protected virtual PluginDomainInstanceLoader GetPluginInstanceLoader(string pluginConfigFilePath, string pluginFilePath)
{
if (string.IsNullOrEmpty(pluginConfigFilePath) || (PluginInstanceLoadersCacheTimeInMinutes <= 0))
{
// This is not an expensive case with string.IsNullOrEmpty(pluginConfigFilePath), since we are
// not creating spring objects, so don't cache
//
// OR
//
// we've specified to turn off the cache with PluginInstanceLoadersCacheTimeInMinutes <= 0
return(new PluginDomainInstanceLoader(pluginConfigFilePath, pluginFilePath));
}
const string CACHED_PLUGIN_INSTANCE_LOADERS = "_CACHED_PLUGIN_INSTANCE_LOADERS";
string cacheName = CACHED_PLUGIN_INSTANCE_LOADERS + "_" + pluginConfigFilePath + "_" + pluginFilePath;
PluginDomainInstanceLoader loader;
lock (s_CachedPluginInstanceLoadersLock)
{
loader = HttpRuntime.Cache[cacheName] as PluginDomainInstanceLoader;
}
if (loader != null)
{
return(loader);
}
string parentDirPath = Path.GetDirectoryName(Path.GetDirectoryName(pluginFilePath));
loader = new PluginDomainInstanceLoader(pluginConfigFilePath, pluginFilePath);
PluginDomainInstanceLoader loaderAlreadyThere = null;
lock (s_CachedPluginInstanceLoadersLock)
{
loaderAlreadyThere = HttpRuntime.Cache[cacheName] as PluginDomainInstanceLoader;
if (loaderAlreadyThere == null)
{
loader.Acquire();
HttpRuntime.Cache.Add(cacheName, loader, new CacheDependency(parentDirPath),
Cache.NoAbsoluteExpiration, TimeSpan.FromMinutes(PluginInstanceLoadersCacheTimeInMinutes),
CacheItemPriority.AboveNormal, OnCachePluginDomainInstanceLoaderRemovedCallback);
}
}
if (loaderAlreadyThere != null)
{
// Switch over to already cached instance
DisposableBase.SafeDispose(ref loader);
loader = loaderAlreadyThere;
}
return(loader);
}
public PluginDisposer(PluginDomainInstanceLoader loader)
{
_loader = loader;
_loader.Acquire();
}