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292 lines
8.2 KiB
292 lines
8.2 KiB
use std::cell::RefCell;
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use std::error::Error;
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use std::fmt;
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use loggers::Logger;
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use repository::SymbolRepository;
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use symbols::{Symbol, SymbolRunner};
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#[derive(Debug)]
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pub enum SymbolRunError {
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Symbol(Box<Error>),
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ExecuteDidNotReach(())
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}
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impl Error for SymbolRunError {
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fn description(&self) -> &str {
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match self {
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&SymbolRunError::Symbol(_) => "Symbol execution error",
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&SymbolRunError::ExecuteDidNotReach(_) => "Target not reached after executing symbol"
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}
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}
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fn cause(&self) -> Option<&Error> {
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match self {
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&SymbolRunError::Symbol(ref e) => Some(&**e),
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&SymbolRunError::ExecuteDidNotReach(_) => None
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}
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}
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}
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impl fmt::Display for SymbolRunError {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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&SymbolRunError::Symbol(ref e) => write!(f, "{}", e),
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&SymbolRunError::ExecuteDidNotReach(_) => write!(f, "{}", self.description())
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}
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}
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}
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pub struct InitializingSymbolRunner<L: Logger> {
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logger: RefCell<L>
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}
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impl<L: Logger> InitializingSymbolRunner<L> {
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pub fn new(logger: L) -> Self {
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Self { logger: RefCell::new(logger) }
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}
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}
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impl<L: Logger> SymbolRunner for InitializingSymbolRunner<L> {
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fn run_symbol(&self, symbol: &Symbol) -> Result<(), Box<Error>>
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{
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let mut logger = self.logger.borrow_mut();
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let target_reached = try!(symbol.target_reached());
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if target_reached {
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logger.write(format!("{} already reached", symbol).as_str());
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} else {
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logger.debug(format!("Symbol reports target_reached: {:?}", target_reached).as_str());
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logger.write(format!("Executing {}", symbol).as_str());
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try!(symbol.execute());
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let target_reached = try!(symbol.target_reached());
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logger.debug(format!("Symbol reports target_reached: {:?} (should be true)", target_reached).as_str());
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if !target_reached {
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return Err(Box::new(SymbolRunError::ExecuteDidNotReach(())));
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}
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}
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Ok(())
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}
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}
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pub struct DrySymbolRunner<L: Logger> {
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logger: RefCell<L>
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}
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impl<L: Logger> DrySymbolRunner<L> {
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pub fn new(logger: L) -> Self {
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Self { logger: RefCell::new(logger) }
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}
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}
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impl<L: Logger> SymbolRunner for DrySymbolRunner<L> {
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fn run_symbol(&self, symbol: &Symbol) -> Result<(), Box<Error>>
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{
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let mut logger = self.logger.borrow_mut();
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let target_reached = try!(symbol.target_reached());
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logger.debug(format!("Symbol reports target_reached: {:?}", target_reached).as_str());
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if !target_reached {
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logger.write(format!("Would execute {}", symbol).as_str());
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}
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Ok(())
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}
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}
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pub struct ReportingSymbolRunner<'a, R: 'a + SymbolRunner, L: Logger>(&'a R, RefCell<L>);
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impl<'a, R, L> ReportingSymbolRunner<'a, R, L> where R: SymbolRunner, L: Logger {
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pub fn new(symbol_runner: &'a R, logger: L) -> Self {
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ReportingSymbolRunner(symbol_runner, RefCell::new(logger))
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}
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}
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impl<'a, R, L> SymbolRunner for ReportingSymbolRunner<'a, R, L> where R: SymbolRunner, L: Logger {
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fn run_symbol(&self, symbol: &Symbol) -> Result<(), Box<Error>>
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{
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let mut logger = self.1.borrow_mut();
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logger.debug(format!("Running symbol {}", symbol).as_str());
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let res = self.0.run_symbol(symbol);
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match &res {
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&Err(ref e) => {
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logger.write(format!("Failed on {} with {}, aborting.", symbol, e).as_str());
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},
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&Ok(_) => {
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logger.debug(format!("Successfully finished {}", symbol).as_str());
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}
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}
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res
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}
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}
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use std::collections::HashSet;
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use resources::Resource;
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pub struct NonRepeatingSymbolRunner<R: SymbolRunner> {
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upstream: R,
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done: RefCell<HashSet<Resource>>
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}
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impl<R> NonRepeatingSymbolRunner<R> where R: SymbolRunner {
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pub fn new(symbol_runner: R) -> Self {
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NonRepeatingSymbolRunner{ upstream: symbol_runner, done: RefCell::new(HashSet::new()) }
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}
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}
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impl<R: SymbolRunner> SymbolRunner for NonRepeatingSymbolRunner<R> {
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fn run_symbol(&self, symbol: &Symbol) -> Result<(), Box<Error>>
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{
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if let Some(resources) = symbol.provides() {
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let mut done = self.done.borrow_mut();
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let mut has_to_run = false;
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for resource in resources {
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if !done.contains(&resource) {
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has_to_run = true;
