org.apache.avro.message.SchemaStore Maven / Gradle / Ivy
/*
* 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
*
* 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.apache.avro.message;
import org.apache.avro.Schema;
import org.apache.avro.SchemaNormalization;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* Interface for classes that can provide avro schemas by fingerprint.
*/
public interface SchemaStore {
/**
* Retrieves a fingerprint by its AVRO-CRC-64 fingerprint.
*
* @param fingerprint an AVRO-CRC-64 fingerprint long
* @return a Schema with the given fingerprint, or null
*/
Schema findByFingerprint(long fingerprint);
/**
* A map-based cache of schemas by AVRO-CRC-64 fingerprint.
*
* This class is thread-safe.
*/
class Cache implements SchemaStore {
private final Map schemas = new ConcurrentHashMap<>();
/**
* Adds a schema to this cache that can be retrieved using its AVRO-CRC-64
* fingerprint.
*
* @param schema a {@link Schema}
*/
public void addSchema(Schema schema) {
long fp = SchemaNormalization.parsingFingerprint64(schema);
schemas.put(fp, schema);
}
@Override
public Schema findByFingerprint(long fingerprint) {
return schemas.get(fingerprint);
}
}
}