Download Introduction to MINA

Introduction to MINA
Trustin Lee
[email protected]
http://people.apache.org/~trustin/
Agenda
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December 13, 2005
Overview
In-depth View
Implementation Demo
Future
Conclusion
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Overview
A Multipurpose Infrastructure for Network Applications
Overview
What is MINA?
• An acronym for
A Multipurpose
Infrastructure
For Network
Applications
• A network application framework
• A subproject of
• the Apache Directory Project
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Overview
Features
• Unified API
• Easy
• Event-driven
• Abstracted from existing I/O APIs
• Elegant application design
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Overview
Supported Transport Layers
• Out-of-the-box
• Based on Java NIO (New I/O)
• Socket (TCP/IP)
• Datagram (UDP/IP)
• In-VM pipe
• Pending:
• Multicast
• Serial and parallel port
• <your favorite one>
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Overview
Elegant Application Design
• Unit test friendly
• The Abstract API lets you test your
application without a real client or server
via mock objects.
• Extensible
• Runtime modification of application
behavior using ‘filters’
• Maintainable and Reusable
• Separation of networking code (MINA),
protocol codec, and business logic
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Overview
Who Uses MINA?
• The Apache Directory Project
• LDAP
• Kerberos
• DNS
• NTP
• QuickFIX – QuickFIXEngine.org
• Financial Information eXchange Protocol
• RED5 Server – OSFlash.org
• Macromedia Flash Media RTMP
• JStyx – JStyx.sf.net
• Styx, a file sharing NFS-like protocol
• Proprietary SMPP / SMS servers
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In-depth View
A Multipurpose Infrastructure for Network Applications
In-depth
At the First Glance
Low-level
I/O
Low-level
I/O
Remote Peer
I/O Event
Filtered I/O
Request
IoSessionManager
IoFilterChain
IoFilter #1
IoFilter #2
Filtered I/O
Event
I/O
Request
IoFilter #3
IoSession
IoHandler
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Legend
Core
Extension Point
Protocol Implementation
• IoSessionManager
• Where real I/O occurs
• Generates I/O events
• Processes I/O requests
• IoFilters
• Filters I/O events and requests
• IoHandler
• <Your protocol logic>
• IoSession
• Represents a connection
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In-depth
IoSessionManagers
Server-side:
Accepts clients
IoSessionManager
IoAcceptor
nio::SocketAcceptor
IoConnector
And their
implementations
nio::DatagramAcceptor
nio::SocketConnector
nio::DatagramConnector
v mpipe::VmPipeAcceptor
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Client-side:
Connects to a server
v mpipe::VmPipeConnector
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In-depth
IoSession
• A connection between an IoHandler and
a remote peer
• Provides ways to send an I/O request
• Write a message
• Close the current connection
• State information
• Idleness
• Last I/O time
• Transport layer parameters
• Attributes: Protocol-specific data storage
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In-depth
IoHandler
• Where you implement your network
application
«interface»
common::IoHandler
~
~
~
~
~
~
~
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sessionCreated(IoSession) : void
sessionOpened(IoSession) : void
sessionClosed(IoSession) : void
sessionIdle(IoSession, IdleStatus) : void
exceptionCaught(IoSession, Throwable) : void
messageReceived(IoSession, Object) : void
messageSent(IoSession, Object) : void
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In-depth
IoFilter
• A reusable event & request interceptor
• Hot-deployable
• Scope:
• An IoSession or an IoSessionManager
Event A
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IoFilter
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Event A’
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In-depth
IoFilter (Cont’d)
• Out-of-the box filters:
• SSL / TLS
• Remote peer blacklisting
• Thread pool
• Logger
• Pending filters:
• Profiler
• Traffic throttle
• Lightweight firewall
• Overload prevention
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In-depth
Thread Pooling with IoFilter
No thread pool: single thread setting for minimal latency
IoAcceptor
IoHandler
One thread pool: general setting for high throughput
Thread
Pool
Filter
IoAcceptor
IoHandler
More than one thread pool: special setting for CPU-intensive jobs
IoAcceptor
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Thread
Pool
Filter
CPUintensive
jobs
(IoFilter)
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Thread
Pool
Filter
IoHandler
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In-depth
Protocol Codec
• By default,
• IoHandler uses a ByteBuffer to do I/O
 Tight coupling of
protocol codec and business logic :(
• ProtocolCodecFilter is an IoFilter
• Performs transformation between
a ByteBuffer and a POJO (Plain Old Java Object)
 Clear separation
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In-depth
Protocol Codec (Cont’d)
Legend
Remote Peer
Core
Low-level
I/O
Low-level
I/O
Extension Point
Protocol Implementation
Filtered I/O
Event
I/O
Request
Decode
Decoder
ProtocolCodecFilter
Encode
Encoder
IoFilterChain
Protocol Codec Factory
I/O Event
Filtered I/O
Request
IoSessionManager
IoSession
IoHandler
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In-depth
In-VM Pipe Transport Type
• A virtual pipe
• Requires no protocol codec
• I/O events and requests are converted into
direct method invocations.
• Two MINA servers in the same VM
• Can bypass:
• Protocol codec
• Network latency
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Implementation Demo
A Multipurpose Infrastructure for Network Applications
Demo
More Complex Examples
• Realistic examples:
• Visit Here:
http://directory.apache.org
/subprojects/network/getting_started.html
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Future
A Multipurpose Infrastructure for Network Applications
Future
MINA as a Platform
Real-Time
Management
System
Integration
with Apache
ASN.1 for
complex protocols
HTTP
SMTP
FTP
……
Popular
Protocols
Rapidly
Users
can build customized
Just like drawing
servers
Prototyped
Kerberos
with
ready-made protocol
an ER
Diagrams!
codecs.
Protocol
Visual Protocol
Designer
(ASN.1-based)
LDAP
Others
ASN.1
Codec
MINA
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Future
Real-Time Management System
• A universal management view
• JMX console and Web browser
• Real time access
• Server traffic
• IoFilter Hot-deploy
• Which client is sending what message now?
• Which message takes toolong to process?
• And <what you want to monitor>
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Future
We Need Your Participation!
• Sounds exciting?
• Please help MINA team!
• Try MINA
• Ask questions
• Criticize
• Report bugs
• Benchmark
• Contribute code
• Contribute a tutorial
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Conclusion
A Multipurpose Infrastructure for Network Applications
Conclusion
Conclusion
• MINA is an extensible network
application framework that helps you
implement your network application
elegantly without compromising
productivity.
• MINA can be a complete network
application development &
management platform if we get our
effort together.
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Resources
• Homepage
• http://directory.apache.org/subprojects/network/
• Mailing List
• [email protected]
(Please use ‘[mina] prefix)
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Thank You!
Q&A