| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.ignite.internal.processors.query.stat; |
| |
| import java.io.Externalizable; |
| import java.io.IOException; |
| import java.io.ObjectInput; |
| import java.io.ObjectOutput; |
| import org.apache.ignite.internal.processors.query.stat.hll.HLL; |
| |
| /** |
| * Partition obsolescence tracker. |
| */ |
| public class ObjectPartitionStatisticsObsolescence implements Externalizable { |
| /** */ |
| private static final long serialVersionUID = 0L; |
| |
| /** HLL to track modified keys. */ |
| private HLL modified; |
| |
| /** Dirty flag, {@code true} if there are not saved on disc changes. */ |
| private transient volatile boolean dirty; |
| |
| /** |
| * Constructor. |
| */ |
| public ObjectPartitionStatisticsObsolescence() { |
| modified = new HLL(13, 5); |
| } |
| |
| /** |
| * @param key Save specified key in modified keys counter. |
| */ |
| public synchronized void onModified(byte[] key) { |
| Hasher h = new Hasher(); |
| |
| modified.addRaw(h.fastHash(key)); |
| |
| dirty = true; |
| } |
| |
| /** |
| * @return The estimated number of modified keys. |
| */ |
| public synchronized long modified() { |
| return modified.cardinality(); |
| } |
| |
| /** |
| * @return {@code true} if object has unsaved changes, {@code false} - otherwise. |
| */ |
| public boolean dirty() { |
| return dirty; |
| } |
| |
| /** |
| * Set dirty flag. |
| * |
| * @param dirty The new dirty flag value. |
| */ |
| public void dirty(boolean dirty) { |
| this.dirty = dirty; |
| } |
| |
| |
| /** {@inheritDoc} */ |
| @Override public void writeExternal(ObjectOutput out) throws IOException { |
| byte[] rawData = modified.toBytes(); |
| |
| out.writeInt(rawData.length); |
| out.write(rawData); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException { |
| int length = in.readInt(); |
| byte[] rawData = new byte[length]; |
| in.read(rawData); |
| modified = HLL.fromBytes(rawData); |
| } |
| } |