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/*
* Copyright 2006 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. All rights reserved.
*
* Licensed 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 com.amazon.carbonado.sequence;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.amazon.carbonado.RepositoryException;
import com.amazon.carbonado.util.AbstractPool;
/**
* A concurrent pool of strongly referenced {@link SequenceValueProducer}
* instances mapped by name. SequenceValueProducer instances are lazily created
* and pooled.
*
* @author bcastill
* @author Brian S O'Neill
* @since 1.2
*/
public abstract class SequenceValueProducerPool
extends AbstractPool<String, SequenceValueProducer, RepositoryException>
{
public SequenceValueProducerPool() {
}
/**
* Returns a SequenceValueProducer instance for the given name, which is
* lazily created and pooled. If multiple threads are requesting upon the
* same name concurrently, at most one thread attempts to lazily create the
* SequenceValueProducer. The others wait for it to become available.
*
* @param name name of sequence
*/
public SequenceValueProducer get(String name) throws RepositoryException {
return (SequenceValueProducer) super.get(name);
}
/**
* Returns reserved values for all {@link SequenceValueProducer}s.
*
* @param log optional log to report errors; uses default log if null
*/
public void returnReservedValues(Log log) {
for (SequenceValueProducer producer : values()) {
try {
producer.returnReservedValues();
} catch (RepositoryException e) {
if (log == null) {
log = LogFactory.getLog(SequenceValueProducerPool.class);
}
log.error(e.getMessage(), e);
}
}
}
protected final SequenceValueProducer create(String name) throws RepositoryException {
return createSequenceValueProducer(name);
}
protected abstract SequenceValueProducer createSequenceValueProducer(String name)
throws RepositoryException;
}
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