https://github.com/joel-jeremy/externalized-properties

A lightweight and extensible library to resolve application properties from various external sources.
https://github.com/joel-jeremy/externalized-properties

configuration feature-flags feature-toggles java jvm properties

Last synced: 7 months ago
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A lightweight and extensible library to resolve application properties from various external sources.

Host: GitHub
URL: https://github.com/joel-jeremy/externalized-properties
Owner: joel-jeremy
License: apache-2.0
Created: 2021-10-29T19:04:28.000Z (about 4 years ago)
Default Branch: main
Last Pushed: 2024-08-23T01:49:13.000Z (about 1 year ago)
Last Synced: 2024-11-08T17:47:42.935Z (12 months ago)
Topics: configuration, feature-flags, feature-toggles, java, jvm, properties
Language: Java
Homepage:
Size: 1.46 MB
Stars: 27
Watchers: 3
Forks: 0
Open Issues: 10
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- Funding: .github/FUNDING.yml
- License: LICENSE

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README

          # Externalized Properties

[![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://github.com/joel-jeremy/externalized-properties/blob/main/LICENSE)

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A lightweight and extensible library to resolve application properties from various external sources.

## Like the project?

Please consider giving the repository a ⭐. It means a lot! Thank you :)

## [Twelve Factor Methodology](https://12factor.net)

Externalized Properties was inspired by the [The Twelve Factor Methodology](https://12factor.net)'s section [III. Config](https://12factor.net/config).  

The goal of this library is to make it easy for applications to implement configuration best practices by providing easy-to-use APIs as well as providing the flexibility to choose where to store their configurations/properties.

## 🛠️ Installation

### Gradle

```groovy

implementation "io.github.joel-jeremy.externalized-properties:externalized-properties-core:${version}"

// Optional/additional resolvers

implementation "io.github.joel-jeremy.externalized-properties:externalized-properties-database:${version}"

implementation "io.github.joel-jeremy.externalized-properties:externalized-properties-git:${version}"

```

### Maven

```xml

  io.github.joel-jeremy.externalized-properties

  externalized-properties-core

  ${version}

  io.github.joel-jeremy.externalized-properties

  externalized-properties-database

  ${version}

  io.github.joel-jeremy.externalized-properties

  externalized-properties-git

  ${version}

```

### 🧩 Java 9 Module Names

Externalized Properties jars are published with Automatic-Module-Name manifest attribute:

- Core - `io.github.joeljeremy.externalizedproperties.core`

- Database Resolver - `io.github.joeljeremy.externalizedproperties.database`

- Git Resolver - `io.github.joeljeremy.externalizedproperties.git`

Module authors can use above module names in their module-info.java:

```java

module foo.bar {

  requires io.github.joeljeremy.externalizedproperties.core;

  requires io.github.joeljeremy.externalizedproperties.database;

  requires io.github.joeljeremy.externalizedproperties.git;

}

```

## 🌟 Features

Externalized Properties takes full advantage of Java's [Dynamic Proxies](https://docs.oracle.com/javase/8/docs/technotes/guides/reflection/proxy.html) ([Why Dynamic Proxies?](docs/why-dynamic-proxies.md)).

### ✔️ Property Resolution

- [Map Properties to (Java Dynamic Proxy) Interface Methods](docs/property-resolution.md#-map-properties-to-java-dynamic-proxy-interface-methods)

- [Default/Fallback Values](docs/property-resolution.md#-defaultfallback-values)  

- [Support for Property Names Known at Runtime](docs/property-resolution.md#-support-for-property-names-known-at-runtime)

- [Support for Various Configuration File/Resource Formats](docs/property-resolution.md#-support-for-various-configuration-fileresource-formats)  

- [Caching](docs/property-resolution.md#-caching)  

- [Eager Loading](docs/property-resolution.md#-eager-loading)  

- [Custom Resolvers](docs/property-resolution.md#-custom-resolvers)  

### ✔️ Conversion

- [Automatic Property Conversion](docs/conversion.md#-automatic-property-conversion)  

- [Conversion to Generic Types](docs/conversion.md#-conversion-to-generic-types)  

- [Conversion of Arbitrary Values](docs/conversion.md#-conversion-of-arbitrary-values)

- [Custom Converters](docs/conversion.md#-custom-converters)

### ✔️ Variable Expansion

- [Automatic Variable Expansion in Property Names](docs/variable-expansion.md#-automatic-variable-expansion-in-property-names)  

- [Automatic Variable Expansion in Properties](docs/variable-expansion.md#-automatic-variable-expansion-in-properties)  

- [Variable Expansion in Arbitrary Values](docs/variable-expansion.md#-variable-expansion-in-arbitrary-values)

### ✔️ Processing

- [Targeted Processing of Properties](docs/processing.md#-targeted-processing-of-properties)

- [Custom Processors](docs/processing.md#-custom-processors)

### ✔️ Profiles

- [Profile-Specific Configurations](docs/profiles.md#-profile-specific-configurations)

### ✔️ Ordinal Components

- [Ordinal Resolvers](docs/ordinal-components.md#-ordinal-resolvers)  

- [Ordinal Converters](docs/ordinal-components.md#-ordinal-converters)

## 🏎️ Quick Start

Properties are mapped to proxy interface methods by using the [@ExternalizedProperty](core/src/main/java/io/github/joeljeremy/externalizedproperties/core/ExternalizedProperty.java) annotation.

(For more advanced scenarios, please see the feature documentations.)

Given an interface:

```java

public interface ApplicationProperties {

  @ExternalizedProperty("java.home")

  String javaHome();

  @ExternalizedProperty("encrypted.property")

  @Decrypt("MyDecryptor")

  String encryptedProperty();

  @ExternalizedProperty("java.version")

  int javaVersion();

}

```

We can initialize and start resolving external configurations/properties by:

```java

public static void main(String[] args) {

  // 1. Configure and build the ExternalizedProperties instance.

  ExternalizedProperties externalizedProperties = buildExternalizedProperties();

  // 2. Initialize a proxy using the ExternalizedProperties.

  ApplicationProperties props = externalizedProperties.initialize(ApplicationProperties.class);

  // 3. Resolve the properties.

  String javaHome = props.javaHome();

  String encryptedProperty = props.encryptedProperty();

  int javaVersion = props.javaVersion();

}

private static ExternalizedProperties buildExternalizedProperties() {

  return ExternalizedProperties.builder()

      .defaults() 

      .resolvers(...)

      .processors(...)

      .converters(...) 

      .build();

}

```

## 🧪 Samples

More sample can be found here:

ecosyste.ms

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https://github.com/joel-jeremy/externalized-properties

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