/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* 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.
*/
package org.apache.jackrabbit.core.query.lucene;
import java.util.Map;
import java.util.WeakHashMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* <code>IOCounters</code> provides a basic mechanism to track I/O during query
* execution.
*/
public class IOCounters {
private static final Logger log = LoggerFactory.getLogger(IOCounters.class);
private static final Map<Thread, Long> counts =
new WeakHashMap<Thread, Long>();
/**
* @return the current read count for caused by the current thread.
*/
public static synchronized long getReads() {
Long count = counts.get(Thread.currentThread());
return count != null ? count : 0;
}
/**
* Increments the read count caused by the current thread.
*/
public static void incrRead() {
if (log.isDebugEnabled()) {
synchronized (IOCounters.class) {
counts.put(Thread.currentThread(), getReads() + 1);
}
}
}
}