def create_fsm(self, target, ssid):
"""
Creates a FSM for SQLstream instance state/transitions.
The entry for its SSID must be defined in the target's sqlstreams dict.
"""
fsm = AsyncFSM(SSStates.S_INIT, None)
# extract SSID from kwargs, set up vars needed for install/uninstall
sdpport = target.sqlstreams[ssid]['sdpport']
hsqldbport = target.sqlstreams[ssid]['hsqldbport']
dirname = target.sqlstreams[ssid]['dirname']
seismic_jar = resource_filename(__name__, "data/ucsd-seismic.jar")
installerbin = resource_filename(__name__, "data/install_sqlstream.sh")
log.debug(installerbin)
# 1. INIT <-> INSTALLED
proc_installer = EnvOSProcess(
binary=installerbin,
spawnargs=[sdpport, hsqldbport, seismic_jar, dirname])
forward_task = proc_installer.spawn
backward_task = lambda: shutil.rmtree(dirname)
fsm.add_transition(SSStates.E_INSTALL, SSStates.S_INIT, forward_task,
SSStates.S_INSTALLED)
fsm.add_transition(SSStates.E_UNINSTALL, SSStates.S_INSTALLED,
backward_task, SSStates.S_INIT)
# 2. INSTALLED <-> READY
proc_server = OSSSServerProcess(
binroot=dirname, extraenv={"JAVA_HOME": "/usr/local/JDK1.6"})
proc_server.addCallback(target._sqlstream_ended, sqlstreamid=ssid)
proc_server.addReadyCallback(target._sqlstream_started,
sqlstreamid=ssid)
target.sqlstreams[ssid][
'_serverproc'] = proc_server # store it here, it still runs
forward_task = proc_server.spawn
backward_task = proc_server.close
fsm.add_transition(SSStates.E_RUNDAEMON, SSStates.S_INSTALLED,
forward_task, SSStates.S_READY)
fsm.add_transition(SSStates.E_STOPDAEMON, SSStates.S_READY,
backward_task, SSStates.S_INSTALLED)
# 3. READY <-> DEFINED
proc_loaddefs = OSSSClientProcess(
spawnargs=[sdpport],
sqlcommands=target.sqlstreams[ssid]['_sql_defs'],
binroot=dirname,
extraenv={"JAVA_HOME": "/usr/local/JDK1.6"})
forward_task = proc_loaddefs.spawn
# 18 Jan 2011 - Disabled due to lack of ability to turn consumer off - will freeze sqllineClient
#proc_unloaddefs = OSSSClientProcess(spawnargs=[sdpport], sqlcommands="DROP SCHEMA UCSD CASCADE;", binroot=dirname, extraenv={"JAVA_HOME": "/usr/local/JDK1.6"})
#backward_task = proc_unloaddefs.spawn
backward_task = lambda: False # can't do pass here?
fsm.add_transition(SSStates.E_LOADDEFS, SSStates.S_READY, forward_task,
SSStates.S_DEFINED)
fsm.add_transition(SSStates.E_UNLOADDEFS, SSStates.S_DEFINED,
backward_task, SSStates.S_READY)
# 4. DEFINED <-> RUNNING
proc_pumpson = OSSSClientProcess(
spawnargs=[sdpport],
sqlcommands=target._get_sql_pumps_on(),
binroot=dirname,
extraenv={"JAVA_HOME": "/usr/local/JDK1.6"})
forward_task = proc_pumpson.spawn
proc_pumpsoff = OSSSClientProcess(
spawnargs=[sdpport],
sqlcommands=target._get_sql_pumps_off(),
binroot=dirname,
extraenv={"JAVA_HOME": "/usr/local/JDK1.6"})
backward_task = proc_pumpsoff.spawn
fsm.add_transition(SSStates.E_PUMPSON, SSStates.S_DEFINED,
forward_task, SSStates.S_RUNNING)
fsm.add_transition(SSStates.E_PUMPSOFF, SSStates.S_RUNNING,
backward_task, SSStates.S_DEFINED)
return fsm
