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.\" ========================================================================
.\"
.IX Title "VM::EC2::Instance::State::Change 3pm"
.TH VM::EC2::Instance::State::Change 3pm "2016-06-04" "perl v5.22.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
VM::EC2::Instance::State::Change \- Represent an EC2 instance's change in state.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&     # find all stopped instances
\&    @instances = $ec2\->describe_instances(\-filter=>{\*(Aqinstance\-state\-name\*(Aq=>\*(Aqstopped\*(Aq});
\&
\&    # start them
\&    @state_change = $ec2\->start_instances(@instances)
\& 
\&    foreach my $sc (@state_change) {
\&        my $instanceId    = $sc\->instanceId;
\&        my $currentState  = $sc\->currentState;
\&        my $previousState = $sc\->previousState;
\&    }
\&
\&    # poll till the first instance is running
\&    sleep 2 until $state_change[0]\->current_status eq \*(Aqrunning\*(Aq;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This object represents a state change in an Amazon \s-1EC2\s0 instance.  It
is returned by \s-1VM::EC2\s0 \fIstart_instances()\fR, \fIstop_instances()\fR,
\&\fIterminate_instances()\fR, \fIreboot_instances()\fR and the corresponding
VM::EC2::Instance methods. In addition, this object is returned by
calls to VM::EC2::Instance\->\fIinstanceState()\fR.
.SH "METHODS"
.IX Header "METHODS"
These object methods are supported:
.PP
.Vb 7
\& instanceId      \-\- The instanceId.
\& currentState    \-\- The instanceId\*(Aqs current state AT THE TIME
\&                     THE STATECHANGE OBJECT WAS CREATED. One of
\&                     "terminated", "running", "stopped", "stopping",
\&                     "shutting\-down".
\& previousState   \-\- The instanceID\*(Aqs previous state AT THE TIME
\&                     THE STATECHANGE OBJECT WAS CREATED.
.Ve
.PP
Note that currentState and previousState return a
VM::EC2::Instance::State object, which provides both string-readable
forms and numeric codes representing the state.
.PP
In addition, the method provides the following convenience method:
.ie n .SS "$state = $state_change\->\fIcurrent_status()\fP"
.el .SS "\f(CW$state\fP = \f(CW$state_change\fP\->\fIcurrent_status()\fP"
.IX Subsection "$state = $state_change->current_status()"
This method returns the current state of the instance. This is the
correct method to call if you are interested in knowing what the
instance is doing right now.
.SS "\s-1STRING OVERLOADING\s0"
.IX Subsection "STRING OVERLOADING"
In a string context, the method will return the string representation of
currentState.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\s-1VM::EC2\s0
VM::EC2::Generic
VM::EC2::State
VM::EC2::Instance
.SH "AUTHOR"
.IX Header "AUTHOR"
Lincoln Stein <lincoln.stein@gmail.com>.
.PP
Copyright (c) 2011 Ontario Institute for Cancer Research
.PP
This package and its accompanying libraries is free software; you can
redistribute it and/or modify it under the terms of the \s-1GPL \s0(either
version 1, or at your option, any later version) or the Artistic
License 2.0.  Refer to \s-1LICENSE\s0 for the full license text. In addition,
please see \s-1DISCLAIMER\s0.txt for disclaimers of warranty.