Commons

Common utility methods and classes.

Usage

Add Dependency

Determine the latest version of the commons in Maven Central.

Maven

Add a dependency to your pom:

<dependency>
    <groupId>com.arpnetworking.commons</groupId>
    <artifactId>commons</artifactId>
    <version>VERSION</version>
</dependency>

The Maven Central repository is included by default.

Gradle

Add a dependency to your build.gradle:

compile group: 'com.arpnetworking.commons', name: 'commons', version: 'VERSION'

Add the Maven Central Repository into your build.gradle:

repositories {
    mavenCentral()
}

SBT

Add a dependency to your project/Build.scala:

val appDependencies = Seq(
    "com.arpnetworking.commons" % "commons" % "VERSION"
)

The Maven Central repository is included by default.

Transitive Dependencies

The project does not declare any non-essential transitive dependencies. For example, it does declare a dependency on SLF4J; however, most other dependencies are marked as provided and should be declared by users of the library. This allows clients to declare only the dependencies of the features that they use, instead of automatically inheriting all dependencies of commons. Each component documents its dependencies and the version defined in the pom for testing should be considered the minimum version of each dependency. As the library grows we may consider splitting it into a multi-module project with each submodule explicitly declaring its dependencies.

Object Mapper Factory

The factory exposes a global singleton Jackson's ObjectMapper via the getInstance method to reduce memory footprint and to ensure a consistent global configuration for ObjectMapper. The global instance is read-only and is protected by a dynamic proxy which prevents modification. The factory can also create new modifiable instances with the same base configuration via the createInstance method.

If these modules are available they are registered with ObjectMapper:

• com.fasterxml.jackson.datatype.guava.GuavaModule (from: com.fasterxml.jackson.datatype:jackson-datatype-guava)
• com.fasterxml.jackson.datatype.jdk8.Jdk8Module (from: com.fasterxml.jackson.datatype:jackson-datatype-jdk8)
• com.fasterxml.jackson.datatype.joda.JodaModule (from: com.fasterxml.jackson.datatype:jackson-datatype-joda)
• com.fasterxml.jackson.datatype.jsr310.JavaTimeModule (from: com.fasterxml.jackson.datatype:jackson-datatype-jsr310)

Additionally, you may specify a comma separated list of additional module class names to register using the system property commons.object-mapper-additional-module-class-names. For example:

-Dcommons.object-mapper-additional-module-class-names=com.example.MyModule,com.fasterxml.jackson.module.afterburner.AfterburnerModule

Builder Validation Class Processor

Add the Maven Javassist Plugin to your project and configure it to execute the ValidationProcessor. Optionally, enable processing of test classes with the test-process goal.

<plugin>
  <groupId>com.arpnetworking.commons</groupId>
  <artifactId>javassist-maven-plugin</artifactId>
  <version>0.1.0</version>
  <executions>
    <execution>
      <id>javassist-process</id>
      <goals>
        <goal>process</goal>
      </goals>
      <configuration>
        <processor>com.arpnetworking.commons.builder.ValidationProcessor</processor>
      </configuration>
    </execution>
  </executions>
</plugin>

Next, add a dependency on maven-javassist-core:

<dependency>
   <groupId>com.arpnetworking.commons</groupId>
   <artifactId>javassist-maven-core</artifactId>
   <version>0.1.0</version>
</dependency>

Processing the validation rules into your classes instead of using OVal's built-in reflective processing can greatly improve the performance of your application.

Building

Prerequisites:

• JDK8 (Or Invoke with JDKW)

Building:

commons> ./jdk-wrapper.sh ./mvnw verify

To use the local version you must first install it locally:

commons> ./jdk-wrapper.sh ./mvnw install

You can determine the version of the local build from the pom file. Using the local version is intended only for testing or development.

You may also need to add the local repository to your build in order to pick-up the local version:

• Maven - Included by default.
• Gradle - Add mavenLocal() to build.gradle in the repositories block.
• SBT - Add resolvers += Resolver.mavenLocal into project/plugins.sbt.

Performance Test

Running:

commons> ./jdk-wrapper.sh ./mvnw test -PunitPerformanceTest

Results:

• JSON formatted performance results are generated into target/perf as specified in each test's JsonBenchmarkConsumer.
• Each JSON performance result file references an HPROF cpu profile generated during the test in profileFile field.
• The performance profiles are text files and have been prefiltered using performance-test.

License

Published under Apache Software License 2.0, see LICENSE

© Groupon Inc., 2015