io.streamnative.pulsar.handlers.kop.schemaregistry.model.impl.SchemaIdAndSubjects Maven / Gradle / Ivy

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Kafka Compatible Schema Registry
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/**
 * Copyright (c) 2019 - 2024 StreamNative, Inc.. All Rights Reserved.
 */
/**
 * 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
 *
 *     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 io.streamnative.pulsar.handlers.kop.schemaregistry.model.impl;

import io.streamnative.pulsar.handlers.kop.schemaregistry.model.SchemaKey;
import java.util.Map;
import java.util.Set;
import java.util.function.Predicate;

/**
 * Kafka schema registry maintains a few in memory indices to facilitate schema lookups. One such
 * index is the md5 index that maps MD5 -> SchemaIdAndSubjects. This index is used to do 2 things.
 * Firstly, to prevent the same schema string from being registered multiple times. So, if the MD5
 * of the canonicalized schema is present in the registry, we simply return the id. However, the
 * same schema string can be registered under multiple subjects. And if so, it may be assigned
 * different version ids per subject that it registers under
 */
public class SchemaIdAndSubjects {

    private final int id;
    private final Map subjectsAndVersions;

    public SchemaIdAndSubjects(int id, Map subjectsAndVersions) {
        this.subjectsAndVersions = subjectsAndVersions;
        this.id = id;
    }

    public boolean hasSubject(String subject) {
        return this.subjectsAndVersions.keySet().contains(subject);
    }

    public int getVersion(String subject) {
        return this.subjectsAndVersions.get(subject);
    }

    public int getSchemaId() {
        return this.id;
    }

    public boolean isEmpty() {
        return subjectsAndVersions.isEmpty();
    }

    public SchemaKey findAny(Predicate filter) {
        return subjectsAndVersions.entrySet().stream()
                .map(e -> new SchemaKey(e.getKey(), e.getValue()))
                .filter(key -> filter.test(key))
                .findAny()
                .orElse(null);
    }

    public Set allSubjects() {
        return subjectsAndVersions.keySet();
    }

    public Map allSubjectVersions() {
        return subjectsAndVersions;
    }

    public void removeIf(Predicate filter) {
        subjectsAndVersions.entrySet().removeIf(e ->
                filter.test(new SchemaKey(e.getKey(), e.getValue())));
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        SchemaIdAndSubjects that = (SchemaIdAndSubjects) o;

        if (this.id != that.id) {
            return false;
        }
        if (!this.subjectsAndVersions.equals(that.subjectsAndVersions)) {
            return false;
        }

        return true;
    }

    @Override
    public int hashCode() {
        int result = 31 * this.id;
        result = 31 * result + subjectsAndVersions.hashCode();
        return result;
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("{id=" + this.id + ",");
        sb.append("subjectsAndVersions=" + this.subjectsAndVersions.toString() + "}");
        return sb.toString();
    }

}