private WebAppSettingStore GetWriteSettingStore()
{
rrLock.EnterUpgradeableReadLock();
try
{
GetSettingStore();
if (_settingStore == null) // setting store not yet created
{
rrLock.EnterWriteLock();
try
{
_settingStore = WebAppSettingStore.Create(this.webApplication);
}
finally
{
rrLock.ExitWriteLock();
}
}
return _settingStore;
}
finally
{
rrLock.ExitUpgradeableReadLock();
}
}
private WebAppSettingStore GetSettingStore()
{
rrLock.EnterUpgradeableReadLock();
try
{
if (_settingStore == null || (DateTime.Now.Subtract(lastLoad).TotalSeconds) > cacheInterval)
{
//Need to exist so don't deadlock.
rrLock.EnterWriteLock();
try
{
//make sure first another thread didn't already load...
if (_settingStore == null || (DateTime.Now.Subtract(lastLoad).TotalSeconds) > cacheInterval)
{
_settingStore = WebAppSettingStore.Load(this.webApplication);
lastLoad = DateTime.Now;
}
}
finally
{
rrLock.ExitWriteLock();
}
}
return(_settingStore);
}
finally
{
rrLock.ExitUpgradeableReadLock();
}
}
public void Remove(string key)
{
var logger = SharePointServiceLocator.GetCurrent().GetInstance <ILogger>();
rrLock.EnterWriteLock();
try
{
//intentionally nested, both cases getting a write lock, is safe and ensures no race.
//Force the reload of the persisted object, which minimizes chances of a failure due
// to a concurrency failure.
Reset();
WebAppSettingStore store = GetWriteSettingStore();
if (store.Settings.ContainsKey(key))
{
store.Settings.Remove(key);
store.Update();
}
}
catch (SPUpdatedConcurrencyException)
{
Reset();
throw;
}
finally
{
rrLock.ExitWriteLock();
}
}
private WebAppSettingStore GetWriteSettingStore()
{
rrLock.EnterUpgradeableReadLock();
try
{
GetSettingStore();
if (_settingStore == null) // setting store not yet created
{
rrLock.EnterWriteLock();
try
{
_settingStore = WebAppSettingStore.Create(this.webApplication);
}
finally
{
rrLock.ExitWriteLock();
}
}
return(_settingStore);
}
finally
{
rrLock.ExitUpgradeableReadLock();
}
}
/// <summary>
/// Gets or sets a value based on the key. If the value is not defined in this PropertyBag, it will look in it's
/// parent property bag.
/// </summary>
/// <value></value>
/// <returns>The config value defined in the property bag. </returns>
public string this[string key]
{
[SharePointPermission(SecurityAction.InheritanceDemand, ObjectModel = true)]
[SharePointPermission(SecurityAction.LinkDemand, ObjectModel = true)]
get
{
WebAppSettingStore store = GetSettingStore();
if (store == null) //store doesn't exist, so setting doesn't exist...
{
return(null);
}
rrLock.EnterReadLock();
try
{
if (!store.Settings.ContainsKey(key))
{
return(null);
}
return(store.Settings[key]);
}
finally
{
rrLock.ExitReadLock();
}
}
[SharePointPermission(SecurityAction.InheritanceDemand, ObjectModel = true)]
[SharePointPermission(SecurityAction.LinkDemand, ObjectModel = true)]
set
{
rrLock.EnterWriteLock();
try
{
//intentionally nested, Reset is also getting a write lock, is safe and ensures no race.
//Force the reload of the persisted object, which minimizes chances of a failure due
// to a concurrency failure.
Reset();
WebAppSettingStore store = GetWriteSettingStore();
store.Settings[key] = value;
store.Update();
}
catch (SPUpdatedConcurrencyException)
{
Reset();
throw;
}
finally
{
rrLock.ExitWriteLock();
}
}
}
/// <summary>
/// Forces the property bag to reload settings on next access.
/// </summary>
public void Reset()
{
rrLock.EnterWriteLock();
try
{
_settingStore = null;
}
finally
{
rrLock.ExitWriteLock();
}
}
/// <summary>
/// Forces the property bag to reload settings on next access.
/// </summary>
public void Reset()
{
rrLock.EnterWriteLock();
try
{
_settingStore = null;
}
finally
{
rrLock.ExitWriteLock();
}
}
/// <summary>
/// Creates the setting store for a web application
/// </summary>
/// <param name="webApp">The parent web app to store the settings</param>
/// <returns>The web app setting store instance</returns>
public static WebAppSettingStore Create(SPWebApplication webApp)
{
lock (createlock)
{
//load to make sure it wasn't already created in a race...
var settingStore = webApp.GetChild <WebAppSettingStore>(WebAppSettingStore.StoreName);
if (settingStore == null)
{
settingStore = new WebAppSettingStore(WebAppSettingStore.StoreName, webApp);
settingStore.Update();
}
return(settingStore);
}
}
public bool Contains(string key)
{
WebAppSettingStore store = GetSettingStore();
if (store == null) //store doesn't exist, so setting doesn't exist...
{
return(false);
}
rrLock.EnterReadLock();
try
{
return(store.Settings.ContainsKey(key));
}
finally
{
rrLock.ExitReadLock();
}
}
private WebAppSettingStore GetSettingStore()
{
rrLock.EnterUpgradeableReadLock();
try
{
if (_settingStore == null || (DateTime.Now.Subtract(lastLoad).TotalSeconds) > cacheInterval)
{
//Need to exist so don't deadlock.
rrLock.EnterWriteLock();
try
{
//make sure first another thread didn't already load...
if (_settingStore == null || (DateTime.Now.Subtract(lastLoad).TotalSeconds) > cacheInterval)
{
_settingStore = WebAppSettingStore.Load(this.webApplication);
lastLoad = DateTime.Now;
}
}
finally
{
rrLock.ExitWriteLock();
}
}
return _settingStore;
}
finally
{
rrLock.ExitUpgradeableReadLock();
}
}
/// <summary>
/// For internal use, clears the cached setting store data
/// </summary>
public static void ClearCache()
{
_settingStore = null;
}
/// <summary>
/// For internal use, clears the cached setting store data
/// </summary>
public static void ClearCache()
{
_settingStore = null;
}
/// <summary>
/// Creates the setting store for a web application
/// </summary>
/// <param name="webApp">The parent web app to store the settings</param>
/// <returns>The web app setting store instance</returns>
public static WebAppSettingStore Create(SPWebApplication webApp)
{
lock (createlock)
{
//load to make sure it wasn't already created in a race...
var settingStore = webApp.GetChild<WebAppSettingStore>(WebAppSettingStore.StoreName);
if (settingStore == null)
{
settingStore = new WebAppSettingStore(WebAppSettingStore.StoreName, webApp);
settingStore.Update();
}
return settingStore;
}
}
