org.apache.flink.streaming.connectors.pulsar.internal.JsonSer Maven / Gradle / Ivy
/*
* 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 org.apache.flink.streaming.connectors.pulsar.internal;
import org.apache.flink.api.common.serialization.SerializationSchema;
import org.apache.flink.util.Preconditions;
import org.apache.pulsar.client.impl.schema.JSONSchema;
/**
* Read JSON encoded data from Pulsar.
* @param the type of record class.
*/
public class JsonSer implements SerializationSchema {
private final Class recordClazz;
private transient JSONSchema pulsarSchema;
private JsonSer(Class recordClazz) {
Preconditions.checkNotNull(recordClazz, "JSON record class must not be null");
this.recordClazz = recordClazz;
}
public static JsonSer of(Class recordClazz) {
return new JsonSer<>(recordClazz);
}
@Override
public byte[] serialize(T message) {
checkPulsarJsonSchemaInitialized();
return pulsarSchema.encode(message);
}
private void checkPulsarJsonSchemaInitialized() {
if (pulsarSchema != null) {
return;
}
this.pulsarSchema = JSONSchema.of(recordClazz);
}
}