com.datastax.oss.driver.internal.core.metadata.MetadataRefresh Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
*
* http://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,
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* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.datastax.oss.driver.internal.core.metadata;
import com.datastax.oss.driver.api.core.session.Session;
import com.datastax.oss.driver.internal.core.context.InternalDriverContext;
import java.util.Collections;
import java.util.List;
/**
* Any update to the driver's metadata. It produces a new metadata instance, and may also trigger
* events.
*
* This is modelled as a separate type for modularity, and because we can't send the events while
* we are doing the refresh (by contract, the new copy of the metadata needs to be visible before
* the events are sent). This also makes unit testing very easy.
*
*
This is only instantiated and called from {@link MetadataManager}'s admin thread, therefore
* implementations don't need to be thread-safe.
*
* @see Session#getMetadata()
*/
public interface MetadataRefresh {
Result compute(
DefaultMetadata oldMetadata, boolean tokenMapEnabled, InternalDriverContext context);
class Result {
public final DefaultMetadata newMetadata;
public final List