class twisted.spread.util.FilePager(Pager): (source)
Implements interfaces: twisted.internet.interfaces.IConsumer
Reads a file in chunks and sends the chunks as they come.
| Method | __init__ | Create a pager with a Reference to a remote collector and an optional callable to invoke upon completion. |
| Instance Variable | chunks | Undocumented |
| Method | startProducing | Undocumented |
| Instance Variable | deferred | Undocumented |
| Method | registerProducer | Register to receive data from a producer. |
| Instance Variable | producer | Undocumented |
| Method | unregisterProducer | Stop consuming data from a producer, without disconnecting. |
| Method | write | The producer will write data by calling this method. |
| Method | sendNextPage | Get the first chunk read and send it to collector. |
Inherited from Pager:
| Instance Variable | callback | Undocumented |
| Instance Variable | callbackArgs | Undocumented |
| Instance Variable | callbackKeyword | Undocumented |
| Instance Variable | collector | Undocumented |
| Method | stillPaging | (internal) Method called by Broker. |
| Method | nextPage | Override this to return an object to be sent to my collector. |
| Method | stopPaging | Call this when you're done paging. |
| Instance Variable | _stillPaging | Undocumented |
Create a pager with a Reference to a remote collector and an optional callable to invoke upon completion.
Register to receive data from a producer.
This sets self to be a consumer for a producer. When this object runs out of data (as when a send(2) call on a socket succeeds in moving the last data from a userspace buffer into a kernelspace buffer), it will ask the producer to resumeProducing().
For IPullProducer providers, resumeProducing will be called once each time data is required.
For IPushProducer providers, pauseProducing will be called whenever the write buffer fills up and resumeProducing will only be called when it empties. The consumer will only call resumeProducing to balance a previous pauseProducing call; the producer is assumed to start in an un-paused state.
| Parameters | producer | Undocumented |
| streaming | True if producer provides IPushProducer, False if producer provides IPullProducer. | |
| Raises | RuntimeError | If a producer is already registered. |
The producer will write data by calling this method.
The implementation must be non-blocking and perform whatever buffering is necessary. If the producer has provided enough data for now and it is a IPushProducer, the consumer may call its pauseProducing method.
Get the first chunk read and send it to collector.