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How to use cache_lock method in avocado

Best Python code snippet using avocado_python

distributed_cache.py

Source:distributed_cache.py

1#!/usr/bin/env python2# -*- encoding: utf-8 -*-3from typing import Optional, Dict, Union, List4from dask.distributed import Client, Variable, Lock, ActorFuture, TimeoutError5from src.kv_cache import KVGraphCache, KVCacheValueType6class DistributedCache:7    def __init__(self, config: Optional[Dict[str, Union[str, bool]]], dask_client=None):8        """9        Class that implements a simple distributed key value cache that takes care of persisting and restoring to database10        :param config: keys required:\n11                                db_username: the username to login to db with12                                db_system: the db type - arango-db13                                db_name: the name of the database14                                db_config_file_path: the path with the database configuration15                                db_queries_file_path: the path with the query definitions16                                named_query_collection - postfix for a store's named query collection17                                scheduler_address - the address of the Dask Cluster Scheduler18        """19        self.config = config20        if dask_client is None:21            self.client = Client(config['scheduler_address'])22        else:23            self.client = dask_client24    @staticmethod25    def lock_store(store_name: str) -> Lock:26        """27        method to create a distributed lock on a complete store28        :param store_name: the store to lock29        :return: lock object to use within a with statement30        """31        distributed_store_name = 'KVCache:{}'.format(store_name)32        return Lock(distributed_store_name)33    @staticmethod34    def lock_key(store_name: str, key: str) -> Lock:35        """36        method to create a distributed lock on a key within a store37        :param store_name: the store to lock38        :param key: the key in the store to lock39        :return: lock object to use within a with statement40        """41        distributed_store_name_key = 'KVCache:{}:{}'.format(store_name, key)42        return Lock(distributed_store_name_key)43    def create_distributed_store(self, store_name: str, key: Optional[Union[List[str], str]] = None, restore: bool = True):44        """45        method to initialise a store and restore46        :param store_name: the store_name47        :param key: a key or list of keys to restore48        :param restore: If true then restore from database49        :return: True if restored else false50        """51        store_lock = self.lock_store(store_name=store_name)52        store_lock.acquire()53        # create a distributed variable with the kv_cache object54        #55        distributed_store_name = 'KVCache_{}'.format(store_name)56        # flag indicating if restored from DB57        #58        result = False59        try:60            # try to get the cache61            #62            Variable(distributed_store_name).get(timeout=0.1)63        except TimeoutError:64            # the distributed variable does not exist so create it65            #66            cache_future = self.client.submit(KVGraphCache, self.config, actor=True)67            # create the distributed variable and store the new cache actor68            #69            Variable(distributed_store_name).set(cache_future)70            # only restore if not in cache and asked to71            #72            if restore:73                cache = cache_future.result()74                cache.restore(store_name=store_name, key=key, include_history=False)75                result = True76        store_lock.release()77        return result78    def set_kv(self, store_name: str, key: str, value: KVCacheValueType, set_update_flag: bool = True, persist: bool = True, keep_cache: bool = True, lock_cache: bool = True) -> ActorFuture:79        """80        method to add a key value pair to a store. If key already exists then will overwrite81        :param store_name: the store name82        :param key: the unique key within the store83        :param value: the data to save84        :param set_update_flag: If true then the update flag will be set85        :param persist: If true the changes will be persisted in database86        :param lock_cache: If True the cache will be locked before accessing. If False it assumes a lock has already been acquired87        :param keep_cache: If False then cache will be deleted after being persisted88        :return: ActorFuture with True if success else False89        """90        distributed_store_name = 'KVCache_{}'.format(store_name)91        try:92            dist_cache_var = Variable(distributed_store_name).get(timeout=0.1)93            cache = dist_cache_var.result()94            if lock_cache:95                cache_lock = self.lock_key(store_name=store_name, key=key)96                cache_lock.acquire()97            else:98                cache_lock = None99            result = cache.set_kv(store_name=store_name, key=key, value=value, set_update_flag=set_update_flag)100            if persist:101                result = cache.persist(store_name=store_name, keep_cache=keep_cache)102            if cache_lock is not None:103                cache_lock.release()104        except TimeoutError:105            result = None106        return result107    def del_kv(self, store_name: str, key: Optional[str] = None, persist=True, lock_cache: bool = True) -> ActorFuture:108        """109        method to delete a key within a store or the whole store. If the store/key has been persisted then the delete will be propagated when persist() is called110        :param store_name: the store name111        :param key: the key to delete112        :param persist: If true the changes will be persisted in database113        :param lock_cache: If True the cache will be locked before accessing. If False it assumes a lock has already been acquired114        :return: ActorFuture with True if success else False115        """116        distributed_store_name = 'KVCache_{}'.format(store_name)117        try:118            dist_cache_var = Variable(distributed_store_name).get(timeout=0.1)119            cache = dist_cache_var.result()120            if lock_cache:121                cache_lock = self.lock_key(store_name=store_name, key=key)122                cache_lock.acquire()123            else:124                cache_lock = None125            result = cache.del_kv(store_name=store_name, key=key, delete_from_db=persist)126            if persist:127                result = cache.persist(store_name=store_name)128            if cache_lock is not None:129                cache_lock.release()130        except TimeoutError:131            result = None132        return result133    def get_kv(self, store_name: str, key: Optional[str] = None, lock_cache: bool = True) -> ActorFuture:134        """135        method to retrieve a stored value136        :param store_name: the store name137        :param key: the key within the store138        :param lock_cache: If True the cache will be locked before accessing. If False it assumes a lock has already been acquired139        :return: ActorFuture with either KVCacheValueType or None if it doesnt exist140        """141        distributed_store_name = 'KVCache_{}'.format(store_name)142        try:143            dist_cache_var = Variable(distributed_store_name).get(timeout=0.1)144            cache = dist_cache_var.result()145            if lock_cache:146                cache_lock = self.lock_key(store_name=store_name, key=key)147                cache_lock.acquire()148            else:149                cache_lock = None150            result = cache.get_kv(store_name=store_name, key=key)151            if cache_lock is not None:152                cache_lock.release()153        except TimeoutError:154            result = None155        return result156    def restore(self, store_name, include_history: bool = False, lock_cache: bool = True) -> bool:157        """158        method to restore a store_name and optionally specific key159        :param store_name: the store_name to restore160        :param include_history: If True restore all history161        :param lock_cache: If True the cache will be locked before accessing. If False it assumes a lock has already been acquired162        :return: ActorFuture with True if restored else False163        """164        distributed_store_name = 'KVCache_{}'.format(store_name)165        try:166            dist_cache_var = Variable(distributed_store_name).get(timeout=0.1)167            cache = dist_cache_var.result()168            if lock_cache:169                cache_lock = self.lock_store(store_name=store_name)170                cache_lock.acquire()171            else:172                cache_lock = None173            result = cache.restore(store_name=store_name, include_history=include_history)174            if cache_lock is not None:175                cache_lock.release()176        except TimeoutError:177            result = None...

