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ASF GitHub Bot commented on FLINK-5886: --------------------------------------- Github user zentol commented on a diff in the pull request: https://github.com/apache/flink/pull/3838#discussion_r121901070 --- Diff: flink-libraries/flink-streaming-python/src/main/java/org/apache/flink/streaming/python/util/serialization/PythonDeserializationSchema.java --- @@ -0,0 +1,62 @@ +/* + * 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 org.apache.flink.api.common.typeinfo.TypeHint; +import org.apache.flink.api.common.typeinfo.TypeInformation; +import org.apache.flink.streaming.util.serialization.DeserializationSchema; + +import java.io.IOException; + +/** + * A Python deserialization schema, which implements {@link DeserializationSchema}. It converts a + * serialized form of {@code PyObject} into its Java Object representation. + */ +public class PythonDeserializationSchema implements DeserializationSchema<Object> { + private static final long serialVersionUID = -9180596504893036458L; + private final TypeInformation<Object> resultType = TypeInformation.of(new TypeHint<Object>(){}); + + private final byte[] serSchema; + private transient DeserializationSchema<Object> schema; + + public PythonDeserializationSchema(DeserializationSchema<Object> schema) throws IOException { + this.serSchema = SerializationUtils.serializeObject(schema); + } + + @SuppressWarnings("unchecked") + public Object deserialize(byte[] message) throws IOException { + if (this.schema == null) { + try { + this.schema = (DeserializationSchema<Object>) SerializationUtils.deserializeObject(this.serSchema); + } catch (ClassNotFoundException e) { + e.printStackTrace(); --- End diff -- we should fail right here as otherwise he get an NPE later on. > Python API for streaming applications > ------------------------------------- > > Key: FLINK-5886 > URL: https://issues.apache.org/jira/browse/FLINK-5886 > Project: Flink > Issue Type: New Feature > Components: Python API > Reporter: Zohar Mizrahi > Assignee: Zohar Mizrahi > > A work in progress to provide python interface for Flink streaming APIs. The > core technology is based on jython and thus imposes two limitations: a. user > defined functions cannot use python extensions. b. the python version is 2.x > The branch is based on Flink release 1.2.0, as can be found here: > https://github.com/zohar-pm/flink/tree/python-streaming > In order to test it, someone can use IntelliJ IDE. Assuming IntelliJ was > setup properly (see: > https://ci.apache.org/projects/flink/flink-docs-release-1.3/internals/ide_setup.html), > one can run/debug {{org.apache.flink.python.api.PythonStreamBinderTest}}, > which in return will execute all the tests under > {{/Users/zohar/dev/pm-flink/flink-libraries/flink-python/src/test/python/org/apache/flink/python/api/streaming}} -- This message was sent by Atlassian JIRA (v6.4.14#64029)