spring AbstractDataSourcePoolMetadata 源码
springboot AbstractDataSourcePoolMetadata 代码
文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jdbc/metadata/AbstractDataSourcePoolMetadata.java
/*
* Copyright 2012-2019 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.boot.jdbc.metadata;
import javax.sql.DataSource;
/**
* A base {@link DataSourcePoolMetadata} implementation.
*
* @param <T> the data source type
* @author Stephane Nicoll
* @since 2.0.0
*/
public abstract class AbstractDataSourcePoolMetadata<T extends DataSource> implements DataSourcePoolMetadata {
private final T dataSource;
/**
* Create an instance with the data source to use.
* @param dataSource the data source
*/
protected AbstractDataSourcePoolMetadata(T dataSource) {
this.dataSource = dataSource;
}
@Override
public Float getUsage() {
Integer maxSize = getMax();
Integer currentSize = getActive();
if (maxSize == null || currentSize == null) {
return null;
}
if (maxSize < 0) {
return -1f;
}
if (currentSize == 0) {
return 0f;
}
return (float) currentSize / (float) maxSize;
}
protected final T getDataSource() {
return this.dataSource;
}
}
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