A singleton for managing application settings applied to the whole system (all users). More...

#include <SystemApplicationSettings.h>

Inheritance diagram for te::common::SystemApplicationSettings:

Public Types
typedef ObjectLevelLockingPolicy< ::boost::lock_guard< ::boost::recursive_mutex > >	LockRead

typedef ObjectLevelLockingPolicy< ::boost::lock_guard< ::boost::recursive_mutex > >	LockWrite

typedef volatile ApplicationSettings	VolatileType

Public Member Functions
void	changed ()
	This method can be used by clients to inform manually that the internal state has changed. More...

const boost::property_tree::ptree &	getAllSettings () const
	It return a reading reference to the internal settings. More...

boost::property_tree::ptree &	getAllSettings ()
	It return a reference to the internal settings. More...

std::string	getValue (const std::string &key)
	It returns the value for a given key or empty. More...

void	load (const std::string &fileName)
	It tries to find a default config file based on system macros and default condigurations. More...

void	setValue (const std::string &key, const std::string &value)
	It stores the value according to the key. More...

void	update ()
	It updates the application settings. More...

Static Public Member Functions
static T &	getInstance ()
	It returns a reference to the singleton instance. More...

Protected Member Functions
	SystemApplicationSettings ()
	It initializes the singleton. More...

	~SystemApplicationSettings ()
	Destructor. More...

Protected Attributes
bool	m_dirty
	A dirty bit to indicate wheter the clients have made changes in the settings since the last update. More...

std::string	m_file
	The settings file name. More...

boost::property_tree::ptree	m_settings
	This will keep our settings in memory. More...

Friends
class	Singleton< SystemApplicationSettings >

Detailed Description

A singleton for managing application settings applied to the whole system (all users).

This singleton can be used to keep the application configuration.

It will look for an application configuration file as follows:

first, searchs for the application configuration file in the current application dir
then it check for this file in the application data dir (plataform dependent!)
use a location defined by an environment variable TERRALIB_DIR_ENVVAR and a sub-dir defined by the macro TERRALIB_CONFIG_DIR

Definition at line 53 of file SystemApplicationSettings.h.

Member Typedef Documentation

typedef ObjectLevelLockingPolicy<::boost::lock_guard< ::boost::recursive_mutex > > te::common::ObjectLevelLockable< ApplicationSettings , ::boost::recursive_mutex , ::boost::lock_guard< ::boost::recursive_mutex > , ::boost::lock_guard< ::boost::recursive_mutex > >::LockRead

inherited

Definition at line 205 of file ThreadingPolicies.h.

typedef ObjectLevelLockingPolicy<::boost::lock_guard< ::boost::recursive_mutex > > te::common::ObjectLevelLockable< ApplicationSettings , ::boost::recursive_mutex , ::boost::lock_guard< ::boost::recursive_mutex > , ::boost::lock_guard< ::boost::recursive_mutex > >::LockWrite

inherited

Definition at line 206 of file ThreadingPolicies.h.

typedef volatile ApplicationSettings te::common::ObjectLevelLockable< ApplicationSettings , ::boost::recursive_mutex , ::boost::lock_guard< ::boost::recursive_mutex > , ::boost::lock_guard< ::boost::recursive_mutex > >::VolatileType

inherited

Definition at line 204 of file ThreadingPolicies.h.

Constructor & Destructor Documentation

te::common::SystemApplicationSettings::SystemApplicationSettings ( )

protected

It initializes the singleton.

te::common::SystemApplicationSettings::~SystemApplicationSettings ( )

protected

Destructor.

Member Function Documentation

void te::common::ApplicationSettings::changed ( )

inlineinherited

This method can be used by clients to inform manually that the internal state has changed.

This method is useful when accessing the internal settings structure.

Note: Thread-safe depending on ThreadingPolicy.

Definition at line 238 of file ApplicationSettings.h.

References te::common::ApplicationSettings::m_dirty.

const boost::property_tree::ptree & te::common::ApplicationSettings::getAllSettings ( ) const

inlineinherited

It return a reading reference to the internal settings.

Returns: A read reference to the internal settings.

Note: Take care when keeping a reference to this property in a multi-thread environment.

Definition at line 245 of file ApplicationSettings.h.

References te::common::ApplicationSettings::m_settings.

boost::property_tree::ptree & te::common::ApplicationSettings::getAllSettings ( )

inlineinherited

It return a reference to the internal settings.

Returns: A reference to the internal settings.

Note: Depending on the ThreadingPolicy you can synchronize the read/write from/to the settings. The client of this method will be responsible for informing changes. Release any lock before calling the update method or any other thread-safe method if you are not using a recursive mutex in the threading policy.

Definition at line 250 of file ApplicationSettings.h.

References te::common::ApplicationSettings::m_settings.

template<class T >

T & te::common::Singleton< T >::getInstance ( )

inlinestaticinherited

It returns a reference to the singleton instance.

Returns: A reference to the singleton instance.

Definition at line 120 of file Singleton.h.

std::string te::common::ApplicationSettings::getValue ( const std::string & key )

inlineinherited

It returns the value for a given key or empty.

Parameters

key	The key used to identify the searched value.

Returns: The value for a given key or empty.

Note: Thread-safe depending on ThreadingPolicy.

Definition at line 190 of file ApplicationSettings.h.

References te::common::ApplicationSettings::m_settings.

void te::common::SystemApplicationSettings::load ( const std::string & fileName )

It tries to find a default config file based on system macros and default condigurations.

It loads the setting from the given file.

Parameters

fileName It must be the full path to the settings file.

void te::common::ApplicationSettings::setValue	(	const std::string &	key,
		const std::string &	value
	)

inlineinherited

It stores the value according to the key.

Parameters

key	The key used to identify the given value. The key must follow the same rules as XML elements and they can be subclassified using a dot notation: setValue(key.subkey.subsubkey, value).
value	The value to be stored, any valid string.

Note: If you want to store a binary value you can encode it as an hex-string.; Thread-safe depending on ThreadingPolicy.

Definition at line 182 of file ApplicationSettings.h.

References te::common::ApplicationSettings::m_dirty, and te::common::ApplicationSettings::m_settings.

void te::common::ApplicationSettings::update ( )

inlineinherited

It updates the application settings.

Note: This function is called automatically from ApplicationSettings's destructor.; If application settings is empty it discards the config file.; Thread-safe depending on ThreadingPolicy.

Definition at line 216 of file ApplicationSettings.h.

References te::common::ApplicationSettings::m_dirty, te::common::ApplicationSettings::m_file, te::common::ApplicationSettings::m_settings, and te::core::FileSystem::remove().

Referenced by te::common::ApplicationSettings::~ApplicationSettings().