cache.py

Source:cache.py

1from threading import Lock2import time3cache_lock = Lock()4encounter_cache = {}5def get_cached_count():6    return len(encounter_cache)7def get_cached_encounter(encounter_id):8    return encounter_cache.get(encounter_id, False)9def cache_encounter(encounter_id, encounter_data):10    cache_lock.acquire()11    encounter_cache[encounter_id] = encounter_data12    cache_lock.release()13def cleanup_cache():14    # Remove all entries from encounter cache older than 1 hour.15    now = time.time()16    cache_lock.acquire()17    num_deleted = 018    for encounter_id in encounter_cache.keys():19        encounter = encounter_cache[encounter_id]20        if now - encounter['encountered_time'] > 60 * 60:21            del encounter_cache[encounter_id]22            num_deleted += 123    cache_lock.release()...

ledger.py

Source:ledger.py

1from tools.threads.readwritelock import ReadWriteLock234class Ledger:5    def __init__(self, update_trigger, ledger_source):6        self.ledger_source = ledger_source7        self.update_trigger = update_trigger8        self.cache = {}910        self.update_trigger.subscribe(self.update)11        self.update_trigger.prime()1213        self.cache_lock = ReadWriteLock()1415    def update(self):1617        data = self.ledger_source.pull()1819        self.cache_lock.acquire_write()20        self.cache = data21        self.cache_lock.release_write()2223    def get(self):2425        self.cache_lock.acquire_read()26        data = self.cache27        self.cache_lock.release_read()28
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