org.apache.hudi.common.config.SerializableSchema 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 "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.hudi.common.config;
import org.apache.avro.Schema;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
/**
* A wrapped Schema which can be serialized.
*/
public class SerializableSchema implements Serializable {
private transient Schema schema;
public SerializableSchema() {
}
public SerializableSchema(Schema schema) {
this.schema = newCopy(schema);
}
public SerializableSchema(SerializableSchema serializableSchema) {
this(serializableSchema.schema);
}
public static Schema newCopy(Schema schemaObject) {
return new Schema.Parser().parse(schemaObject.toString());
}
public Schema get() {
return schema;
}
private void writeObject(ObjectOutputStream out) throws IOException {
out.defaultWriteObject();
writeObjectTo(out);
}
private void readObject(ObjectInputStream in) throws IOException {
readObjectFrom(in);
}
// create a public write method for unit test
public void writeObjectTo(ObjectOutputStream out) throws IOException {
// Note: writeUTF cannot support string length > 64K. So use writeObject which has small overhead (relatively).
out.writeObject(schema.toString());
}
// create a public read method for unit test
public void readObjectFrom(ObjectInputStream in) throws IOException {
try {
schema = new Schema.Parser().parse(in.readObject().toString());
} catch (ClassNotFoundException e) {
throw new IOException("unable to parse schema", e);
}
}
@Override
public String toString() {
return schema.toString();
}
}