Erlang开发电信网管项目实践,Author: Ery Lee Date: December 2008 Email: ery.leegmail.com,Agenda,About Opengoss Project Road to Erlang The Architecture Erlang Highlights What We Got What We Lost About Erlang Syntax Thinking in Software,About Opengoss Project,Whats Opengoss?,Next Generation Network and Business Management System One uniform platform based on Linux,Erlang/OTP and ROR Different applications for WIFI, EPON and Enterpise networks,Opengoss Product Family,DMIT, Monet, Evabus, Report, RRDB, WebTopo,Platform,Linux/Unix, MySQL, Oracle, LDAP, Erlang/OTP, Ruby and Rails,Base,N/A,Opengoss Enterprise,Opengoss EPON,Opengoss WLAN,NMS,N/A,N/A,N/A,WIMSS,OSS,Internet,Enterprise,EPON-OSS,WIFI-OSS,Future of Opengoss,The Network Management Cloud,Road to Erlang,Pure Java Originally,First Version: Java and JEE Second Version: Java, OSGi, Eclipse, Model-Driven,Java could do everything, but,Java , JSP , JSF, Struts, Webwork, Velocity , Spring, Hibernate, iBatis, EJB, JDO, JMS, JNDI, JDBC, JAAS, JTA, RMI, IIOP, Web Services, SOAP, SOA, SDO. But, could Java do anything best?,We Had a Big Idea Once,Planned Third Version: OSGI, Component, Plugin, SOA, SDO, SCA,But we have no money and big team.,We are tired of NEW concepts and frameworks.,SDO, SCA, SOA, ESB, BPML,SOBA. Endless WS-* Documents,Into the Wild,We want to be far away.,“Hello Stranger”,Fall in love with REST, Rails and Erlang ,Why Erlang?,Simplicity Performance Concurrency Distribution Fault Tolerance,The Architecture,Architecture,Trouble Ticket 3rd party,Automations,SNMP Probe,P,Syslog Probe,P,API,P,Generic,P,Evabus,SNMP Monitor,M,Ping Monitor,M,TCP Monitor,M,Other Monitor,M,WebPortal (WebTop),DMIT,RRDB,LDAP/MIT,RDMS,Monet,UI,Data,Biz,Collect,Design,Layers,Present Layer: AJAX, Rails Data Center Layer: MySQL, Oracle, RRDB, LDAP Business Layer: DMIT(Distributed MIT), Evabus(Event and Alarm Bus), Monet(Distributed network monitor) Data Collection Layer: Probe, Monitor, Mediator,DMIT,LDAP and Syncrepl,Evabus,Concurrent Event and Alarm Process Line,Monet,Massively distributed network monitor and data collection,Errd,RRDTool Erlang port,Erlang Highlights,Master/Slave and Pool,Distribution and load balance.,Master Applications,Slave Applications,Sample code: pool,handle_cast(add, Dn, Attrs, State) - Node = pool:get_node(), rpc:call(Node, monet_agent, monitor, Dn, Attrs), ets:insert(mon_entry_table, Dn, Node), noreply, State;,OTP Behaviors,application supervisor gen_server gen_event gen_fsm gen_monitor,Supervisor tree,gen_server: opengoss_mysql,-module(opengoss_mysql). -behaviour(gen_server). -export(insert/2, select/1, select/2, select/3, update/2, update/3, delete/2). ,gen_server: opengoss_mysql(cont),opengoss_mysql:select(wifi_mobile_units, id, mac, ap_dn, Dn) opengoss_mysql:update(wifi_mobile_units, last_seen, datetime, Now, and, ap_Dn, Dn, in, id, UpdatedIds) opengoss_mysql:delete(wifi_mobile_units, and, ap_Dn, Dn, in, id, DeletedIds);,gen_event: mit_event_h,handle_event(present, Dn, Entry, State) - handle_add_entry(Dn, Entry), ok, State; handle_event(add, Dn, Entry, State) - handle_add_entry(Dn, Entry), ok, State; handle_event(modify, Dn, Entry, State) - handle_modify_entry(Dn, Entry), ok, State; handle_event(delete, Dn, _Entry, State) - handle_delete_entry(Dn), ok, State;,gen_fsm: eldap_syncrepl,-module(eldap_syncrepl). -behaviour(gen_fsm). -include(“eldap.hrl“). -include(“ELDAPv3.hrl“). -export(init/1, connecting/2, wait_bind_response/2, wait_syncrepl_response/2, handle_event/3, handle_sync_event/4, handle_info/3, terminate/3, code_change/4, close/0).,Other libraries,SNMP Mochiweb Errd Eldap MySQL driver Cron,What We Got,Productivity,Small team to develop a NMS product 2 Ajax/Html, 2 Rails/DB, 1 Erlang 2 days to coding syncrepl protocol,Performance,1 HP380, 2 CPUs, 4G mem, 8 Cores 1 Oracle, 1 Mysql, 1 OpenLdap, 4 Mongrel, 1 Master, 4Slaves 5 minutes interval 10+ measure items average Collect 200 Switches, 1200 Aps, 8000 Interfaces,Concurrency,8000+ collect processes 80 SNMP client 80 PING 30 RRDTools 4 Erlang SNMP Client,Scalability,Massively Distributed Data Collection Scale from 1000+ to 100,000+ Aps Try to resolve IO bottleneck Try to partition data,Stability,Never stop monitor engine Failure Recover Hot code loading,Distribution,Transparent distribution No effort to get master/slave,Happiness,Less code, Less noises More Happiness,Loneliness,No Girls?,What We Lost,Java,Comprehensive matured libraries and frameworks The Java community,Buzzword,No SOA, SCA, SDO, ESB finally.,About Erlang Syntax,Love,Function Programming? Pattern match List comprehension,Hate,Ugly If String Support Records,Thinking in Software,Far away from SOA,SOAP Died. WS-* is dying. And then SOA?,OO is over evaluated,The revolution is RDBMS and C Language http:/pojo.javaeye.com/,Its just Data,IT was named as “Data Processing“ in enterprise. The data looks like table and records in DB The data looks like objects in busin