### Install QuasiQueue

Source: https://github.com/tedivm/quasiqueue/blob/main/README.md

Provides the command to install the QuasiQueue library using pip.

```bash
pip install quasiqueue

```

--------------------------------

### Python QuasiQueue Basic Example

Source: https://github.com/tedivm/quasiqueue/blob/main/README.md

Demonstrates the basic usage of QuasiQueue by defining asynchronous writer and reader functions and initializing the QuasiQueue with a name and these functions. The example shows how to run the queue using asyncio.

```python
import asyncio

from quasiqueue import QuasiQueue


async def writer(desired: int):
  """Feeds data to the Queue when it is low.
  """
  for x in range(0, desired):
    yield x



async def reader(identifier: int|str):
  """Receives individual items from the queue.

  Args:
      identifier (int | str): Comes from the output of the Writer function
  """
  print(f"{identifier}")


runner = QuasiQueue(
  "hello_world",
  reader=reader,
  writer=writer,
)

if __name__ == '__main__':
  asyncio.run(runner.main())

```

--------------------------------

### Python Reader Function Example

Source: https://github.com/tedivm/quasiqueue/blob/main/README.md

Illustrates a simple asynchronous reader function for QuasiQueue, showing how it receives an identifier from the writer and prints it. This function can be synchronous or asynchronous.

```python
async def reader(identifier: int|str):
  """Receives individual items from the queue.

  Args:
      identifier (int | str): Comes from the output of the Writer function
  """
  print(f"{identifier}")

```

--------------------------------

### Initialize QuasiQueue with Overridden Settings

Source: https://github.com/tedivm/quasiqueue/blob/main/README.md

Demonstrates initializing QuasiQueue with a Settings object, overriding default values like lookup_block_size. Note that environment variable prefixes are lost when using this method directly.

```python
from quasiqueue import Settings, QuasiQueue

QuasiQueue(
  "MyQueue",
  reader=reader,
  writer=writer,
  settings=Settings(lookup_block_size=50)
)
```

--------------------------------

### Extend Settings Class with Custom Prefix

Source: https://github.com/tedivm/quasiqueue/blob/main/README.md

Shows how to extend the base Settings class to define a custom environment variable prefix (e.g., MY_QUEUE_) and add custom fields. This allows for more organized configuration management.

```python
from quasiqueue import Settings, QuasiQueue
from pydantic_settings import SettingsConfigDict

class MySettings(Settings)
  model_config = SettingsConfigDict(env_prefix="MY_QUEUE_")
  lookup_block_size: int = 50

QuasiQueue(
  "MyQueue",
  reader=reader,
  writer=writer,
  settings=MySettings()
)
```

--------------------------------

### QuasiQueue Context and Reader Functions

Source: https://github.com/tedivm/quasiqueue/blob/main/README.md

The optional context function runs once to initialize resources like database or HTTP connection pools. It should return a dictionary, which is then passed to the reader function. The reader function processes individual items from the queue, utilizing the provided context for operations.

```Python
def context():
  ctx = {}
  ctx['http'] = get_http_connection_pool()
  ctx['dbengine'] = get_db_engine_pool()
  return ctx

def reader(identifier: int|str, ctx: Dict[str, Any]):
  """Receives individual items from the queue.

  Args:
      identifier (int | str): Comes from the output of the Writer function
      ctx (Dict[str, Any]): Comes from the output of the Context function
  """
  ctx['dbengine'].execute("get item")
  ctx['http'].get("url")
  print(f"{identifier}")


runner = QuasiQueue(
  "hello_world",
  reader=reader,
  writer=writer,
  context=context
)
```

--------------------------------

### Access QuasiQueue Settings in Reader Function

Source: https://github.com/tedivm/quasiqueue/blob/main/README.md

Illustrates how to access the QuasiQueue settings within a reader function by defining a 'settings' argument. This allows functions to utilize configuration parameters like 'project_name'.

```python
async def reader(item: Any, settings: Dict[str, Any])
  print(settings['project_name'])
```

--------------------------------

### QuasiQueue Writer Function

Source: https://github.com/tedivm/quasiqueue/blob/main/README.md

The writer function is responsible for feeding data to the QuasiQueue when the queue is low. It should return an iterator of picklable items. Generators are recommended for memory efficiency. The function is asynchronous and accepts the desired number of items as an argument, which can be used for optimization.

```Python
async def writer(desired: int):
  """Feeds data to the Queue when it is low.
  """
  return range(0, desired)
```

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