package org.infinispan.counter.impl.function;
import static org.infinispan.counter.impl.entries.CounterValue.newCounterValue;
import java.io.IOException;
import java.io.ObjectInput;
import java.util.Collections;
import java.util.Set;
import org.infinispan.commons.api.functional.EntryView;
import org.infinispan.commons.logging.LogFactory;
import org.infinispan.commons.marshall.AdvancedExternalizer;
import org.infinispan.commons.marshall.exts.NoStateExternalizer;
import org.infinispan.counter.impl.entries.CounterKey;
import org.infinispan.counter.impl.entries.CounterValue;
import org.infinispan.counter.impl.externalizers.ExternalizerIds;
import org.infinispan.counter.impl.metadata.ConfigurationMetadata;
import org.infinispan.counter.logging.Log;
import org.infinispan.util.ByteString;
/**
* Reset function that sets the counter's delta to it's initial delta.
*
* @author Pedro Ruivo
* @since 9.0
*/
public class ResetFunction<K extends CounterKey> extends BaseFunction<K, Void> {
public static final AdvancedExternalizer<ResetFunction> EXTERNALIZER = new Externalizer();
private static final Log log = LogFactory.getLog(ResetFunction.class, Log.class);
private static final ResetFunction INSTANCE = new ResetFunction();
private ResetFunction() {
}
public static <K extends CounterKey> ResetFunction<K> getInstance() {
//noinspection unchecked
return INSTANCE;
}
@Override
void logCounterNotFound(ByteString counterName) {
log.noSuchCounterReset(counterName);
}
@Override
Void apply(EntryView.ReadWriteEntryView<K, CounterValue> entryView, ConfigurationMetadata metadata) {
entryView.set(newCounterValue(metadata.get()), metadata);
return null;
}
@Override
protected Log getLog() {
return log;
}
@Override
public String toString() {
return "ResetFunction{}";
}
private static class Externalizer extends NoStateExternalizer<ResetFunction> {
@Override
public ResetFunction readObject(ObjectInput input) throws IOException, ClassNotFoundException {
return ResetFunction.getInstance();
}
@Override
public Set<Class<? extends ResetFunction>> getTypeClasses() {
return Collections.singleton(ResetFunction.class);
}
@Override
public Integer getId() {
return ExternalizerIds.RESET_FUNCTION;
}
}
}