org.apache.pulsar.functions.instance.SinkSchemaInfoProvider 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.pulsar.functions.instance;
import java.nio.ByteBuffer;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicLong;
import org.apache.pulsar.client.api.Schema;
import org.apache.pulsar.client.api.schema.SchemaInfoProvider;
import org.apache.pulsar.common.protocol.schema.BytesSchemaVersion;
import org.apache.pulsar.common.protocol.schema.SchemaHash;
import org.apache.pulsar.common.protocol.schema.SchemaVersion;
import org.apache.pulsar.common.schema.SchemaInfo;
/**
* SchemaInfo provider that creates a new schema version for each new schema hash.
*/
class SinkSchemaInfoProvider implements SchemaInfoProvider {
AtomicLong latestVersion = new AtomicLong(0);
ConcurrentHashMap schemaInfos = new ConcurrentHashMap<>();
ConcurrentHashMap schemaVersions = new ConcurrentHashMap<>();
/**
* Creates a new schema version with the info of the provided schema if the hash of the schema is a new one.
*
* @param schema schema for which we create a version
* @return the version of the schema
*/
public SchemaVersion addSchemaIfNeeded(Schema schema) {
SchemaHash schemaHash = SchemaHash.of(schema);
return schemaVersions.computeIfAbsent(schemaHash, s -> createNewSchemaInfo(schema.getSchemaInfo()));
}
private SchemaVersion createNewSchemaInfo(SchemaInfo schemaInfo) {
long l = latestVersion.incrementAndGet();
ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);
buffer.putLong(l);
BytesSchemaVersion schemaVersion = BytesSchemaVersion.of(buffer.array());
schemaInfos.put(schemaVersion, schemaInfo);
return schemaVersion;
}
@Override
public CompletableFuture getSchemaByVersion(byte[] schemaVersion) {
return CompletableFuture.completedFuture(schemaInfos.get(BytesSchemaVersion.of(schemaVersion)));
}
@Override
public CompletableFuture getLatestSchema() {
long l = latestVersion.get();
ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);
buffer.putLong(l);
SchemaVersion schemaVersion = BytesSchemaVersion.of(buffer.array());
return CompletableFuture.completedFuture(schemaInfos.get(schemaVersion));
}
@Override
public String getTopicName() {
return "__INTERNAL__";
}
}