diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1caf713a..af1ebab5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -55,10 +55,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
- Web
- - now the environment settings are cached for 24 hours. This period can be controlled through the new settings property **environment.update_interval** (in minutes -> default: 1440 = 24 hours. Use **0** so that they are always updated).
+ - now the environment settings are cached in disk for 24 hours. This period can be controlled through the new settings property **environment.cache_exp** (in minutes -> default: 1440 = 24 hours. Use **0** so that they are always updated).
+
+ - now the suggestions are cached in disk for 24 hours. This period can be controlled through the new settings property **suggestions.cache_exp** (in hours -> default: 24 hours. Use **0** so that they are always updated).
- displaying the "Indexing suggestions" task during the initialization process
- all types now display an initialization task "Checking configuration file" responsible to create/update the respective configuration file
diff --git a/README.md b/README.md
index 70a944bb..4e8a789d 100644
--- a/README.md
+++ b/README.md
@@ -269,6 +269,9 @@ environment:
version: null # set a custom Electron version here (e.g: '6.1.4')
system: false # set it to 'true' if you want to use the nativefier version globally installed on your system
cache_exp: 1440 # defines the period (in minutes) in which the stored environment settings are considered valid. Use 0 so that they are always updated. Default: 1440 (24 hours)
+
+suggestions:
+ cache_exp: 24 # defines the period (in HOURS) in which suggestions stored on the disk are considered up to date during the initialization process. Use 0 so that they are always updated. Default: 24.
```
- Required dependencies:
- Arch-based systems: **python-lxml**, **python-beautifulsoup4**
@@ -363,6 +366,7 @@ Priority:
- Disable the application types you do not want to deal with
- If you don't care about restarting the app every time a new supported package technology is installed, enable `single_dependency_checking`. This can reduce the application response time, since it won't need to recheck if the required technologies are available on your system every time a given action is executed.
- If you don't mind to see the applications icons, you can disable them via `download: icons: false`. The application may have a slight response improvement, since it will reduce the IO and parallelism within it.
+- For a faster initialization process, consider raising the values of settings properties associated with disk caching.
### Files and Logs
- Installation logs and temporary files are saved at **/tmp/bauh** (or **/tmp/bauh_root** if you launch it as root)
diff --git a/bauh/gems/web/__init__.py b/bauh/gems/web/__init__.py
index e530425e..727c3eb5 100644
--- a/bauh/gems/web/__init__.py
+++ b/bauh/gems/web/__init__.py
@@ -3,9 +3,11 @@ from pathlib import Path
from bauh.api.constants import DESKTOP_ENTRIES_DIR, CONFIG_PATH, TEMP_DIR, CACHE_PATH
from bauh.commons import resource
+from bauh.commons.util import map_timestamp_file
ROOT_DIR = os.path.dirname(os.path.abspath(__file__))
WEB_PATH = '{}/.local/share/bauh/web'.format(Path.home())
+WEB_CACHE_PATH = '{}/web'.format(CACHE_PATH)
INSTALLED_PATH = '{}/installed'.format(WEB_PATH)
ENV_PATH = '{}/env'.format(WEB_PATH)
FIXES_PATH = '{}/fixes'.format(WEB_PATH)
@@ -26,12 +28,13 @@ URL_FIX_PATTERN = "https://raw.githubusercontent.com/vinifmor/bauh-files/master/
URL_SUGGESTIONS = "https://raw.githubusercontent.com/vinifmor/bauh-files/master/web/env/v1/suggestions.yml"
