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https://issues.apache.org/jira/browse/FLINK-5886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16048974#comment-16048974
]
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}}
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