| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.impl.store.raw.xact.ContainerLocking3 |
| 4 | |
| 5 | Copyright 1997, 2004 The Apache Software Foundation or its licensors, as applicable. |
| 6 | |
| 7 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | you may not use this file except in compliance with the License. |
| 9 | You may obtain a copy of the License at |
| 10 | |
| 11 | http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | |
| 13 | Unless required by applicable law or agreed to in writing, software |
| 14 | distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | See the License for the specific language governing permissions and |
| 17 | limitations under the License. |
| 18 | |
| 19 | */ |
| 20 | |
| 21 | package org.apache.derby.impl.store.raw.xact; |
| 22 | |
| 23 | import org.apache.derby.iapi.services.locks.LockFactory; |
| 24 | import org.apache.derby.iapi.services.locks.C_LockFactory; |
| 25 | |
| 26 | import org.apache.derby.iapi.store.raw.ContainerHandle; |
| 27 | import org.apache.derby.iapi.store.raw.ContainerLock; |
| 28 | import org.apache.derby.iapi.store.raw.Transaction; |
| 29 | |
| 30 | import org.apache.derby.iapi.error.StandardException; |
| 31 | |
| 32 | |
| 33 | /** |
| 34 | A locking policy that implements container level locking with |
| 35 | isolation degree 3. |
| 36 | |
| 37 | @see org.apache.derby.iapi.store.raw.LockingPolicy |
| 38 | */ |
| 39 | public class ContainerLocking3 extends NoLocking { |
| 40 | |
| 41 | protected final LockFactory lf; |
| 42 | |
| 43 | protected ContainerLocking3(LockFactory lf) |
| 44 | { |
| 45 | this.lf = lf; |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | Obtain a Container shared or exclusive lock until |
| 50 | the end of the nested transaction. |
| 51 | |
| 52 | @exception StandardException Standard Cloudscape error policy |
| 53 | */ |
| 54 | public boolean lockContainer( |
| 55 | Transaction t, |
| 56 | ContainerHandle container, |
| 57 | boolean waitForLock, |
| 58 | boolean forUpdate) |
| 59 | throws StandardException |
| 60 | { |
| 61 | Object qualifier = forUpdate ? ContainerLock.CX : ContainerLock.CS; |
| 62 | |
| 63 | return( |
| 64 | lf.lockObject( |
| 65 | t.getCompatibilitySpace(), t, container.getId(), qualifier, |
| 66 | waitForLock ? |
| 67 | C_LockFactory.TIMED_WAIT : C_LockFactory.NO_WAIT)); |
| 68 | } |
| 69 | |
| 70 | public int getMode() { |
| 71 | return MODE_CONTAINER; |
| 72 | } |
| 73 | |
| 74 | |
| 75 | /* |
| 76 | ** We can inherit all the others methods of NoLocking since we hold the |
| 77 | ** container lock until the end of transaction, and we don't obtain row |
| 78 | ** locks. |
| 79 | */ |
| 80 | } |