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Python scripts could be invoked from Java using different frameworks. We have done analysis on the below frameworks and finally selected JEP-Java Embedded PythonProcess Builder framework and HTTP server for the final design and implementation. All the analysis findings of different frameworks are as follows.
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JArray.of
converts a Python NumPy array to Java. Python programmers expect that memory backed objects can be converted into bytes for rapid transfer using a memory view, thus memoryview(array)
will perform that task.Py4J is a library that enables Python programs to dynamically access Java objects in a Java Virtual Machine (JVM). It allows Python code to interact with Java code and vice versa, making it useful for integrating Python and Java programs. Py4J includes a gateway that connects the Python and Java programs, and allows for the exchange of data and calls between the two languages.
Py4J uses sockets to communicate between the Java and Python programs. When a Py4J gateway is created, it starts a server socket that listens for incoming connections from the Python program. The Python program can then connect to this socket and send commands to the Java program via the socket connection.
The Java program, in turn, sends the results of these commands back to the Python program via the same socket connection. This allows for a two-way communication between the Java and Python programs.
Py4J uses the socket connection to pass data and method calls between the two languages, and it takes care of the details of serializing and deserializing the data, so that the two programs can understand each other.
Since it uses sockets to communicate parallel execution in same vm will be difficult