UA_CHROME = 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36'
TEMP_PATH = '{}/web'.format(TEMP_DIR)
-SEARCH_INDEX_FILE = '{}/index.yml'.format(TEMP_PATH)
-SUGGESTIONS_CACHE_FILE = '{}/suggestions.txt'.format(TEMP_PATH)
+SEARCH_INDEX_FILE = '{}/index.yml'.format(WEB_CACHE_PATH)
+SUGGESTIONS_CACHE_FILE = '{}/suggestions.yml'.format(WEB_CACHE_PATH)
+SUGGESTIONS_CACHE_TS_FILE = map_timestamp_file(SUGGESTIONS_CACHE_FILE)
CONFIG_FILE = '{}/web.yml'.format(CONFIG_PATH)
URL_NATIVEFIER = 'https://github.com/jiahaog/nativefier/archive/v{version}.tar.gz'
-ENVIRONMENT_SETTINGS_CACHED_FILE = '{}/web/environment.yml'.format(CACHE_PATH)
-ENVIRONMENT_SETTINGS_TS_FILE = '{}/web/environment.ts'.format(CACHE_PATH)
+ENVIRONMENT_SETTINGS_CACHED_FILE = '{}/environment.yml'.format(WEB_CACHE_PATH)
+ENVIRONMENT_SETTINGS_TS_FILE = '{}/environment.ts'.format(WEB_CACHE_PATH)
def get_icon_path() -> str:
diff --git a/bauh/gems/web/config.py b/bauh/gems/web/config.py
index 82ace5d1..19846c1f 100644
--- a/bauh/gems/web/config.py
+++ b/bauh/gems/web/config.py
@@ -13,5 +13,8 @@ class WebConfigManager(YAMLConfigManager):
'system': False,
'electron': {'version': None},
'cache_exp': 1440
+ },
+ 'suggestions': {
+ 'cache_exp': 24
}
}
diff --git a/bauh/gems/web/controller.py b/bauh/gems/web/controller.py
index db2ff42a..d77a00a6 100644
--- a/bauh/gems/web/controller.py
+++ b/bauh/gems/web/controller.py
@@ -830,19 +830,21 @@ class WebApplicationManager(SoftwareManager):
create_config=create_config,
i18n=self.i18n).start()
- self.suggestions_loader = SuggestionsLoader(manager=SuggestionsManager(logger=self.logger,
- http_client=self.http_client,
- i18n=self.i18n),
- logger=self.logger,
- i18n=self.i18n,
- taskman=task_manager,
- suggestions_callback=self._assign_suggestions)
- self.suggestions_loader.start()
+ self.suggestions_loader = SuggestionsLoader(manager=SuggestionsManager(logger=self.logger,
+ http_client=self.http_client,
+ i18n=self.i18n),
+ logger=self.logger,
+ i18n=self.i18n,
+ taskman=task_manager,
+ suggestions_callback=self._assign_suggestions,
+ create_config=create_config,
+ internet_connection=internet_available)
+ self.suggestions_loader.start()
- SearchIndexGenerator(taskman=task_manager,
- suggestions_loader=self.suggestions_loader,
- i18n=self.i18n,
- logger=self.logger).start()
+ SearchIndexGenerator(taskman=task_manager,
+ suggestions_loader=self.suggestions_loader,
+ i18n=self.i18n,
+ logger=self.logger).start()
def list_updates(self, internet_available: bool) -> List[PackageUpdate]:
pass
@@ -1024,8 +1026,17 @@ class WebApplicationManager(SoftwareManager):
max_width=max_width,
id_='web_cache_exp')
+ sugs_exp = TextInputComponent(label=self.i18n['web.settings.suggestions.cache_exp'],
+ tooltip=self.i18n['web.settings.suggestions.cache_exp.tip'],
+ capitalize_label=False,
+ value=int(web_config['suggestions']['cache_exp']) if isinstance(
+ web_config['suggestions']['cache_exp'], int) else '',
+ only_int=True,
+ max_width=max_width,
+ id_='web_sugs_exp')
+
form_env = FormComponent(label=self.i18n['web.settings.nativefier.env'].capitalize(),
- components=[input_electron, select_nativefier, env_settings_exp])
+ components=[input_electron, select_nativefier, env_settings_exp, sugs_exp])
return PanelComponent([form_env])
@@ -1046,6 +1057,7 @@ class WebApplicationManager(SoftwareManager):
web_config['environment']['system'] = system_nativefier
web_config['environment']['cache_exp'] = form_env.get_component('web_cache_exp').get_int_value()
+ web_config['suggestions']['cache_exp'] = form_env.get_component('web_sugs_exp').get_int_value()
try:
self.configman.save_config(web_config)
