Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/txnlock/LockMgr.java @ 33:0b9265358617
Added tag 2.1.1 for changeset a77f0a9ed93c
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:52:10 +0100 |
parents | 3dc0c5604566 |
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1 package org.dancres.blitz.txnlock; |
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2 |
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3 import org.dancres.blitz.oid.OID; |
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4 |
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5 /** |
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6 A lock mgr instance is responsible for tracking all transaction locks |
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7 for a particular Entry type. |
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8 */ |
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9 public class LockMgr { |
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10 /** |
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11 For as long as any transaction has a reference to the lock, it will |
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12 be maintained by the LockMgr. Obviously, if there are no pending |
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13 transactions there's no need to hold the lock or it's state because |
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14 the lock should be clear. If it's not clear, we have a bug!!!! :) |
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15 */ |
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16 // private SoftHashMap theLocks = new SoftHashMap(); |
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17 private LockCache theLocks = new LockCache(); |
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18 |
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19 public TxnLock getLock(OID aOID) { |
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20 return theLocks.getOrInsert(aOID); |
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21 } |
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22 |
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23 public TxnLock newLock(OID aOID) { |
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24 TxnLock myLock = new TxnLock(); |
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25 |
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26 theLocks.put(aOID, myLock); |
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27 |
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28 return myLock; |
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29 } |
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30 |
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parents:
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31 /** |
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32 Test to see if the specified OID has an active lock associated |
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33 with it. This is only truly useful in situations where the associated |
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34 Entry is in an unchanging state perhaps because it has been DELETED |
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35 or it's lease has expired. |
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36 */ |
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37 public boolean hasActiveLock(OID aOID) { |
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38 TxnLock myLock = (TxnLock) theLocks.get(aOID); |
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parents:
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39 |
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40 if (myLock != null) { |
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41 synchronized(myLock) { |
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42 return myLock.isActive(); |
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43 } |
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44 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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45 |
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46 return false; |
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47 } |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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48 |
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49 } |