• Stars
    star
    292
  • Rank 142,152 (Top 3 %)
  • Language
    Java
  • License
    Apache License 2.0
  • Created about 14 years ago
  • Updated 3 months ago

Reviews

There are no reviews yet. Be the first to send feedback to the community and the maintainers!

Repository Details

Ultra-high performance non-blocking XML processor (Stax API + extensions)

Overview

Aalto XML processor is an ultra-high performance next generation Stax XML processor implementation, implementing both basic Stax API (javax.xml.stream) and Stax2 API extension (org.codehaus.woodstox.stax2). In addition, it also implements SAX2 API.

In additional to standard Java XML interfaces, one unique feature not implemented by any other Java XML parser that we are aware is so-called non-blocking (asynchronous) XML parsing: ability to parse XML without using blocking I/O, necessary for fully asynchronous processing such as those with Akka framework. Aalto non-blocking API is a minimalistic extension above Stax/Stax2 API to allow indication of "not yet available" token (EVENT_INCOMPLETE) as well as feeding of input (since InputStream can not be used as it blocks)

Aalto is licensed under Apache License 2.0

Status

Build Status Javadoc Tidelift

Support

There are 2 types of support available:

Contributing

For simple bug reports and fixes, and feature requests, please simply use projects Issue Tracker, with exception of security-related issues for which we recommend filing a Tidelift security contact (NOTE: you do NOT have to be a subscriber to do this).

Documentation

JDK Compatibility

Aalto 1.x:

  • Can be used on JDK versions 6 (1.6) and up
    • needs JDK 8 or higher to build as of Aalto 1.2.0
  • Contains Java 9 Module definition (module-info.class) starting with version 1.2.0

Usage

Dependency

Aalto dependency is usually added via Maven repository, so something like:

<dependency>
    <groupId>com.fasterxml</groupId>
    <artifactId>aalto-xml</artifactId>
    <version>1.3.1</version>
</dependency>

Blocking XML parsing (Stax, SAX)

Blocking XML parsing is done using one of standard interfaces:

  • Stax (javax.xml.stream) interface -- countless tutorials exist.
    • Also implements Stax2 extension
    • StaxMate is a good companion library for more convenient access

Non-blocking ("async") XML parsing

Non-blocking parsing interface is extension of basic Stax (and Stax2) API, with extensions defined in 'com.fasterxml.aalto' package:

  • AsyncXMLInputFactory offers factory methods for creating non-blocking parsers
  • AsyncXMLStreamReader is extended type that non-blocking parsers implement
    • AsyncXMLStreamReader.EVENT_INCOMPLETE (value 257; just outside range reserved by Stax API) is used to denote "not yet available" (without more data)
    • Method getInputFeeder() is used to access object of type 'AsyncInputFeeder' used to feed input non-blocking way
  • AsyncInputFeeder contains methods for feeding input.

Typical usage pattern is one where block of input is fed to parser, and zero or more complete events are read using basic 'XMLStreamReader.next()' method; and once 'EVENT_INCOMPLETE' is returned, more input needs to be given. AsyncXMLStreamReader itself does not buffer input beyond a single block; caller is responsible for additional buffering, if any. See Async parsing for details.

Construction of AsyncXMLInputFactory is simple; instance may be constructed with or without initial content to parse:

AsyncXMLInputFactory f = new InputFactoryImpl();
// IF there is content use this:
AsyncXMLStreamReader<AsyncByteArrayFeeder> parser = f.createAsyncFor(byteArray);
// If NO CONTENT yet available, just use this:
AsyncXMLStreamReader<AsyncByteArrayFeeder> parser = f.createAsyncForByteArray();

and more content is feed via AsyncInputFeeder when getting EVENT_INCOMPLETE via parser.next():

parser.getInputFeeder().feedInput(b, offset, dataLength);

or, if no more input available, indicate end-of-content with

parser.getInputFeeder().endOfInput();

See the Full non-blocking parsing example on Wiki for more details.

Aalto Design goals

  • Ultra-high performance parsing by making the Common Case Fast (similar to original RISC manifesto). This may mean limiting functionality, but never compromising correctness. XML 1.0 compliancy is not sacrificed for speed.
  • Allow non-block, asynchronous parsing: it should be possible to "feed" more input and incrementally get more XML events out, without forcing the current thread to block on I/O read operation.

