Source code for africanus.util.code

# -*- coding: utf-8 -*-

from functools import wraps

    from dask.utils import SerializableLock as Lock
except ImportError:
    from threading import Lock

class SingletonMixin(object):
    __singleton_lock = Lock()
    __singleton_instance = None

    def instance(cls):
        if not cls.__singleton_instance:
            with cls.__singleton_lock:
                if not cls.__singleton_instance:
                    cls.__singleton_instance = cls()

        return cls.__singleton_instance

[docs]def format_code(code): """ Formats some code with line numbers Parameters ---------- code : str Code Returns ------- str Code prefixed with line numbers """ lines = [''] lines.extend(["%-5d %s" % (i, l) for i, l in enumerate(code.split('\n'), 1)]) return '\n'.join(lines)
[docs]class memoize_on_key(object): """ Memoize based on a key function supplied by the user. The key function should return a custom key for memoizing the decorated function, based on the arguments passed to it. In the following example, the arguments required to generate the `_generate_phase_delay_kernel` function are the types of the `lm`, `uvw` and `frequency` arrays, as well as the number of correlations, `ncorr`. The supplied ``key_fn`` produces a unique key based on these types and the number of correlations, which is used to cache the generated function. .. code-block:: python def key_fn(lm, uvw, frequency, ncorrs=4): ''' Produce a unique key for the arguments of _generate_phase_delay_kernel ''' return (lm.dtype, uvw.dtype, frequency.dtype, ncorrs) _code_template = jinja2.Template(''' #define ncorrs {{ncorrs}} __global__ void phase_delay( const {{lm_type}} * lm, const {{uvw_type}} * uvw, const {{freq_type}} * frequency, {{out_type}} * out) { ... } ''') _type_map = { np.float32: 'float', np.float64: 'double' } @memoize_on_key(key_fn) def _generate_phase_delay_kernel(lm, uvw, frequency, ncorrs=4): ''' Generate the phase delay kernel ''' out_dtype = np.result_type(lm.dtype, uvw.dtype, frequency.dtype) code = _code_template.render(lm_type=_type_map[lm.dtype], uvw_type=_type_map[uvw.dtype], freq_type=_type_map[frequency.dtype], ncorrs=ncorrs) return cp.RawKernel(code, "phase_delay") """ def __init__(self, key_fn): self._key_fn = key_fn self._lock = Lock() self._cache = {} def __call__(self, fn): @wraps(fn) def wrapper(*args, **kwargs): key = self._key_fn(*args, **kwargs) with self._lock: try: return self._cache[key] except KeyError: self._cache[key] = entry = fn(*args, **kwargs) return entry return wrapper