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Jackson module that uses bytecode generation to further speed up data binding (+30-40% throughput for serialization, deserialization)

README.md

Module that will add dynamic bytecode generation for standard Jackson POJO serializers and deserializers, eliminating majority of remaining data binding overhead.

Plugs in using standard Module interface (requiring Jackson 2.0.0 or above).

For Javadocs, Download, see: Wiki.

Build Status

Status

Module is stable and has been used in production environments. Its adoption is not quite as wide as that of core Jackson components, so rough edges may still exist. However, versions from 2.2 up are considered production ready.

Master branch works with Jackson 2.x. Older builds (1.9.4) are still available, and source is under "1.x" branch, but no further development is planned for this version.

Usage

Maven dependency

To use module on Maven-based projects, use following dependency:

<dependency>
  <groupId>com.fasterxml.jackson.module</groupId>
  <artifactId>jackson-module-afterburner</artifactId>
  <version>2.2.0</version>
</dependency>

(or whatever version is most up-to-date at the moment)

Non-Maven

For non-Maven use cases, you download jars from Central Maven repository or Download page.

Databind jar is also a functional OSGi bundle, with proper import/export declarations, so it can be use on OSGi container as is.

Registering module

To use the the Module in Jackson, simply register it with the ObjectMapper instance:

ObjectMapper mapper = new ObjectMapper()
mapper.registerModule(new AfterburnerModule());

after which you just do data-binding as usual:

Value val = mapper.readValue(jsonSource, Value.class);
mapper.writeValue(new File("result.json"), val);

What is optimized?

Following things are optimized:

  • For serialization (POJOs to JSON):
    • Accessors for "getting" values (field access, calling getter method) are inlined using generated code instead of reflection
    • Serializers for small number of 'primitive' types (int, long, String) are replaced with direct calls, instead of getting delegated to JsonSerializers
  • For deserialization (JSON to POJOs)
    • Calls to default (no-argument) constructors are byte-generated instead of using reflection
    • Mutators for "setting" values (field access, calling setter method) are inlined using generated code instead of reflection
    • Deserializers for small number of 'primitive' types (int, long, String) are replaced with direct calls, instead of getting delegated to JsonDeserializers

More

Check out Wiki.

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