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from threading import RLock
from typing import Any, List
from reactivex import abc
class CompositeDisposable(abc.DisposableBase):
"""Represents a group of disposable resources that are disposed
together"""
def __init__(self, *args: Any):
if args and isinstance(args[0], list):
self.disposable: List[abc.DisposableBase] = args[0]
else:
self.disposable = list(args)
self.is_disposed = False
self.lock = RLock()
super(CompositeDisposable, self).__init__()
def add(self, item: abc.DisposableBase) -> None:
"""Adds a disposable to the CompositeDisposable or disposes the
disposable if the CompositeDisposable is disposed
Args:
item: Disposable to add."""
should_dispose = False
with self.lock:
if self.is_disposed:
should_dispose = True
else:
self.disposable.append(item)
if should_dispose:
item.dispose()
def remove(self, item: abc.DisposableBase) -> bool:
"""Removes and disposes the first occurrence of a disposable
from the CompositeDisposable."""
if self.is_disposed:
return False
should_dispose = False
with self.lock:
if item in self.disposable:
self.disposable.remove(item)
should_dispose = True
if should_dispose:
item.dispose()
return should_dispose
def dispose(self) -> None:
"""Disposes all disposable in the group and removes them from
the group."""
if self.is_disposed:
return
with self.lock:
self.is_disposed = True
current_disposable = self.disposable
self.disposable = []
for disp in current_disposable:
disp.dispose()
def clear(self) -> None:
"""Removes and disposes all disposable from the
CompositeDisposable, but does not dispose the
CompositeDisposable."""
with self.lock:
current_disposable = self.disposable
self.disposable = []
for disposable in current_disposable:
disposable.dispose()
def contains(self, item: abc.DisposableBase) -> bool:
"""Determines whether the CompositeDisposable contains a specific
disposable.
Args:
item: Disposable to search for
Returns:
True if the disposable was found; otherwise, False"""
return item in self.disposable
def to_list(self) -> List[abc.DisposableBase]:
return self.disposable[:]
def __len__(self) -> int:
return len(self.disposable)
@property
def length(self) -> int:
return len(self.disposable)
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