Related

More Repositories

1

jackson

Main Portal page for the Jackson project
9,099
star
2

jackson-databind

General data-binding package for Jackson (2.x): works on streaming API (core) implementation(s)
Java
3,522
star
3

jackson-core

Core part of Jackson that defines Streaming API as well as basic shared abstractions
Java
2,263
star
4

jackson-module-kotlin

Module that adds support for serialization/deserialization of Kotlin (http://kotlinlang.org) classes and data classes.
Kotlin
1,123
star
5

jackson-annotations

Core annotations (annotations that only depend on jackson-core) for Jackson data processor
Java
1,029
star
6

jackson-docs

Documentation for the Jackson JSON processor.
727
star
7

jackson-dataformat-xml

Extension for Jackson JSON processor that adds support for serializing POJOs as XML (and deserializing from XML) as an alternative to JSON
Java
570
star
8

jackson-module-scala

Add-on module for Jackson (https://github.com/FasterXML/jackson) to support Scala-specific datatypes
Scala
501
star
9

jackson-dataformats-text

Uber-project for (some) standard Jackson textual format backends: csv, properties, yaml (xml to be added in future)
Java
405
star
10

jackson-modules-java8

Set of support modules for Java 8 datatypes (Optionals, date/time) and features (parameter names)
Java
400
star
11

jackson-module-jsonSchema

Module for generating JSON Schema (v3) definitions from POJOs
Java
369
star
12

jackson-datatype-hibernate

Add-on module for Jackson JSON processor which handles Hibernate (https://www.hibernate.org/) datatypes; and specifically aspects of lazy-loading
Java
318
star
13

jackson-dataformats-binary

Uber-project for standard Jackson binary format backends: avro, cbor, ion, protobuf, smile
Java
313
star
14

java-classmate

Library for introspecting generic type information of types, member/static methods, fields. Especially useful for POJO/Bean introspection.
Java
258
star
15

jackson-jr

Stand-alone data-binding module designed as a light-weight (and -featured) alternative to `jackson-databind`: will only deal with "Maps, Lists, Strings, wrappers and Java Beans" (jr-objects), or simple read-only trees (jr-stree)
Java
239
star
16

woodstox

The gold standard Stax XML API implementation. Now at Github.
Java
226
star
17

jackson-dataformat-csv

(DEPRECATED) -- moved under: https://github.com/FasterXML/jackson-dataformats-text
Java
194
star
18

jackson-modules-base

Uber-project for foundational modules of Jackson that build directly on core components but nothing else; not including data format or datatype modules
Java
167
star
19

jackson-datatype-joda

Extension module to properly support full datatype set of Joda datetime library
Java
140
star
20

jackson-dataformat-yaml

Jackson module to add YAML backend (parser/generator adapters)
Java
138
star
21

jackson-jaxrs-providers

Multi-module project that contains Jackson-based "old" JAX-RS (ones under `javax.ws.rs`) providers for JSON, XML, YAML, Smile, CBOR formats
Java
111
star
22

smile-format-specification

New home for Smile format (https://en.wikipedia.org/wiki/Smile_(data_interchange_format))
92
star
23

jackson-datatype-jsr310

(DEPRECATED) -- moved under `jackson-modules-java8` repo: https://github.com/FasterXML/jackson-modules-java8
Java
92
star
24

jackson-module-afterburner

(DEPRECATED) -- moved under `jackson-modules-base`
Java
91
star
25

jackson-datatypes-collections

Jackson project that contains various collection-oriented datatype libraries: Eclipse Collections, Guava, HPPC, PCollections
Java
77
star
26

jackson-datatype-guava

(DEPRECATED) -- moved under `jackson-datatypes-collections`
Java
68
star
27

jackson-datatype-jdk8

(DEPRECATED) -- moved under `jackson-modules-java8`
Java
57
star
28

jackson-bom

Bill of materials POM for Jackson projects
Logos
54
star
29

jackson-datatype-json-org

(DEPRECATED) Support for org.json data types, to ease migration out of code that uses them
Java
49
star
30

jackson-dataformat-smile

(DEPRECATED) -- moved under `jackson-dataformats-binary
Java
44
star
31

jackson-module-jaxb-annotations

(DEPRECATED!!!) Moved to: https://github.com/FasterXML/jackson-modules-base/
Java
44
star
32

