Kafka metrics java port. No reporters or instrumentation.

There is no straight translation for the JMX reporter into python,
so I'll do something else in a separate commit.

1 files changed, 27 insertions, 0 deletions

diff --git a/kafka/metrics/measurable.py b/kafka/metrics/measurable.py
new file mode 100644
index 0000000..ef096f3
--- /dev/null
+++ b/kafka/metrics/measurable.py
@@ -0,0 +1,27 @@
+import abc
+
+
+class AbstractMeasurable(object):
+    """A measurable quantity that can be registered as a metric"""
+    @abc.abstractmethod
+    def measure(self, config, now):
+        """
+        Measure this quantity and return the result
+
+        Arguments:
+            config (MetricConfig): The configuration for this metric
+            now (int): The POSIX time in milliseconds the measurement
+                is being taken
+
+        Returns:
+            The measured value
+        """
+        raise NotImplementedError
+
+
+class AnonMeasurable(AbstractMeasurable):
+    def __init__(self, measure_fn):
+        self._measure_fn = measure_fn
+
+    def measure(self, config, now):
+        return float(self._measure_fn(config, now))