch (Exception e) {logger.error (E.getmEssage (), E);          } finally {Returnresource (Jedis);      } return true; }/** * Bulk release lock * @author HTTP://BLOG.CSDN.NET/JAVA2000_WL * @param billidentifylist */Publ IC void UnLock (list<ibillidentify> billidentifylist) {list<string> keys = new COPYONWRITEARRAYLIST&L T          String> ();              for (ibillidentify identify:billidentifylist) {string key = (string) identify.uniqueidentify ();          Keys.add (key);          } Jedis Jedis = null;              try {Jedis = GetResource ();              Jedis.del (Keys.toarray (new string[0]));          Logger.debug ("Release lock, Keys:" + keys);              } catch (Jedisconnectionexception je) {logger.error (Je.getmessage (), je);          Returnbrokenresource (Jedis);          } catch (Exception e) {logger.error (E.getmessage (), E);      } finally {Returnresource (Jedis);    }}/** * @author http://blog.csdn.net/java2000_wl * @date 2013-7-22 pm 9:33:45 * @retur      n */Private Jedis getresource () {return jedispool.getresource ();  }/** * Destroy connection * @author HTTP://BLOG.CSDN.NET/JAVA2000_WL * @param jedis */private void          Returnbrokenresource (Jedis Jedis) {if (Jedis = = null) {return;          } try {//Fault tolerant Jedispool.returnbrokenresource (Jedis);          } catch (Exception e) {logger.error (E.getmessage (), E); }}/** * @author HTTP://BLOG.CSDN.NET/JAVA2000_WL * @param jedis * * private void Retu          Rnresource (Jedis Jedis) {if (Jedis = = null) {return;          } try {Jedispool.returnresource (Jedis);          } catch (Exception e) {logger.error (E.getmessage (), E);   }      }

　　

Redis Implements distributed locks