01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. The ASF licenses this file to You
04: * under the Apache License, Version 2.0 (the "License"); you may not
05: * use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
10: * Unless required by applicable law or agreed to in writing, software
11: * distributed under the License is distributed on an "AS IS" BASIS,
12: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13: * See the License for the specific language governing permissions and
14: * limitations under the License. For additional information regarding
15: * copyright in this work, please see the NOTICE file in the top level
16: * directory of this distribution.
17: */
18: package org.apache.roller.business.search.operations;
19:
20: import org.apache.commons.logging.Log;
21: import org.apache.commons.logging.LogFactory;
22: import org.apache.roller.business.search.IndexManagerImpl;
23:
24: /**
25: * @author aim4min
26: */
27: public abstract class ReadFromIndexOperation extends IndexOperation {
28: public ReadFromIndexOperation(IndexManagerImpl mgr) {
29: super (mgr);
30: }
31:
32: private static Log mLogger = LogFactory.getFactory().getInstance(
33: ReadFromIndexOperation.class);
34:
35: public final void run() {
36: try {
37: manager.getReadWriteLock().readLock().acquire();
38: doRun();
39: } catch (InterruptedException e) {
40: mLogger.info("Error acquiring read lock on index", e);
41: } finally {
42: manager.getReadWriteLock().readLock().release();
43: }
44: }
45:
46: }
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