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This module allows high-level and efficient I/O multiplexing, built upon the
`select` module primitives.
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rJ tdj| ��d�Y nX |dk rbtdj|���|S )z�Return a file descriptor from a file object.
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r � SelectorKeyr r �events�dataz�SelectorKey(fileobj, fd, events, data)
Object used to associate a file object to its backing
file descriptor, selected event mask, and attached data.
� � zFile object registered.zUnderlying file descriptor.z3Events that must be waited for on this file object.zzOptional opaque data associated to this file object.
For example, this could be used to store a per-client session ID.c @ s0 e Zd ZdZdd� Zdd� Zdd� Zdd � Zd
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dS )� BaseSelectora- Selector abstract base class.
A selector supports registering file objects to be monitored for specific
I/O events.
A file object is a file descriptor or any object with a `fileno()` method.
An arbitrary object can be attached to the file object, which can be used
for example to store context information, a callback, etc.
A selector can use various implementations (select(), poll(), epoll()...)
depending on the platform. The default `Selector` class uses the most
efficient implementation on the current platform.
Nc C s t �dS )a3 Register a file object.
Parameters:
fileobj -- file object or file descriptor
events -- events to monitor (bitwise mask of EVENT_READ|EVENT_WRITE)
data -- attached data
Returns:
SelectorKey instance
Raises:
ValueError if events is invalid
KeyError if fileobj is already registered
OSError if fileobj is closed or otherwise is unacceptable to
the underlying system call (if a system call is made)
Note:
OSError may or may not be raised
N)�NotImplementedError)r r r r r r r �register^ s zBaseSelector.registerc C s t �dS )aj Unregister a file object.
Parameters:
fileobj -- file object or file descriptor
Returns:
SelectorKey instance
Raises:
KeyError if fileobj is not registered
Note:
If fileobj is registered but has since been closed this does
*not* raise OSError (even if the wrapped syscall does)
N)r) )r r r r r �
unregisteru s zBaseSelector.unregisterc C s | j |� | j|||�S )ay Change a registered file object monitored events or attached data.
Parameters:
fileobj -- file object or file descriptor
events -- events to monitor (bitwise mask of EVENT_READ|EVENT_WRITE)
data -- attached data
Returns:
SelectorKey instance
Raises:
Anything that unregister() or register() raises
)r+ r* )r r r r r r r �modify� s
zBaseSelector.modifyc C s t �dS )aq Perform the actual selection, until some monitored file objects are
ready or a timeout expires.
Parameters:
timeout -- if timeout > 0, this specifies the maximum wait time, in
seconds
if timeout <= 0, the select() call won't block, and will
report the currently ready file objects
if timeout is None, select() will block until a monitored
file object becomes ready
Returns:
list of (key, events) for ready file objects
`events` is a bitwise mask of EVENT_READ|EVENT_WRITE
N)r) )r �timeoutr r r �select� s zBaseSelector.selectc C s dS )zmClose the selector.
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rD tdj|��d�Y nX dS )zzReturn the key associated to a registered file object.
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