org.apache.kafka.server.policy.AlterConfigPolicy 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,
* 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.apache.kafka.server.policy;
import org.apache.kafka.common.Configurable;
import org.apache.kafka.common.config.ConfigResource;
import org.apache.kafka.common.errors.PolicyViolationException;
import java.util.Map;
import java.util.Objects;
/**
* An interface for enforcing a policy on alter configs requests.
*
*
Common use cases are requiring that the replication factor, min.insync.replicas and/or retention settings for a
* topic remain within an allowable range.
*
*
If alter.config.policy.class.name is defined, Kafka will create an instance of the specified class
* using the default constructor and will then pass the broker configs to its configure() method. During
* broker shutdown, the close() method will be invoked so that resources can be released (if necessary).
*/
public interface AlterConfigPolicy extends Configurable, AutoCloseable {
/**
* Class containing the create request parameters.
*/
class RequestMetadata {
private final ConfigResource resource;
private final Map configs;
/**
* Create an instance of this class with the provided parameters.
*
* This constructor is public to make testing of AlterConfigPolicy implementations easier.
*/
public RequestMetadata(ConfigResource resource, Map configs) {
this.resource = resource;
this.configs = configs;
}
/**
* Return the configs in the request.
*/
public Map configs() {
return configs;
}
public ConfigResource resource() {
return resource;
}
@Override
public int hashCode() {
return Objects.hash(resource, configs);
}
@Override
public boolean equals(Object o) {
if ((o == null) || (!o.getClass().equals(getClass()))) return false;
RequestMetadata other = (RequestMetadata) o;
return resource.equals(other.resource) &&
configs.equals(other.configs);
}
@Override
public String toString() {
return "AlterConfigPolicy.RequestMetadata(resource=" + resource +
", configs=" + configs + ")";
}
}
/**
* Validate the request parameters and throw a PolicyViolationException with a suitable error
* message if the alter configs request parameters for the provided resource do not satisfy this policy.
*
* Clients will receive the POLICY_VIOLATION error code along with the exception's message. Note that validation
* failure only affects the relevant resource, other resources in the request will still be processed.
*
* @param requestMetadata the alter configs request parameters for the provided resource (topic is the only resource
* type whose configs can be updated currently).
* @throws PolicyViolationException if the request parameters do not satisfy this policy.
*/
void validate(RequestMetadata requestMetadata) throws PolicyViolationException;
}