diff --git a/bauh/gems/web/resources/locale/ca b/bauh/gems/web/resources/locale/ca
index 0365d8be..afd1879f 100644
--- a/bauh/gems/web/resources/locale/ca
+++ b/bauh/gems/web/resources/locale/ca
@@ -72,6 +72,8 @@ web.settings.nativefier.env=environment
web.settings.nativefier.system.tooltip=The Nativefier version installed on your system will be used to install applications
web.settings.nativefier.system=system
web.settings.nativefier.tip=Defines which Nativefier version should be used to generate the Web applications
+web.settings.suggestions.cache_exp=Suggestions expiration
+web.settings.suggestions.cache_exp.tip=It defines the period (in HOURS) in which suggestions stored on the disk are considered up to date during the initialization process. Use 0 so that they are always updated
web.task.download_settings=Updating environment settings
web.task.search_index=Indexing suggestions
web.task.suggestions=Downloading suggestions
diff --git a/bauh/gems/web/resources/locale/en b/bauh/gems/web/resources/locale/en
index 0365d8be..18273835 100644
--- a/bauh/gems/web/resources/locale/en
+++ b/bauh/gems/web/resources/locale/en
@@ -72,6 +72,8 @@ web.settings.nativefier.env=environment
web.settings.nativefier.system.tooltip=The Nativefier version installed on your system will be used to install applications
web.settings.nativefier.system=system
web.settings.nativefier.tip=Defines which Nativefier version should be used to generate the Web applications
+web.settings.suggestions.cache_exp=Suggestions expiration
+web.settings.suggestions.cache_exp.tip=It defines the period (in HOURS) in which suggestions stored on the disk are considered up to date during the initialization process. Use 0 so that they are always updated.
web.task.download_settings=Updating environment settings
web.task.search_index=Indexing suggestions
web.task.suggestions=Downloading suggestions
diff --git a/bauh/gems/web/resources/locale/es b/bauh/gems/web/resources/locale/es
index 03e99768..954867e2 100644
--- a/bauh/gems/web/resources/locale/es
+++ b/bauh/gems/web/resources/locale/es
@@ -63,7 +63,7 @@ web.install.substatus.checking_fixes=Verificando si hay correcciones publicadas
web.install.substatus.options=Esperando las opciones de instalación
web.install.substatus.shortcut=Generando un atajo de menú
web.settings.cache_exp=Expiración de configuraciones de ambiente
-web.settings.cache_exp.tip=Define el período (en minutos) en el que las configuraciones del ambiente almacenadas se consideran válidas. Utilice 0 para que estén siempre actualizadas.
+web.settings.cache_exp.tip=Define el período (en minutos) en el que las configuraciones del ambiente almacenadas son consideradas válidas. Utilice 0 para que siempre sean actualizadas.
web.settings.electron.version.label=Versión del Electron
web.settings.electron.version.tooltip=Define una versión alternativa del Electron para renderizar las nuevas aplicaciones instaladas
web.settings.env.nativefier.system.not_installed={} parece no estar instalado en su sistema
@@ -72,6 +72,8 @@ web.settings.nativefier.env=ambiente
web.settings.nativefier.system.tooltip=Se utilizará la versión de Nativefier instalada en su sistema para instalar aplicaciones
web.settings.nativefier.system=sistema
web.settings.nativefier.tip=Define qué versión de Nativefier debe usarse para generar las aplicaciones Web
+web.settings.suggestions.cache_exp=Expiración de sugerencias
+web.settings.suggestions.cache_exp.tip=Define el período (en HORAS) en el que las sugerencias almacenadas en el disco son consideradas actualizadas durante el proceso de inicialización. Utilice 0 para que siempre sean actualizadas.
