action.yml

name: "Setup CI caches"
description: "Set up the JDK and cache Maven dependencies; reactor jobs also restore the generated-client build cache."
inputs:
  cache-type:
    description: "application-server-reactor for jobs that run the Maven reactor; application-server-tests for jobs that run goals against the packaged reactor"
    required: true
  os:
    description: "Operating system for cache key"
    required: false
    default: "ubuntu-latest"

runs:
  using: "composite"
  steps:
    - name: Validate cache type
      shell: bash
      env:
        CACHE_TYPE: ${{ inputs.cache-type }}
      run: |
        case "$CACHE_TYPE" in
          application-server-reactor|application-server-tests) ;;
          *) echo "::error::Unknown cache type '$CACHE_TYPE'."; exit 1 ;;
        esac

    - name: Compute generated-client cache identity
      id: generated-clients-identity
      if: inputs.cache-type == 'application-server-reactor'
      shell: bash
      env:
        DEPENDENCY_HASH: ${{ hashFiles('server/pom.xml', 'server/generated-clients/pom.xml', 'server/.mvn/**', 'server/generated-clients/src/**') }}
      run: |
        if [[ -z "$DEPENDENCY_HASH" ]]; then
          echo "::error::Cannot compute the generated-client cache identity from the checked-out repository."
          exit 1
        fi
        echo "hash=$DEPENDENCY_HASH" >> "$GITHUB_OUTPUT"

    - name: Set up JDK 21
      id: java
      uses: actions/setup-java@dd06d9cba3e5552c54d9f8ea23572deb30010f7c # v6.0.0
      with:
        distribution: "temurin"
        java-version: "21"
        cache: "maven"
        cache-dependency-path: |
          server/**/pom.xml
          server/.mvn/extensions.xml
          server/.mvn/wrapper/maven-wrapper.properties
        cache-read-only: ${{ github.ref != format('refs/heads/{0}', github.event.repository.default_branch) || !contains(fromJSON('["push", "schedule", "workflow_dispatch"]'), github.event_name) }}
        cache-jdk: false

    # Merge groups branch from main and read its caches like a pull request does.
    - name: Restore generated clients
      if: inputs.cache-type == 'application-server-reactor' && contains(fromJSON('["pull_request", "merge_group"]'), github.event_name)
      uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
      with:
        path: ~/.m2/build-cache
        key: ${{ inputs.os }}-${{ steps.java.outputs.distribution }}-${{ steps.java.outputs.version }}-generated-clients-${{ steps.generated-clients-identity.outputs.hash }}

    - name: Cache generated clients
      if: inputs.cache-type == 'application-server-reactor' && github.ref == format('refs/heads/{0}', github.event.repository.default_branch) && contains(fromJSON('["push", "schedule", "workflow_dispatch"]'), github.event_name)
      uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
      with:
        path: ~/.m2/build-cache
        key: ${{ inputs.os }}-${{ steps.java.outputs.distribution }}-${{ steps.java.outputs.version }}-generated-clients-${{ steps.generated-clients-identity.outputs.hash }}