flink-formats-kafka/flink-avro-confluent-registry/src/main/java/org/apache/flink/formats/avro/registry/confluent/CachedSchemaCoderProvider.java

/*
 * 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.flink.formats.avro.registry.confluent;

import org.apache.flink.annotation.Internal;
import org.apache.flink.formats.avro.SchemaCoder;

import io.confluent.kafka.schemaregistry.client.CachedSchemaRegistryClient;

import javax.annotation.Nullable;

import java.util.Map;
import java.util.Objects;

/**
 * A {@link SchemaCoder.SchemaCoderProvider} that uses a cached schema registry client underneath.
 */
@Internal
class CachedSchemaCoderProvider implements SchemaCoder.SchemaCoderProvider {

    private static final long serialVersionUID = 8610401613495438381L;
    private final String subject;
    private final String url;
    private final int identityMapCapacity;
    private final @Nullable Map<String, ?> registryConfigs;

    CachedSchemaCoderProvider(String url, int identityMapCapacity) {
        this(null, url, identityMapCapacity, null);
    }

    CachedSchemaCoderProvider(
            @Nullable String subject,
            String url,
            int identityMapCapacity,
            @Nullable Map<String, ?> registryConfigs) {
        this.subject = subject;
        this.url = Objects.requireNonNull(url);
        this.identityMapCapacity = identityMapCapacity;
        this.registryConfigs = registryConfigs;
    }

    @Override
    public SchemaCoder get() {
        return new ConfluentSchemaRegistryCoder(
                this.subject,
                new CachedSchemaRegistryClient(url, identityMapCapacity, registryConfigs));
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        CachedSchemaCoderProvider that = (CachedSchemaCoderProvider) o;
        return identityMapCapacity == that.identityMapCapacity
                && Objects.equals(subject, that.subject)
                && url.equals(that.url)
                && Objects.equals(registryConfigs, that.registryConfigs);
    }

    @Override
    public int hashCode() {
        return Objects.hash(subject, url, identityMapCapacity, registryConfigs);
    }
}