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use xfstruct::*;
use xfstate::*;
use dispatcher::*;
#[derive(Debug)]
pub enum XFlowStatus {
Uninitialized,
Initialized,
Running,
Finished,
Aborted,
TimedOut,
InvalidState,
}
pub struct XFlowRunner<'a> {
status: XFlowStatus,
xflow: &'a XFlowStruct,
dispatcher: &'a Dispatcher<'a>,
state: XFState,
current_node: Option<&'a XFlowNode>,
}
impl<'a> XFlowRunner<'a> {
pub fn new(xflow: &'a XFlowStruct, dispatcher: &'a Dispatcher<'a>) -> XFlowRunner<'a> {
let mut state = XFState::new();
for xvar in &xflow.variables.input {
state.add(&xvar);
}
for xvar in &xflow.variables.local {
state.add(&xvar);
}
match xflow.get_entry_node() {
Ok(node) => {
XFlowRunner {
status: XFlowStatus::Initialized,
xflow: xflow,
dispatcher: dispatcher,
state: state,
current_node: Some(node),
}
}
_ => {
XFlowRunner {
status: XFlowStatus::Uninitialized,
xflow: xflow,
dispatcher: dispatcher,
state: state,
current_node: None,
}
}
}
}
pub fn can_run(&self) -> bool {
match self.status {
XFlowStatus::Initialized | XFlowStatus::Running => true,
_ => false,
}
}
pub fn is_initialized(&self) -> bool {
match self.status {
XFlowStatus::Initialized => true,
_ => false,
}
}
pub fn is_completed_ok(&self) -> bool {
match self.status {
XFlowStatus::Finished => true,
_ => false,
}
}
pub fn run(&mut self) -> () {
while self.can_run() {
self.step();
}
}
pub fn step(&mut self) -> bool {
self.next_node();
self.run_node()
}
fn run_node(&mut self) -> bool {
let st = &mut self.state;
if let Some(node) = self.current_node {
self.status = XFlowStatus::Running;
self.dispatcher.dispatch(node, st);
true
} else {
self.status = XFlowStatus::Finished;
false
}
}
fn next_node(&mut self) -> () {
if let Some(current_node) = self.current_node {
let edges = self.xflow.get_out_edges(current_node);
match edges.len() {
0 => {
self.status = XFlowStatus::InvalidState;
self.current_node = None;
}
1 => {
if let Some(edge) = edges.first() {
self.current_node = self.xflow.get_node_id(edge.1);
} else {
self.status = XFlowStatus::InvalidState;
self.current_node = None;
}
}
_ => {
let branches: Vec<&XFlowBranch> = self.xflow
.get_out_branches(current_node.id)
.iter()
.filter({
|branch| {
let xv = self.state
.get(&branch.xvar
.name);
if let Some(xvar) = xv {
*xvar == branch.xvar
} else {
false
}
}
})
.cloned()
.collect();
match branches.len() {
0 => {
self.status = XFlowStatus::InvalidState;
self.current_node = None;
}
1 => {
if let Some(branch) = branches.first() {
self.current_node = self.xflow.get_node_id(branch.edge.1);
} else {
self.status = XFlowStatus::InvalidState;
self.current_node = None;
}
}
_ => {
self.status = XFlowStatus::InvalidState;
self.current_node = None;
}
}
}
}
} else {
self.status = XFlowStatus::InvalidState;
self.current_node = None;
}
}
}