LatchedLockManager.java

package com.sleepycat.je.txn;
import java.util.Set;
import com.sleepycat.je.DatabaseException;
import com.sleepycat.je.LockStats;
import com.sleepycat.je.dbi.DatabaseImpl;
import com.sleepycat.je.dbi.EnvironmentImpl;
import com.sleepycat.je.dbi.MemoryBudget;
import com.sleepycat.je.latch.Latch;
import de.ovgu.cide.jakutil.*;
/** 
 * LatchedLockManager uses latches to implement its critical sections.
 */
public class LatchedLockManager extends LockManager {
  public LatchedLockManager(  EnvironmentImpl envImpl) throws DatabaseException {
    super(envImpl);
  }
  /** 
 * @see LockManager#attemptLock
 */
  protected LockAttemptResult attemptLock(  Long nodeId,  Locker locker,  LockType type,  boolean nonBlockingRequest) throws DatabaseException {
    int lockTableIndex=getLockTableIndex(nodeId);
    Latch latch=lockTableLatches[lockTableIndex];
    latch.acquire();
    try {
      return attemptLockInternal(nodeId,locker,type,nonBlockingRequest,lockTableIndex);
    }
  finally {
      latch.release();
    }
  }
  /** 
 * @see LockManager#makeTimeoutMsg
 */
  protected String makeTimeoutMsg(  String lockOrTxn,  Locker locker,  long nodeId,  LockType type,  LockGrantType grantType,  Lock useLock,  long timeout,  long start,  long now,  DatabaseImpl database) throws DatabaseException {
    int lockTableIndex=getLockTableIndex(nodeId);
    Latch latch=lockTableLatches[lockTableIndex];
    latch.acquire();
    try {
      return makeTimeoutMsgInternal(lockOrTxn,locker,nodeId,type,grantType,useLock,timeout,start,now,database);
    }
  finally {
      latch.release();
    }
  }
  /** 
 * @see LockManager#releaseAndNotifyTargets
 */
  protected Set releaseAndFindNotifyTargets(  long nodeId,  Lock lock,  Locker locker,  boolean removeFromLocker) throws DatabaseException {
    long nid=nodeId;
    if (nid == -1) {
      nid=lock.getNodeId().longValue();
    }
    int lockTableIndex=getLockTableIndex(nid);
    Latch latch=lockTableLatches[lockTableIndex];
    latch.acquire();
    try {
      return releaseAndFindNotifyTargetsInternal(nodeId,lock,locker,removeFromLocker,lockTableIndex);
    }
  finally {
      latch.release();
    }
  }
  /** 
 * @see LockManager#transfer
 */
  void transfer(  long nodeId,  Locker owningLocker,  Locker destLocker,  boolean demoteToRead) throws DatabaseException {
    int lockTableIndex=getLockTableIndex(nodeId);
    Latch latch=lockTableLatches[lockTableIndex];
    latch.acquire();
    try {
      transferInternal(nodeId,owningLocker,destLocker,demoteToRead,lockTableIndex);
    }
  finally {
      latch.release();
    }
  }
  /** 
 * @see LockManager#transferMultiple
 */
  void transferMultiple(  long nodeId,  Locker owningLocker,  Locker[] destLockers) throws DatabaseException {
    int lockTableIndex=getLockTableIndex(nodeId);
    Latch latch=lockTableLatches[lockTableIndex];
    latch.acquire();
    try {
      transferMultipleInternal(nodeId,owningLocker,destLockers,lockTableIndex);
    }
  finally {
      latch.release();
    }
  }
  /** 
 * @see LockManager#demote
 */
  void demote(  long nodeId,  Locker locker) throws DatabaseException {
    int lockTableIndex=getLockTableIndex(nodeId);
    Latch latch=lockTableLatches[lockTableIndex];
    latch.acquire();
    try {
      demoteInternal(nodeId,locker,lockTableIndex);
    }
  finally {
      latch.release();
    }
  }
  /** 
 * @see LockManager#isLocked
 */
  boolean isLocked(  Long nodeId) throws DatabaseException {
    int lockTableIndex=getLockTableIndex(nodeId);
    Latch latch=lockTableLatches[lockTableIndex];
    latch.acquire();
    try {
      return isLockedInternal(nodeId,lockTableIndex);
    }
  finally {
      latch.release();
    }
  }
  /** 
 * @see LockManager#isOwner
 */
  boolean isOwner(  Long nodeId,  Locker locker,  LockType type) throws DatabaseException {
    int lockTableIndex=getLockTableIndex(nodeId);
    Latch latch=lockTableLatches[lockTableIndex];
    latch.acquire();
    try {
      return isOwnerInternal(nodeId,locker,type,lockTableIndex);
    }
  finally {
      latch.release();
    }
  }
  /** 
 * @see LockManager#isWaiter
 */
  boolean isWaiter(  Long nodeId,  Locker locker) throws DatabaseException {
    int lockTableIndex=getLockTableIndex(nodeId);
    Latch latch=lockTableLatches[lockTableIndex];
    latch.acquire();
    try {
      return isWaiterInternal(nodeId,locker,lockTableIndex);
    }
  finally {
      latch.release();
    }
  }
  /** 
 * @see LockManager#nWaiters
 */
  int nWaiters(  Long nodeId) throws DatabaseException {
    int lockTableIndex=getLockTableIndex(nodeId);
    Latch latch=lockTableLatches[lockTableIndex];
    latch.acquire();
    try {
      return nWaitersInternal(nodeId,lockTableIndex);
    }
  finally {
      latch.release();
    }
  }
  /** 
 * @see LockManager#nOwners
 */
  int nOwners(  Long nodeId) throws DatabaseException {
    int lockTableIndex=getLockTableIndex(nodeId);
    Latch latch=lockTableLatches[lockTableIndex];
    latch.acquire();
    try {
      return nOwnersInternal(nodeId,lockTableIndex);
    }
  finally {
      latch.release();
    }
  }
  /** 
 * @see LockManager#getWriterOwnerLocker
 */
  Locker getWriteOwnerLocker(  Long nodeId) throws DatabaseException {
    int lockTableIndex=getLockTableIndex(nodeId);
    Latch latch=lockTableLatches[lockTableIndex];
    latch.acquire();
    try {
      return getWriteOwnerLockerInternal(nodeId,lockTableIndex);
    }
  finally {
      latch.release();
    }
  }
  /** 
 * @see LockManager#validateOwnership
 */
  protected boolean validateOwnership(  Long nodeId,  Locker locker,  LockType type,  boolean flushFromWaiters,  MemoryBudget mb) throws DatabaseException {
    int lockTableIndex=getLockTableIndex(nodeId);
    Latch latch=lockTableLatches[lockTableIndex];
    latch.acquire();
    try {
      return validateOwnershipInternal(nodeId,locker,type,flushFromWaiters,mb,lockTableIndex);
    }
  finally {
      latch.release();
    }
  }
  /** 
 * @see LockManager#dumpLockTable
 */
  protected void dumpLockTable(  LockStats stats) throws DatabaseException {
    for (int i=0; i < nLockTables; i++) {
      lockTableLatches[i].acquire();
      try {
        dumpLockTableInternal(stats,i);
      }
  finally {
        lockTableLatches[i].release();
      }
    }
  }
}