File watcher that sends messages to Amazon SQS

Functionality

This application watches a directory for changes. Newly added files will be read and send to an SQS-queue. After successful sending the file will be deleted.

Getting the configuration for supporting the necessary reflection

on Graal VM

As described here, use the following to capture all the reflection magic that is being used in the application:

java -agentlib:native-image-agent=config-output-dir=native-config -jar build/libs/filewatch-2-sqs-1.0-SNAPSHOT-all.jar

This will capture all configuration detected in the directory native-config. This configuration (jni-config.json, proxy-config.json, reflect-config.json and resource-config.json) is already stored in src/main/resources/ under META-INF/native-image.

Configuration and creation of the Graal native image with Gradle

Execute ./gradlew nativeImage.

Configuration and creation of the Graal native image with scripts

Next to the configuration mentioned above, thenative-image.properties configures how the native-image will be compiled.

Make sure that the native-image of the Graal VM is on the Path.

export JAVA_HOME=$(/usr/libexec/java_home -v 1.8)
export PATH=$JAVA_HOME/bin:$PATH

The build.sh contains building the jar file (with gradle) and the creation of the native image

Running the sample

Environment variables

The application uses two environment variables to transfer newly created files.

These are:

SQS_QUEUE
SQS_INPUT_DIRECTORY

Amazon SQS

Make sure that the correct credentials for AWS are available. Make sure that the SQS queue is defined in the Amazon Console.

Running the application

Next to the environment variables, you also need to provide a trust store, as the default trust store of Graal VM does not contain the correct certificates.

So the following

export SQS_QUEUE=https://sqs.***.amazonaws.com/****/*** && \
  export SQS_INPUT_DIRECTORY=/watch/directory && \
   ./filewatch-2-sqs -Djavax.net.ssl.trustStore=./cacerts

martijnblankestijn / filewatch-2-sqs