org.springframework.boot.jdbc.metadata.CompositeDataSourcePoolMetadataProvider.java Source code

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Here is the source code for org.springframework.boot.jdbc.metadata.CompositeDataSourcePoolMetadataProvider.java

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/*
 * 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;
    }

}