Module net.morimekta.config

Package net.morimekta.config

Class ConfigWatcher<ConfigFileType>

java.lang.Object

net.morimekta.config.ConfigWatcher<ConfigFileType>

All Implemented Interfaces:

Closeable, AutoCloseable

public class ConfigWatcher<ConfigFileType>
extends Object
implements Closeable

The config watcher watches the whole directory of config files of the same type, and notifies listeners of any changes. The purpose of this watcher is to manage config files serving different entities of the same type, where the entity config for each can change live, be created and removed.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ConfigWatcher.ConfigEntry<ConfigFileType>	A config file entry cached in the watcher.

Constructor Summary

Constructors

Constructor	Description
ConfigWatcher(Path configDir, ConfigReader<ConfigFileType> configReader, Function<ConfigFileType,String> configIdentifier)	Create a config watcher instance.
ConfigWatcher(Path configDir, ConfigReader<ConfigFileType> configReader, Function<ConfigFileType,String> configIdentifier, Clock clock)	Create a config watcher instance.
ConfigWatcher(Path configDir, ConfigReader<ConfigFileType> configReader, Function<ConfigFileType,String> configIdentifier, Clock clock, net.morimekta.file.DirWatcher dirWatcher, net.morimekta.file.FileWatcher fileWatcher)	Create a config watcher instance.

Method Summary

Modifier and Type	Method	Description
ConfigWatcher<ConfigFileType>	addChangeListener(ConfigChangeListener<ConfigFileType> listener)	Add a config change listener for notification on changes to the loaded config map.
ConfigWatcher<ConfigFileType>	addEventListener(ConfigEventListener listener)	Add a config event listener for events of what is happening on the config watcher.
void	close()	Immediately remove all change listeners and stop watching files.
Path	getConfigDir()
Map<Path,ConfigWatcher.ConfigEntry<ConfigFileType>>	getLoadedConfigMap()
ConfigWatcher<ConfigFileType>	start()	Start the NetworkConfigWatcher and throw exception if unable to read and update config.
ConfigWatcher<ConfigFileType>	start(boolean failOnConfigException)	Start the NetworkConfigWatcher and throw exception if unable to read and update config.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

ConfigWatcher

public ConfigWatcher(Path configDir,
 ConfigReader<ConfigFileType> configReader,
 Function<ConfigFileType,String> configIdentifier)

Create a config watcher instance.

Parameters:

configDir - The directory where the config files should be.

configReader - The config file reader used for parsing.

configIdentifier - Get identifiers from the config file for metrics and logging.

ConfigWatcher

public ConfigWatcher(Path configDir,
 ConfigReader<ConfigFileType> configReader,
 Function<ConfigFileType,String> configIdentifier,
 Clock clock)

Create a config watcher instance.

Parameters:

configDir - The directory where the config files should be.

configReader - The config file reader used for parsing.

configIdentifier - Get identifiers from the config file for metrics and logging.

clock - Clock for knowing config update times.

ConfigWatcher

public ConfigWatcher(Path configDir,
 ConfigReader<ConfigFileType> configReader,
 Function<ConfigFileType,String> configIdentifier,
 Clock clock,
 net.morimekta.file.DirWatcher dirWatcher,
 net.morimekta.file.FileWatcher fileWatcher)

Create a config watcher instance.

Parameters:

configDir - The directory where the config files should be.

configReader - The config file reader used for parsing.

configIdentifier - Get identifiers from the config file for metrics and logging.

clock - Clock for knowing config update times.

dirWatcher - A directory watcher.

fileWatcher - A file watcher.

Method Details

getConfigDir

public Path getConfigDir()

Returns:

The path to the config directory.

getLoadedConfigMap

public Map<Path,ConfigWatcher.ConfigEntry<ConfigFileType>> getLoadedConfigMap()

Returns:

The currently loaded config map as map of absolute file path to loaded config entry with metadata.

addEventListener

public ConfigWatcher<ConfigFileType> addEventListener(ConfigEventListener listener)

Add a config event listener for events of what is happening on the config watcher.

Parameters:

listener - Config Event Listener

Returns:

The config watcher.

addChangeListener

public ConfigWatcher<ConfigFileType> addChangeListener(ConfigChangeListener<ConfigFileType> listener)

Add a config change listener for notification on changes to the loaded config map.

Parameters:

listener - Config Event Listener

Returns:

The config watcher.

start

public ConfigWatcher<ConfigFileType> start()
                                    throws ConfigException

Start the NetworkConfigWatcher and throw exception if unable to read and update config.

Returns:

The config watcher.

Throws:

ConfigException - On any config read, parse or update issues.

start

public ConfigWatcher<ConfigFileType> start(boolean failOnConfigException)
                                    throws ConfigException

Start the NetworkConfigWatcher and throw exception if unable to read and update config.

Parameters:

failOnConfigException - If the start sequence should fail on config exception. If this is set to false, config exceptions will be logged, but otherwise ignored.

Returns:

The config watcher.

Throws:

ConfigException - On any config read, parse or update issues.

close

public void close()

Immediately remove all change listeners and stop watching files.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

toString

public String toString()

Overrides:

toString in class Object