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From zentol <...@git.apache.org>
Subject [GitHub] flink pull request #3838: [FLINK-5886] Python API for streaming applications
Date Wed, 14 Jun 2017 09:48:08 GMT
Github user zentol commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3838#discussion_r121900972
  
    --- Diff: flink-libraries/flink-streaming-python/src/main/java/org/apache/flink/streaming/python/util/serialization/PythonSerializationSchema.java
---
    @@ -0,0 +1,53 @@
    +/*
    + * 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.flink.streaming.python.util.serialization;
    +
    +import java.io.IOException;
    +
    +import org.apache.flink.streaming.util.serialization.SerializationSchema;
    +import org.python.core.PyObject;
    +
    +/**
    + * A Python serialization schema, which implements {@link SerializationSchema}. It converts
    + * a {@code PyObject} into its serialized form.
    + */
    +public class PythonSerializationSchema implements SerializationSchema<PyObject>
{
    +	private static final long serialVersionUID = -9170596504893036458L;
    +
    +	private final byte[] serSchema;
    +	private transient SerializationSchema<PyObject> schema;
    +
    +	public PythonSerializationSchema(SerializationSchema<PyObject> schema) throws
IOException {
    +		this.serSchema = SerializationUtils.serializeObject(schema);
    +	}
    +
    +	@Override
    +	@SuppressWarnings("unchecked")
    +	public byte[] serialize(PyObject element) {
    +		if (this.schema == null) {
    +			try {
    +				this.schema = (SerializationSchema<PyObject>)SerializationUtils.deserializeObject(this.serSchema);
    +			} catch (IOException e) {
    +				e.printStackTrace();
    --- End diff --
    
    we should fail right here, as otherwise we get an NPE later on anyway.


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