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assert!(done.insert(resource.clone()));
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}
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}
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if !has_to_run {
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return Ok(());
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}
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}
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self.upstream.run_symbol(&*symbol)
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}
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}
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use std::marker::PhantomData;
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pub struct RequirementsResolvingSymbolRunner<'a, 's, R: 'a + SymbolRunner, G: 'a + SymbolRepository<'s>>(R, &'a G, PhantomData<Box<Symbol + 's>>);
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impl<'s, 'a: 's, R, G> RequirementsResolvingSymbolRunner<'a, 's, R, G> where R: SymbolRunner, G: SymbolRepository<'s> {
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pub fn new(symbol_runner: R, symbol_repo: &'a G) -> Self {
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RequirementsResolvingSymbolRunner(symbol_runner, symbol_repo, PhantomData)
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}
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}
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impl<'s, 'a: 's, R, G> SymbolRunner for RequirementsResolvingSymbolRunner<'a, 's, R, G> where R: SymbolRunner, G: SymbolRepository<'s> {
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fn run_symbol(&self, symbol: &Symbol) -> Result<(), Box<Error>>
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{
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for resource in symbol.get_prerequisites() {
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if let Some(dep) = self.1.get_symbol(&resource) {
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try!(dep.as_action(self).run());
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}
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}
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self.0.run_symbol(&*symbol)
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}
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}
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// FIXME: Add ExpectingSymbolRunner
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#[cfg(test)]
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mod test {
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use std::cell::RefCell;
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use std::error::Error;
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use std::fmt;
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use loggers::Logger;
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use symbols::{Action, OwnedSymbolAction, Symbol, SymbolAction};
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use schema::SymbolRunner;
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use schema::InitializingSymbolRunner;
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#[derive(Debug, PartialEq, Clone)]
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enum DummySymbolError {
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Error(())
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}
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impl Error for DummySymbolError {
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fn description(&self) -> &str {
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return "Description";
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}
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}
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impl fmt::Display for DummySymbolError {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "Dummy symbol error")
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}
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}
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struct DummySymbol<'a> {
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_execute: &'a Fn() -> Result<(), Box<Error>>,
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_target_reached: &'a Fn() -> Result<bool, Box<Error>>
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}
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impl<'b> Symbol for DummySymbol<'b> {
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fn target_reached(&self) -> Result<bool, Box<Error>> {
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(self._target_reached)()
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}
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fn execute(&self) -> Result<(), Box<Error>> {
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(self._execute)()
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}
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fn as_action<'a>(&'a self, runner: &'a SymbolRunner) -> Box<Action + 'a> {
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Box::new(SymbolAction::new(runner, self))
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}
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fn into_action<'a>(self: Box<Self>, runner: &'a SymbolRunner) -> Box<Action + 'a> where Self: 'a {
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Box::new(OwnedSymbolAction::new(runner, *self))
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}
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}
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impl<'a> fmt::Display for DummySymbol<'a> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "Dummy symbol")
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}
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}
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impl<'a> DummySymbol<'a> {
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fn new(target_reached: &'a Fn() -> Result<bool, Box<Error>>, execute: &'a Fn() -> Result<(), Box<Error>>) -> DummySymbol<'a> {
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DummySymbol { _target_reached: target_reached, _execute: execute }
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}
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}
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struct DummyLogger {
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log: Vec<String>
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}
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impl DummyLogger {
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fn new() -> DummyLogger {
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DummyLogger { log: Vec::new() }
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}
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}
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impl Logger for DummyLogger {
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fn write(&mut self, line: &str) {
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self.log.push(From::from(line));
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}
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fn debug(&mut self, line: &str) {
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self.log.push(From::from(line));
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}
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}
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#[test]
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fn nothing_needed_to_be_done() {
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let result = InitializingSymbolRunner::new(DummyLogger::new()).run_symbol(&DummySymbol::new(&|| Ok(true), &|| Ok(())));
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assert!(result.is_ok());
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}
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#[test]
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fn everything_is_ok() {
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let first = RefCell::new(true);
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let result = InitializingSymbolRunner::new(DummyLogger::new()).run_symbol(&DummySymbol::new(&|| {
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let mut _first = first.borrow_mut();
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Ok(if *_first {
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*_first = false;
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true
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} else {
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false
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})
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}, &|| Ok(())));
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assert!(result.is_ok());
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}
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#[test]
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fn executing_did_not_change_state() {
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let result = InitializingSymbolRunner::new(DummyLogger::new()).run_symbol(&DummySymbol::new(&|| Ok(false), &|| Ok(())));
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assert_eq!(
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result.unwrap_err().description(),
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"Target not reached after executing symbol"
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);
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}
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#[test]
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fn executing_did_not_work() {
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let err = InitializingSymbolRunner::new(DummyLogger::new()).run_symbol(&DummySymbol::new(&|| Ok(false), &|| Err(Box::new(DummySymbolError::Error(()))))).unwrap_err();
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assert_eq!(err.description(), "Description");
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}
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}
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