001/* 002 * Copyright 2012-2017 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.boot.jdbc.metadata; 018 019import javax.sql.DataSource; 020 021/** 022 * A base {@link DataSourcePoolMetadata} implementation. 023 * 024 * @param <T> the data source type 025 * @author Stephane Nicoll 026 * @since 2.0.0 027 */ 028public abstract class AbstractDataSourcePoolMetadata<T extends DataSource> 029 implements DataSourcePoolMetadata { 030 031 private final T dataSource; 032 033 /** 034 * Create an instance with the data source to use. 035 * @param dataSource the data source 036 */ 037 protected AbstractDataSourcePoolMetadata(T dataSource) { 038 this.dataSource = dataSource; 039 } 040 041 @Override 042 public Float getUsage() { 043 Integer maxSize = getMax(); 044 Integer currentSize = getActive(); 045 if (maxSize == null || currentSize == null) { 046 return null; 047 } 048 if (maxSize < 0) { 049 return -1F; 050 } 051 if (currentSize == 0) { 052 return 0F; 053 } 054 return (float) currentSize / (float) maxSize; 055 } 056 057 protected final T getDataSource() { 058 return this.dataSource; 059 } 060 061}