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/*
* Copyright 2014 Open Networking Laboratory
*
* 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 org.onosproject.store.trivial;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Service;
import org.onosproject.core.IdBlock;
import org.onosproject.core.IdBlockStore;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicLong;
/**
* Simple implementation of id block store.
*/
@Component(immediate = true)
@Service
public class SimpleIdBlockStore implements IdBlockStore {
private static final long DEFAULT_BLOCK_SIZE = 0x1000L;
private final Map<String, AtomicLong> topicBlocks = new ConcurrentHashMap<>();
@Override
public synchronized IdBlock getIdBlock(String topic) {
AtomicLong blockGenerator = topicBlocks.get(topic);
if (blockGenerator == null) {
blockGenerator = new AtomicLong(0);
topicBlocks.put(topic, blockGenerator);
}
Long blockBase = blockGenerator.getAndAdd(DEFAULT_BLOCK_SIZE);
return new IdBlock(blockBase, DEFAULT_BLOCK_SIZE);
}
}
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