web.task.download_settings=Actualizando configuraciones de ambiente
web.task.search_index=Indexando sugerencias
web.task.suggestions=Descargando sugerencias
diff --git a/bauh/gems/web/resources/locale/fr b/bauh/gems/web/resources/locale/fr
index 5e0ea4d3..d65cef97 100644
--- a/bauh/gems/web/resources/locale/fr
+++ b/bauh/gems/web/resources/locale/fr
@@ -72,6 +72,8 @@ web.settings.nativefier.env=environnement
web.settings.nativefier.system.tooltip=La version de Nativefier installée sur votre système va être utilisée pour installer des applications
web.settings.nativefier.system=système
web.settings.nativefier.tip=Definit quelle version de Nativefier doit être utilisée pour géner les applications Web
+web.settings.suggestions.cache_exp=Suggestions expiration
+web.settings.suggestions.cache_exp.tip=It defines the period (in HOURS) in which suggestions stored on the disk are considered up to date during the initialization process. Use 0 so that they are always updated
web.task.download_settings=Mise à jour des paramètres d'environnement
web.task.search_index=Indexing suggestions
web.task.suggestions=Téléchargement de suggestions
diff --git a/bauh/gems/web/resources/locale/it b/bauh/gems/web/resources/locale/it
index 0365d8be..afd1879f 100644
--- a/bauh/gems/web/resources/locale/it
+++ b/bauh/gems/web/resources/locale/it
@@ -72,6 +72,8 @@ web.settings.nativefier.env=environment
web.settings.nativefier.system.tooltip=The Nativefier version installed on your system will be used to install applications
web.settings.nativefier.system=system
web.settings.nativefier.tip=Defines which Nativefier version should be used to generate the Web applications
+web.settings.suggestions.cache_exp=Suggestions expiration
+web.settings.suggestions.cache_exp.tip=It defines the period (in HOURS) in which suggestions stored on the disk are considered up to date during the initialization process. Use 0 so that they are always updated
web.task.download_settings=Updating environment settings
web.task.search_index=Indexing suggestions
web.task.suggestions=Downloading suggestions
diff --git a/bauh/gems/web/resources/locale/pt b/bauh/gems/web/resources/locale/pt
index 3310e350..dd66cb73 100644
--- a/bauh/gems/web/resources/locale/pt
+++ b/bauh/gems/web/resources/locale/pt
@@ -71,6 +71,8 @@ web.settings.nativefier.env=ambiente
web.settings.nativefier.system.tooltip=A versão do Nativefier instalada no seu sistema será utilizada para instalar aplicativos
web.settings.nativefier.system=sistema
web.settings.nativefier.tip=Define qual versão do Nativefier será utilizada para gerar os aplicativos Web
+web.settings.suggestions.cache_exp=Expiração de sugestões
+web.settings.suggestions.cache_exp.tip=Define o período (em HORAS) em que as sugestões armazenadas em disco são consideradas atualizadas durante a inicialização. Use 0 para que elas sejam sempre atualizadas.
web.task.download_settings=Atualizando configurações de ambiente
web.task.search_index=Indexando sugestões
web.task.suggestions=Baixando sugestões
diff --git a/bauh/gems/web/resources/locale/ru b/bauh/gems/web/resources/locale/ru
index d14ec477..e97c601f 100644
--- a/bauh/gems/web/resources/locale/ru
+++ b/bauh/gems/web/resources/locale/ru
@@ -72,6 +72,8 @@ web.settings.nativefier.env.tooltip=Будет использоваться ве
web.settings.nativefier.system=Из системы
web.settings.nativefier.system.tooltip=Будет использоваться версия Nativefier установленная в Вашей системе
web.settings.nativefier.tip=Определяет, какие Nativefier версии должны быдут использованы для установки веб-приложений
+web.settings.suggestions.cache_exp=Suggestions expiration
+web.settings.suggestions.cache_exp.tip=It defines the period (in HOURS) in which suggestions stored on the disk are considered up to date during the initialization process. Use 0 so that they are always updated
web.task.download_settings=Updating environment settings
web.task.search_index=Indexing suggestions