StaxMate

StaxMate: Automatic Shifting for Streaming XML Processing
Java
41
star
33

stax2-api

Extension API for Stax, Java pull-parsing API (STreaming Api for Xml)
Java
40
star
34

jackson-dataformat-cbor

(DEPRECATED) -- moved under `jackson-dataformats-binary`
Java
38
star
35

jackson-dataformat-avro

(DEPRECATED) -- moved under `jackson-dataformats-binary
Java
38
star
36

jackson-module-parameter-names

(DEPRECATED) -- moved under `jackson-modules-java8`
Java
33
star
37

jackson-dataformat-protobuf

(DEPRECATED) -- moved under `jackson-dataformats-binary`
Java
32
star
38

jackson-module-mrbean

(DEPRECATED) -- moved under `jackson-modules-base`
Java
27
star
39

jackson-datatypes-misc

Collection of common Jackson datatype modules not part of other multi-project repos
Java
22
star
40

TransiStore

Distributed data store for transient (temporary, time-bound) data. Based on ClusterMate/StoreMate
Java
21
star
41

jackson-datatype-jsr353

(DEPRECATED) -- moved under `jackson-datatypes-misc` https://github.com/FasterXML/jackson-datatypes-misc/
Java
19
star
42

jackson-future-ideas

Repository for SOLE PURPOSE of issue tracker and Wiki for NEW IDEAS. Please: NO BUG REPORTS.
18
star
43

jackson-benchmarks

Project that contains JMH-based micro-benchmarks to help with optimizations
Java
15
star
44

jackson-jakarta-rs-providers

Multi-module project that contains Jackson-based "new" Jakarta-RS (nee "JAX-RS" -- ones under `jakarta.ws.rs`) providers for JSON, XML, YAML, Smile, CBOR formats
Java
14
star
45

jackson-dataformat-properties

(DEPRECATED) -- moved under `jackson-dataformats-text`
Java
13
star
46

jackson-datatype-hppc

(DEPRECATED) -- moved under `jackson-datatypes-collections`
Java
9
star
47

oss-parent

Grandpa pom for all projects under FasterXML git umbrella
8
star
48

jackson-datatype-jdk7

(DEPRECATED) -- included in `jackson-databind` as of Jackson 2.7
Java
7
star
49

jvm-json-benchmark

Performance benchmark suite that compares data-binding (JSON<->POJO) performance of Java JSON libraries. Uses Japex benchmark framework for running tests and visualizing results.
Java
7
star
50

Hacktoberfest2020

Central repository for FasterXML activities related to Hacktoberfest 2020 by DigitalOcean (https://hacktoberfest.digitalocean.com/)
6
star
51

jackson-module-guice

(DEPRECATED) -- moved under `jackson-modules-base`
Java
5
star
52

jackson3-dev

Repository for planning and tracking development of Jackson 3.0, with bigger API changes
5
star
53

jackson-module-paranamer

(DEPRECATED) -- moved under `jackson-modules-base`
Java
5
star
54

jackson-parent

Parent pom for all core Jackson components (but only those -- users should use `jackson-bom`)
5
star
55

jackson-schema-maven-plugin

Maven plug-in for generation JSON Schemas using Jackson library and extension modules
Java
4
star
56

jackson-jdk11-compat-test

Test project for verifying Jackson's support of JDK9+ Module system
Java
3
star
57

jackson-dataformat-thrift

Not Yet A Thing -- placeholder for possible future implementation
Java
3
star
58

jackson-integration-tests

Project that contains integration tests across Jackson components
Java
3
star
59

jackson-jdk17-compat-test

Test suite for JDK 16 compatibility of Jackson components, mainly jackson-databind
Java
3
star
60

jackson-tools

Collection of command-line tools related to Jackson data processor, such as format decoders
Java
2
star
61

jackson-dataformat-ini

(Not Yet a Thing -- Placholder!) Data format implementation for "ini files", used on Windows, Python
Java
2
star
62

OmniPipe

Distributed data queue implementation that builds on ClusterMate/StoreMate foundation
2
star
63

jackson-jdk6-compat-test

Test project to verify JDK6 compatibility of Jackson versions 2.7 and anbove
Java
2
star
64

jackson-module-osgi

(DEPRECATED) -- moved under `jackson-modules-base`
Java
2
star
65

jackson-gh-actions

Repository for reusable Github workflow actions for Jackson project
2
star
66

Woodstox4

Backup repository for older versions of Woodstox (pre-5.0), migrated from Codehaus
Java
1
star