spring CompositeDataSourcePoolMetadataProvider 源码
springboot CompositeDataSourcePoolMetadataProvider 代码
文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jdbc/metadata/CompositeDataSourcePoolMetadataProvider.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 java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import javax.sql.DataSource;
/**
* A {@link DataSourcePoolMetadataProvider} implementation that returns the first
* {@link DataSourcePoolMetadata} that is found by one of its delegate.
*
* @author Stephane Nicoll
* @since 2.0.0
*/
public class CompositeDataSourcePoolMetadataProvider implements DataSourcePoolMetadataProvider {
private final List<DataSourcePoolMetadataProvider> providers;
/**
* Create a {@link CompositeDataSourcePoolMetadataProvider} instance with an initial
* collection of delegates to use.
* @param providers the data source pool metadata providers
*/
public CompositeDataSourcePoolMetadataProvider(Collection<? extends DataSourcePoolMetadataProvider> providers) {
this.providers = (providers != null) ? Collections.unmodifiableList(new ArrayList<>(providers))
: Collections.emptyList();
}
@Override
public DataSourcePoolMetadata getDataSourcePoolMetadata(DataSource dataSource) {
for (DataSourcePoolMetadataProvider provider : this.providers) {
DataSourcePoolMetadata metadata = provider.getDataSourcePoolMetadata(dataSource);
if (metadata != null) {
return metadata;
}
}
return null;
}
}
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