web.task.suggestions=Downloading suggestions
diff --git a/bauh/gems/web/resources/locale/tr b/bauh/gems/web/resources/locale/tr
index 62a4d4ad..ac8dd89f 100644
--- a/bauh/gems/web/resources/locale/tr
+++ b/bauh/gems/web/resources/locale/tr
@@ -72,6 +72,8 @@ web.settings.nativefier.env=çevre
web.settings.nativefier.system.tooltip=Sisteminizde yüklü olan Nativefier sürümü uygulamaları yüklemek için kullanılacaktır
web.settings.nativefier.system=sistem
web.settings.nativefier.tip=Web uygulamalarını oluşturmak için hangi Nativefier sürümünün kullanılması gerektiğini tanımlar
+web.settings.suggestions.cache_exp=Suggestions expiration
+web.settings.suggestions.cache_exp.tip=It defines the period (in HOURS) in which suggestions stored on the disk are considered up to date during the initialization process. Use 0 so that they are always updated
web.task.download_settings=Ortam ayarları güncelleniyor
web.task.search_index=Indexing suggestions
web.task.suggestions=Downloading suggestions
diff --git a/bauh/gems/web/suggestions.py b/bauh/gems/web/suggestions.py
index ecd0bf7f..5797958c 100644
--- a/bauh/gems/web/suggestions.py
+++ b/bauh/gems/web/suggestions.py
@@ -1,5 +1,6 @@
import os
import traceback
+from datetime import datetime, timedelta
from logging import Logger
from pathlib import Path
@@ -7,7 +8,7 @@ import requests
import yaml
from bauh.api.http import HttpClient
-from bauh.gems.web import URL_SUGGESTIONS, SUGGESTIONS_CACHE_FILE
+from bauh.gems.web import URL_SUGGESTIONS, SUGGESTIONS_CACHE_FILE, SUGGESTIONS_CACHE_TS_FILE
from bauh.view.util.translation import I18n
@@ -18,6 +19,68 @@ class SuggestionsManager:
self.logger = logger
self.i18n = i18n
+ def should_download(self, web_config: dict) -> bool:
+ exp = web_config['suggestions']['cache_exp']
+ if web_config['suggestions']['cache_exp'] is None:
+ self.logger.info("No cache expiration defined for suggestions")
+ return True
+
+ try:
+ exp = int(exp)
+ except ValueError:
+ self.logger.error("Error while parsing the 'suggestions.cache_exp' ({}) settings property".format(exp))
+ return True
+
+ if exp <= 0:
+ self.logger.info("No cache expiration defined for suggestions ({})".format(exp))
+ return True
+
+ if not os.path.exists(SUGGESTIONS_CACHE_FILE):
+ self.logger.info("No suggestions cached file found '{}'".format(SUGGESTIONS_CACHE_FILE))
+ return True
+
+ if not os.path.exists(SUGGESTIONS_CACHE_TS_FILE):
+ self.logger.info("No suggestions cache file timestamp found '{}'".format(SUGGESTIONS_CACHE_TS_FILE))
+ return True
+
+ with open(SUGGESTIONS_CACHE_TS_FILE) as f:
+ timestamp_str = f.read()
+
+ try:
+ sugs_timestamp = datetime.fromtimestamp(float(timestamp_str))
+ except:
+ self.logger.error("Could not parse the cached suggestions file timestamp: {}".format(timestamp_str))
+ return True
+
+ expired = sugs_timestamp + timedelta(days=exp) <= datetime.utcnow()
+
+ if expired:
+ self.logger.info("Cached suggestions file has expired.")
+ return True
+ else:
+ self.logger.info("Cached suggestions file is up to date")
+ return False
+
+ def read_cached(self, check_file: bool = True) -> dict:
+ if check_file and not os.path.exists(SUGGESTIONS_CACHE_FILE):
+ self.logger.warning("Cached suggestions file does not exist ({})".format(SUGGESTIONS_CACHE_FILE))
+ return {}
+
+ self.logger.info("Reading cached suggestions file '{}'".format(SUGGESTIONS_CACHE_FILE))
+ with open(SUGGESTIONS_CACHE_FILE) as f:
+ sugs_str = f.read()
+
+ if not sugs_str:
+ self.logger.warning("Cached suggestions file '{}' is empty".format(SUGGESTIONS_CACHE_FILE))
+ return {}
+
+ try:
+ return yaml.safe_load(sugs_str)
+ except:
+ self.logger.error("An unexpected exception happened")
+ traceback.print_exc()
+ return {}
+
def download(self) -> dict:
self.logger.info("Reading suggestions from {}".format(URL_SUGGESTIONS))
try:
@@ -35,7 +98,7 @@ class SuggestionsManager:
self.logger.info("Finished")
return suggestions
- def save_to_disk(self, suggestions: dict):
