org.apache.openjpa.lib.log.LogFactoryAdapter Maven / Gradle / Ivy
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* 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
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* 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.openjpa.lib.log;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* Base type that aids in adapting an external log framework to the
* {@link LogFactory}.
*
* @author Abe White
*/
public abstract class LogFactoryAdapter implements LogFactory {
// cache category to log adapters
private Map _logs = new ConcurrentHashMap();
public Log getLog(String channel) {
// no locking; OK if same adapter created multiple times
Log log = _logs.get(channel);
if (log == null) {
log = newLogAdapter(channel);
_logs.put(channel, log);
}
return log;
}
/**
* Return a log adapter for the given channel. This method may be called
* multiple times for the same channel in concurrent situations.
*/
protected abstract Log newLogAdapter(String channel);
}