spring DataSourcePoolMetadata 源码
springboot DataSourcePoolMetadata 代码
文件路径:/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jdbc/metadata/DataSourcePoolMetadata.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;
/**
* Provides access meta-data that is commonly available from most pooled
* {@link DataSource} implementations.
*
* @author Stephane Nicoll
* @author Artsiom Yudovin
* @since 2.0.0
*/
public interface DataSourcePoolMetadata {
/**
* Return the usage of the pool as value between 0 and 1 (or -1 if the pool is not
* limited).
* <ul>
* <li>1 means that the maximum number of connections have been allocated</li>
* <li>0 means that no connection is currently active</li>
* <li>-1 means there is not limit to the number of connections that can be allocated
* </li>
* </ul>
* This may also return {@code null} if the data source does not provide the necessary
* information to compute the poll usage.
* @return the usage value or {@code null}
*/
Float getUsage();
/**
* Return the current number of active connections that have been allocated from the
* data source or {@code null} if that information is not available.
* @return the number of active connections or {@code null}
*/
Integer getActive();
/**
* Return the number of established but idle connections. Can also return {@code null}
* if that information is not available.
* @return the number of established but idle connections or {@code null}
* @since 2.2.0
* @see #getActive()
*/
default Integer getIdle() {
return null;
}
/**
* Return the maximum number of active connections that can be allocated at the same
* time or {@code -1} if there is no limit. Can also return {@code null} if that
* information is not available.
* @return the maximum number of active connections or {@code null}
*/
Integer getMax();
/**
* Return the minimum number of idle connections in the pool or {@code null} if that
* information is not available.
* @return the minimum number of active connections or {@code null}
*/
Integer getMin();
/**
* Return the query to use to validate that a connection is valid or {@code null} if
* that information is not available.
* @return the validation query or {@code null}
*/
String getValidationQuery();
/**
* The default auto-commit state of connections created by this pool. If not set
* ({@code null}), default is JDBC driver default (If set to null then the
* java.sql.Connection.setAutoCommit(boolean) method will not be called.)
* @return the default auto-commit state or {@code null}
*/
Boolean getDefaultAutoCommit();
}
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