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Multiple Binary Input Example

Overview

The goal of this example project is to test the performance of Engflow's remote execution and caching service based on the number of input binary files in the dependency graph. The project contains a genrule that generates a specified number of Java binaries for the genbinary Java library, which are then listed as dependencies in the main binary. The Main.java file loops through each generated class and calls its greetNum method.

Project Structure

  • java/com/engflow/internship/binaryinput/Main.java: Main class that dynamically loads and invokes methods from generated classes.
  • java/com/engflow/internship/binaryinput/BUILD: Bazel build file for the main java binary and the genbinary library.

Usage

To generate the test files, build the genbinary library using the genrule:

bazel build //java/com/engflow/internship/binaryinput:genbinary

Then, the program can be run with the following command:

bazel run //java/com/engflow/internship/binaryinput:main

How It Works

  1. Generation of Java Binaries:

    • The genrule in the BUILD file generates a specified number of Java classes (Hello1.java, Hello2.java, ..., HelloN.java).
    • Each generated class contains a greetNum method that prints a unique message.

  2. Main Class Execution:

    • The Main.java file in binaryinput dynamically loads each generated class using reflection.
    • It then invokes the greetNum method of each class, printing the corresponding message.

Configuration

The number of generated files is controlled by the NUM_FILES variable in the BUILD file of the binaryinput package. Modify this variable to change the number of generated classes and observe the performance impact on Engflow's remote execution and caching service.

Example

To generate and run the program with 10 input binary files:

  1. Set NUM_FILES to 10 in java/com/engflow/internship/binaryinput/BUILD.
  2. Build the genbinary library: 
    bazel build //java/com/engflow/internship/binaryinput:genbinary
  3. Run the main binary: 
    bazel run //java/com/engflow/internship/binaryinput:main

This will generate 10 Java classes, build the genbinary library, and run the main binary, which will print messages from each generated class.