forked from voldemort/voldemort
/
InMemoryPutAssertionStorageEngine.java
69 lines (58 loc) · 2.49 KB
/
InMemoryPutAssertionStorageEngine.java
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package voldemort.store.memory;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import org.apache.log4j.Logger;
import voldemort.VoldemortException;
import voldemort.store.StoreUtils;
import voldemort.versioning.Versioned;
public class InMemoryPutAssertionStorageEngine<K, V, T> extends InMemoryStorageEngine<K, V, T> {
private static final Logger logger = Logger.getLogger(InMemoryPutAssertionStorageEngine.class);
private final ConcurrentMap<K, Boolean> assertionMap;
public InMemoryPutAssertionStorageEngine(String name) {
super(name);
this.assertionMap = new ConcurrentHashMap<K, Boolean>();
}
public synchronized void assertPut(K key) throws VoldemortException {
StoreUtils.assertValidKey(key);
// delete if exist
List<Versioned<V>> result = super.getInnerMap().remove(key);
if(result == null || result.size() == 0) {
// if non-exist, record as assertion
assertionMap.put(key, true); // use synchronized to avoid race
// condition here
if(logger.isDebugEnabled()) {
logger.debug("PUT Assertion added (not yet fulfilled) for key: " + key
+ " assertionMap size: " + assertionMap.size());
}
} else {
if(logger.isTraceEnabled()) {
logger.trace("PUT Assertion added (immediately fulfilled) for key: " + key
+ " assertionMap size: " + assertionMap.size());
}
}
}
@Override
public synchronized void put(K key, Versioned<V> value, T transforms) throws VoldemortException {
// try to delete from assertion
// do real put if has not been asserted
Boolean result = assertionMap.remove(key);
if(result == null) {
super.put(key, value, transforms);
if(logger.isTraceEnabled()) {
logger.trace("PUT key: " + key + " (never asserted) assertionMap size: "
+ assertionMap.size());
}
} else {
if(logger.isDebugEnabled()) {
logger.debug("PUT key: " + key
+ " (found and fulfills put assertion) assertionMap size: "
+ assertionMap.size());
}
}
}
public Set<K> getFailedAssertions() {
return assertionMap.keySet();
}
}