git-multi-file

cfg4j sample app (uses git as configuration store)

App demonstrating how to access configuration stored in a Git repository using cfg4j library. Uses multiple configuration files.

Usage

> cd cfg4j-sample-apps/
> ./gradlew build
> java -jar git-multi-file/build/libs/git-multi-file-1.0.0-SNAPSHOT.jar

You can:

• use any git repository: -DconfigRepoPath=<repositoryUrl> parameter. Both local and remote repos are supported.
• use non-default branch: -DconfigBranch=<branchName>

> java -DconfigRepoPath=/tmp/myRepo.git -DconfigBranch=master -jar git-multi-file/build/libs/git-multi-file-1.0.0-SNAPSHOT.jar

Code snippets

Configuration beans - see ConfigBeans.java

@Value("${configRepoPath:https://github.com/cfg4j/cfg4j-git-sample-config.git}")
private String configRepoPath; // Run with -DconfigRepoPath=<repositoryUrl> parameter to override

@Value("${configBranch:production-env}")
private String branch; // Run with -DconfigBranch=<branchName> parameter to override

@Bean
public ConfigurationProvider configurationProvider() {
  // Specify which files to load. Configuration from both files will be merged.
  ConfigFilesProvider configFilesProvider = () -> Arrays.asList(Paths.get("application.properties"), Paths.get("otherConfig.properties"));

  // Use Git repository as configuration store
  ConfigurationSource source = new GitConfigurationSourceBuilder()
      .withRepositoryURI(configRepoPath)
      .withConfigFilesProvider(configFilesProvider)
      .build();

  // Select branch to use (use new DefaultEnvironment()) for master
  Environment environment = new ImmutableEnvironment(branch);

  // Reload configuration every 5 seconds
  ReloadStrategy reloadStrategy = new PeriodicalReloadStrategy(5, TimeUnit.SECONDS);

  // Create provider
  return new ConfigurationProviderBuilder()
      .withConfigurationSource(source)
      .withEnvironment(environment)
      .withReloadStrategy(reloadStrategy)
      .build();
}

Obtain configuration - see MainController.java

// Define configuration interface 
public interface ReksioConfig {
  URL homepage();
  ...
}

ReksioConfig reksioConfig = configurationProvider.bind("reksio", ReksioConfig.class);
URL url = reksioConfig.homepage();