Package org.apache.iotdb.confignode.conf

Class SystemPropertiesUtils

java.lang.Object

org.apache.iotdb.confignode.conf.SystemPropertiesUtils

public class SystemPropertiesUtils
extends Object

Method Summary

Modifier and Type	Method	Description
static void	checkSystemProperties()	Check whether system parameters are consistent during each restart.
static boolean	isRestarted()	Check if the ConfigNode is restarted.
static boolean	isSeedConfigNode()	Check if the current ConfigNode is SeedConfigNode.
static int	loadConfigNodeIdWhenRestarted()	Load the config_node_id in confignode-system.properties file.
static List<TConfigNodeLocation>	loadConfigNodeList()	Load the config_node_list in confignode-system.properties file.
static void	reinitializeStatics()
static void	storeConfigNodeList(List<TConfigNodeLocation> configNodes)	Store the latest config_node_list in confignode-system.properties file
static void	storeSystemParameters()	The system parameters can't be changed after the ConfigNode first started.

Methods inherited from class java.lang.Object

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

Method Details

reinitializeStatics

public static void reinitializeStatics()

isRestarted

public static boolean isRestarted()

Check if the ConfigNode is restarted.

Returns:

True if confignode-system.properties file exist.

checkSystemProperties

public static void checkSystemProperties()
                                  throws IOException

Check whether system parameters are consistent during each restart. We only invoke this interface when restarted.

Throws:

IOException - When read the confignode-system.properties file failed

loadConfigNodeList

public static List<TConfigNodeLocation> loadConfigNodeList()
                                                    throws IOException,
BadNodeUrlException

Load the config_node_list in confignode-system.properties file. We only invoke this interface when restarted.

Returns:

The property of config_node_list in confignode-system.properties file

Throws:

IOException - When load confignode-system.properties file failed

BadNodeUrlException - When parsing config_node_list failed

storeSystemParameters

public static void storeSystemParameters()
                                  throws IOException

The system parameters can't be changed after the ConfigNode first started. Therefore, store them in confignode-system.properties during the first startup.

Throws:

IOException - systemPropertiesHandler.read()

storeConfigNodeList

public static void storeConfigNodeList(List<TConfigNodeLocation> configNodes)
                                throws IOException

Store the latest config_node_list in confignode-system.properties file

Parameters:

configNodes - The latest ConfigNodeList

Throws:

IOException - When store confignode-system.properties file failed

loadConfigNodeIdWhenRestarted

public static int loadConfigNodeIdWhenRestarted()
                                         throws IOException

Load the config_node_id in confignode-system.properties file. We only invoke this interface when restarted.

Returns:

The property of config_node_id in confignode-system.properties file

Throws:

IOException - When load confignode-system.properties file failed

isSeedConfigNode

public static boolean isSeedConfigNode()

Check if the current ConfigNode is SeedConfigNode.

Notice: Only invoke this interface when restarted.

Returns:

True if the is_seed_config_node is set to True in iotdb-confignode.properties file