package org.infinispan.atomic.impl;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Map;
import java.util.Set;
import org.infinispan.commons.marshall.AbstractExternalizer;
import org.infinispan.commons.util.Util;
import org.infinispan.marshall.core.Ids;
/**
* An atomic put operation.
* <p/>
*
* @author (various)
* @param <K>
* @param <V>
* @since 4.0
*/
public class PutOperation<K, V> extends Operation<K, V> {
private K key;
private V oldValue;
private V newValue;
public PutOperation() {
}
PutOperation(K key, V oldValue, V newValue) {
this.key = key;
this.oldValue = oldValue;
this.newValue = newValue;
}
@Override
public void rollback(Map<K, V> delegate) {
if (oldValue == null)
delegate.remove(key);
else
delegate.put(key, oldValue);
}
@Override
public void replay(Map<K, V> delegate) {
delegate.put(key, newValue);
}
@Override
public K keyAffected() {
return key;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof PutOperation)) return false;
PutOperation that = (PutOperation) o;
if (key != null ? !key.equals(that.key) : that.key != null) return false;
if (newValue != null ? !newValue.equals(that.newValue) : that.newValue != null) return false;
if (oldValue != null ? !oldValue.equals(that.oldValue) : that.oldValue != null) return false;
return true;
}
@Override
public int hashCode() {
int result = key != null ? key.hashCode() : 0;
result = 31 * result + (oldValue != null ? oldValue.hashCode() : 0);
result = 31 * result + (newValue != null ? newValue.hashCode() : 0);
return result;
}
@Override
public String toString() {
return "PutOperation{" +
"key=" + key +
", oldValue=" + oldValue +
", newValue=" + newValue +
'}';
}
public static class Externalizer extends AbstractExternalizer<PutOperation> {
@Override
public void writeObject(ObjectOutput output, PutOperation put) throws IOException {
output.writeObject(put.key);
output.writeObject(put.newValue);
}
@Override
public PutOperation readObject(ObjectInput input) throws IOException, ClassNotFoundException {
PutOperation<Object, Object> put = new PutOperation<Object, Object>();
put.key = input.readObject();
put.newValue = input.readObject();
return put;
}
@Override
public Integer getId() {
return Ids.ATOMIC_PUT_OPERATION;
}
@Override
public Set<Class<? extends PutOperation>> getTypeClasses() {
return Util.<Class<? extends PutOperation>>asSet(PutOperation.class);
}
}
}