| /* |
| * 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.metric; |
| |
| /** |
| * No Operation IO statistics holder. Use in case statistics shouldn't be gathered. |
| */ |
| public class IoStatisticsHolderNoOp implements IoStatisticsHolder { |
| /** No-op statistics. */ |
| public static final IoStatisticsHolderNoOp INSTANCE = new IoStatisticsHolderNoOp(); |
| |
| /** |
| * Private constructor. |
| */ |
| private IoStatisticsHolderNoOp() { |
| // No-op. |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public void trackLogicalRead(long pageAddr) { |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public void trackPhysicalAndLogicalRead(long pageAddr) { |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public long logicalReads() { |
| return 0; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public long physicalReads() { |
| return 0; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public String metricRegistryName() { |
| return null; |
| } |
| } |