old_contents: """Copyright 2009 Chris Davis
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
     http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License."""
  
  from threading import Lock
  from carbon.conf import settings
  
  
  class MetricCache(dict):
    def __init__(self):
      self.size = 0
      self.lock = Lock()
  
    def __setitem__(self, key, value):
      raise TypeError("Use store() method instead!")
  
    def store(self, metric, datapoint):
      if self.isFull():
        log.msg("MetricCache is full: self.size=%d" % self.size)
        state.events.cacheFull()
        return
  
      metric = '.'.join(part for part in metric.split('.') if part) # normalize the path
      try:
        self.lock.acquire()
        self.setdefault(metric, []).append(datapoint)
        self.size += 1
      finally:
        self.lock.release()
  
    def isFull(self):
      return self.size >= settings.MAX_CACHE_SIZE
  
    def pop(self, metric):
      try:
        self.lock.acquire()
        datapoints = dict.pop(self, metric)
        self.size -= len(datapoints)
        return datapoints
      finally:
        self.lock.release()
  
    def counts(self):
      try:
        self.lock.acquire()
        return [ (metric, len(datapoints)) for (metric, datapoints) in self.items() ]
      finally:
        self.lock.release()
  
  
  # Ghetto singleton
  MetricCache = MetricCache()
  
  
  # Avoid import circularities
  from carbon import log, state
  
new_contents: """Copyright 2009 Chris Davis
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
     http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License."""
  
  from threading import Lock
  from carbon.conf import settings
  
  
  class MetricCache(dict):
    def __init__(self):
      self.size = 0
      self.lock = Lock()
  
    def __setitem__(self, key, value):
      raise TypeError("Use store() method instead!")
  
    def store(self, metric, datapoint):
      metric = '.'.join(part for part in metric.split('.') if part) # normalize the path
      try:
        self.lock.acquire()
        self.setdefault(metric, []).append(datapoint)
        self.size += 1
      finally:
        self.lock.release()
  
      if self.isFull():
        log.msg("MetricCache is full: self.size=%d" % self.size)
        state.events.cacheFull()
  
    def isFull(self):
      return self.size >= settings.MAX_CACHE_SIZE
  
    def pop(self, metric):
      try:
        self.lock.acquire()
        datapoints = dict.pop(self, metric)
        self.size -= len(datapoints)
        return datapoints
      finally:
        self.lock.release()
  
    def counts(self):
      try:
        self.lock.acquire()
        return [ (metric, len(datapoints)) for (metric, datapoints) in self.items() ]
      finally:
        self.lock.release()
  
  
  # Ghetto singleton
  MetricCache = MetricCache()
  
  
  # Avoid import circularities
  from carbon import log, state
  
subject: fix cache full behavior in carbon cache to not drop a metric when the cache is found to be full