| package org.onosproject.store.core.impl; |
| |
| import com.google.common.collect.Maps; |
| import org.apache.felix.scr.annotations.Activate; |
| import org.apache.felix.scr.annotations.Component; |
| import org.apache.felix.scr.annotations.Deactivate; |
| import org.apache.felix.scr.annotations.Reference; |
| import org.apache.felix.scr.annotations.ReferenceCardinality; |
| import org.apache.felix.scr.annotations.Service; |
| import org.onosproject.core.IdBlock; |
| import org.onosproject.core.IdBlockStore; |
| import org.onosproject.store.service.AtomicCounter; |
| import org.onosproject.store.service.StorageException; |
| import org.onosproject.store.service.StorageService; |
| import org.slf4j.Logger; |
| |
| import java.util.Map; |
| |
| import static org.onlab.util.Tools.delay; |
| import static org.slf4j.LoggerFactory.getLogger; |
| |
| /** |
| * Implementation of {@code IdBlockStore} using {@code AtomicCounter}. |
| */ |
| @Component(immediate = true, enabled = true) |
| @Service |
| public class ConsistentIdBlockStore implements IdBlockStore { |
| |
| private static final int MAX_TRIES = 3; |
| private static final int RETRY_DELAY_MS = 2_000; |
| |
| private final Logger log = getLogger(getClass()); |
| private final Map<String, AtomicCounter> topicCounters = Maps.newConcurrentMap(); |
| |
| private static final long DEFAULT_BLOCK_SIZE = 0x100000L; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected StorageService storageService; |
| |
| @Activate |
| public void activate() { |
| log.info("Started"); |
| } |
| |
| @Deactivate |
| public void deactivate() { |
| log.info("Stopped"); |
| } |
| |
| @Override |
| public IdBlock getIdBlock(String topic) { |
| AtomicCounter counter = topicCounters |
| .computeIfAbsent(topic, |
| name -> storageService.atomicCounterBuilder() |
| .withName(name) |
| .build()); |
| Throwable exc = null; |
| for (int i = 0; i < MAX_TRIES; i++) { |
| try { |
| Long blockBase = counter.getAndAdd(DEFAULT_BLOCK_SIZE); |
| return new IdBlock(blockBase, DEFAULT_BLOCK_SIZE); |
| } catch (StorageException e) { |
| log.warn("Unable to allocate ID block due to {}; retrying...", |
| e.getMessage()); |
| exc = e; |
| delay(RETRY_DELAY_MS); // FIXME: This is a deliberate hack; fix in Drake |
| } |
| } |
| throw new IllegalStateException("Unable to allocate ID block", exc); |
| } |
| |
| } |