app/src/main/java/org/apache/roller/weblogger/business/search/operations/ReadFromIndexOperation.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  The ASF licenses this file to You
 * under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.  For additional information regarding
 * copyright in this work, please see the NOTICE file in the top level
 * directory of this distribution.
 */
package org.apache.roller.weblogger.business.search.operations;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.roller.weblogger.business.search.IndexManagerImpl;

/**
 * @author aim4min
 */
public abstract class ReadFromIndexOperation extends IndexOperation {
    public ReadFromIndexOperation(IndexManagerImpl mgr) {
        super(mgr);
    }
    
    private static Log mLogger = LogFactory.getFactory().getInstance(
            ReadFromIndexOperation.class);
    
    @Override
    public final void run() {
        try {
            manager.getReadWriteLock().readLock().lock();
            doRun();

        } catch (Exception e) {
            mLogger.error("Error acquiring read lock on index", e);
        } finally {
            manager.getReadWriteLock().readLock().unlock();
        }
    }
    
}