//=====================================================================
/// <summary>
/// Constructor
/// </summary>
/// <param name="component">The <see cref="CopyFromIndexComponent"/> to which the indexed cache belongs</param>
/// <param name="context">A context to use with the key and value XPath expressions</param>
/// <param name="configuration">The configuration to use</param>
protected IndexedCache(CopyFromIndexComponent component, XmlNamespaceManager context,
XPathNavigator configuration)
{
if(component == null)
throw new ArgumentNullException("component");
this.Component = component;
// Get the name of the index
this.Name = configuration.GetAttribute("name", String.Empty);
if(String.IsNullOrWhiteSpace(this.Name))
component.WriteMessage(MessageLevel.Error, "Each index must have a unique name");
// Get the xpath for keys (relative to value nodes)
string keyXPath = configuration.GetAttribute("key", String.Empty);
if(String.IsNullOrWhiteSpace(keyXPath))
component.WriteMessage(MessageLevel.Error, "Each index element must have a key attribute " +
"containing an XPath (relative to the value XPath) that evaluates to the entry key");
// Get the XPath for value nodes
string valueXPath = configuration.GetAttribute("value", String.Empty);
if(String.IsNullOrWhiteSpace(valueXPath))
component.WriteMessage(MessageLevel.Error, "Each index element must have a value attribute " +
"containing an XPath that describes index entries");
try
{
this.KeyExpression = XPathExpression.Compile(keyXPath);
}
catch(XPathException)
{
component.WriteMessage(MessageLevel.Error, "The key expression '{0}' is not a valid XPath " +
"expression", keyXPath);
}
this.KeyExpression.SetContext(context);
try
{
this.ValueExpression = XPathExpression.Compile(valueXPath);
}
catch(XPathException)
{
component.WriteMessage(MessageLevel.Error, "The value expression '{0}' is not a valid XPath " +
"expression", valueXPath);
}
this.ValueExpression.SetContext(context);
}
//=====================================================================
/// <summary>
/// Constructor
/// </summary>
/// <param name="component">The <see cref="CopyFromIndexComponent"/> to which the indexed cache belongs</param>
/// <param name="context">A context to use with the key and value XPath expressions</param>
/// <param name="configuration">The indexed cache configuration</param>
public InMemoryIndexedCache(CopyFromIndexComponent component, XmlNamespaceManager context,
XPathNavigator configuration) : base(component, context, configuration)
{
string cacheValue = configuration.GetAttribute("cache", String.Empty);
int size;
if(String.IsNullOrWhiteSpace(cacheValue) || !Int32.TryParse(cacheValue, out size) || size < 1)
size = 15;
this.cacheSize = size;
// Set up the cache
queue = new ConcurrentQueue<string>();
cache = new ConcurrentDictionary<string, IndexedDocument>(4 * Environment.ProcessorCount, size);
}
