- Defined in:
#synchronize(seconds = session_options.default_max_wait_time, errors: nil) ⇒ Object
This method is Capybara's primary defence against asynchronicity problems. It works by attempting to run a given block of code until it succeeds. The exact behaviour of this method depends on a number of factors. Basically there are certain exceptions which, when raised from the block, instead of bubbling up, are caught, and the block is re-run.
Certain drivers, such as RackTest, have no support for asynchronous processes, these drivers run the block, and any error raised bubbles up immediately. This allows faster turn around in the case where an expectation fails.
Only exceptions that areor any subclass thereof cause the block to be rerun. Drivers may specify additional exceptions which also cause reruns. This usually occurs when a node is manipulated which no longer exists on the page. For example, the Selenium driver specifies `Selenium::WebDriver::Error::ObsoleteElementError`.
As long as any of these exceptions are thrown, the block is re-run, until a certain amount of time passes. The amount of time defaults toand can be overridden through the `seconds` argument. This time is compared with the system time to see how much time has passed. On rubies/platforms which don't support access to a monotonic process clock if the return value of `Time.now` is stubbed out, Capybara will raise `Capybara::FrozenInTime`.
77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
# File 'lib/capybara/node/base.rb', line 77 def synchronize(seconds = .default_max_wait_time, errors: nil) if session.synchronized yield else session.synchronized = true start_time = ::. begin yield rescue => e session.raise_server_error! raise e unless driver.wait? && catch_error?(e, errors) raise e if (::. - start_time) >= seconds sleep(0.05) raise ::, "time appears to be frozen, Capybara does not work with libraries which freeze time, consider using time travelling instead" if ::. == start_time reload if .automatic_reload retry ensure session.synchronized = false end end end