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simplistic dependency injection container for python

Project description

# Simple Inversion-Of-Control-Container for python #

This package contains a simple inversion-of-control container. Every injectable element is registered
to the ServiceRegistry. By convention, the class' name with the first letter uncapitalized is used
(UserService -> userService).

## Features ##

* lazy initialization of services (if not registered as object)
* dependency cycle detection

An example:


```python

class Service(object):

# this will make the service registry inject a service named "someOtherService" which
# comes from class SomeOtherService
_someOtherService = None

def __init__(self):
pass

# will be called after everything is injected
def postInit(self):
pass

# will be called right before the object is destroyed (the registry's destroy
# method is called)
def preDestroy(self):
pass



class SomeOtherService(object):
pass

# Use it like

reg = ServiceRegistry()
reg.registerService(Service)
reg.registerService(SomeOtherService)

```

Once the system has all required services registered, a service can be injected by doing

```python

class WiredUser(object):

_service=None

def __init__(self, *args):
pass

wiredUser = reg.createWired(WiredUser, 'arg1', 'arg2')


```

Wired objects are not automatically part of the service registry, only if added by calling `reg.registerServiceInstance`.
They can also wire new objects on the fly:

```python

class WiredUser(object):
_service=None

...

class UserCreator(object):
_serviceRegistry=None

def createUser(self):
return self._serviceRegistry.createWired(WiredUser)

userCreator = reg.createWired(UserCreator)

# create some wired users
userA = userCreator.createUser()
userB = userCreator.createUser()
```

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