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}