man VM::EC2::Instance::State::Change (3): Represent an EC2 instance's change in state.

SYNOPSIS

# find all stopped instances
@instances = $ec2->describe_instances(-filter=>{'instance-state-name'=>'stopped'});
# 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 'running';

DESCRIPTION

This object represents a state change in an Amazon EC2 instance. It is returned by VM::EC2 start_instances(), stop_instances(), terminate_instances(), reboot_instances() and the corresponding VM::EC2::Instance methods. In addition, this object is returned by calls to VM::EC2::Instance->instanceState().

METHODS

These object methods are supported:

 instanceId      -- The instanceId.
 currentState    -- The instanceId's current state AT THE TIME
                     THE STATECHANGE OBJECT WAS CREATED. One of
                     "terminated", "running", "stopped", "stopping",
                     "shutting-down".
 previousState   -- The instanceID's previous state AT THE TIME
                     THE STATECHANGE OBJECT WAS CREATED.

Note that currentState and previousState return a VM::EC2::Instance::State object, which provides both string-readable forms and numeric codes representing the state.

In addition, the method provides the following convenience method:

$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.

STRING OVERLOADING

In a string context, the method will return the string representation of currentState.

AUTHOR

Lincoln Stein <[email protected]>.