+ def save_to_disk(self, suggestions: dict, timestamp: float):
if not suggestions:
return
@@ -51,9 +114,19 @@ class SuggestionsManager:
try:
with open(SUGGESTIONS_CACHE_FILE, 'w+') as f:
f.write(yaml.safe_dump(suggestions))
-
- self.logger.info("{} suggestions successfully cached to file '{}'".format(len(suggestions), SUGGESTIONS_CACHE_FILE))
except:
self.logger.error("Could write to {}".format(SUGGESTIONS_CACHE_FILE))
traceback.print_exc()
return
+
+ self.logger.info("{} suggestions successfully cached to file '{}'".format(len(suggestions), SUGGESTIONS_CACHE_FILE))
+
+ try:
+ with open(SUGGESTIONS_CACHE_TS_FILE, 'w+') as f:
+ f.write(str(timestamp))
+ except:
+ self.logger.error("Could not write to {}".format(SUGGESTIONS_CACHE_TS_FILE))
+ traceback.print_exc()
+ return
+
+ self.logger.info("Suggestions cached file timestamp ({}) successfully saved at '{}'".format(timestamp, SUGGESTIONS_CACHE_TS_FILE))
diff --git a/bauh/gems/web/worker.py b/bauh/gems/web/worker.py
index a96c9cea..91b86f94 100644
--- a/bauh/gems/web/worker.py
+++ b/bauh/gems/web/worker.py
@@ -1,6 +1,7 @@
import logging
import time
import traceback
+from datetime import datetime
from threading import Thread
from typing import Optional
@@ -18,7 +19,8 @@ from bauh.view.util.translation import I18n
class SuggestionsLoader(Thread):
def __init__(self, taskman: TaskManager, manager: SuggestionsManager,
- i18n: I18n, logger: logging.Logger, suggestions_callback, suggestions: Optional[dict] = None):
+ i18n: I18n, logger: logging.Logger, suggestions_callback, create_config: CreateConfigFile,
+ internet_connection: bool, suggestions: Optional[dict] = None):
super(SuggestionsLoader, self).__init__(daemon=True)
self.taskman = taskman
self.task_id = 'web_sugs'
@@ -27,30 +29,47 @@ class SuggestionsLoader(Thread):
self.i18n = i18n
self.logger = logger
self.suggestions = suggestions
+ self.create_config = create_config
+ self.internet_connection = internet_connection
self.task_name = self.i18n['web.task.suggestions']
self.taskman.register_task(self.task_id, self.task_name, get_icon_path())
def run(self):
ti = time.time()
+ self.taskman.update_progress(self.task_id, 0, self.i18n['task.waiting_task'].format(bold(self.create_config.task_name)))
+ self.create_config.join()
+
self.taskman.update_progress(self.task_id, 10, None)
- try:
- self.suggestions = self.manager.download()
- if self.suggestions_callback:
+ if not self.internet_connection:
+ self.logger.warning("No internet connection. Only cached suggestions can be loaded")
+ self.suggestions = self.manager.read_cached(check_file=True)
+ elif not self.manager.should_download(self.create_config.config):
+ self.suggestions = self.manager.read_cached(check_file=False)
+ else:
+ try:
+ timestamp = datetime.utcnow().timestamp()
+ self.suggestions = self.manager.download()
+
+ if self.suggestions:
+ self.taskman.update_progress(self.task_id, 50, self.i18n['web.task.suggestions.saving'])
+ self.manager.save_to_disk(self.suggestions, timestamp)
+ except:
+ self.logger.error("Unexpected exception")
+ traceback.print_exc()
+
+ if self.suggestions_callback:
+ self.taskman.update_progress(self.task_id, 75, None)
+ try:
self.suggestions_callback(self.suggestions)
+ except:
+ self.logger.error("Unexpected exception")
+ traceback.print_exc()
- if self.suggestions:
- self.taskman.update_progress(self.task_id, 50, self.i18n['web.task.suggestions.saving'])
- self.manager.save_to_disk(self.suggestions)
-
- except:
- self.logger.error("Unexpected exception")
- traceback.print_exc()
- finally:
- self.taskman.update_progress(self.task_id, 100, None)
- self.taskman.finish_task(self.task_id)
- tf = time.time()
- self.logger.info("Finished. Took {0:.2f} seconds".format(tf - ti))
+ self.taskman.update_progress(self.task_id, 100, None)
+ self.taskman.finish_task(self.task_id)
+ tf = time.time()
+ self.logger.info("Finished. Took {0:.2f} seconds".format(tf - ti))
class SearchIndexGenerator(Thread):