JVM runtime

<cfcomponent>
	<!--- Get a list of DSNs in the current cf admin --->
	<cffunction access="public" returntype="String" name="getDSNs">
		<cfscript>
			var sf = createObject("java","coldfusion.server.ServiceFactory");
			var dsns = sf.getDataSourceService().getNames();
			return dsns;
		</cfscript>
	</cffunction>

	<!--- Get current sessions --->
	<cffunction name="getSessionCount" access="public" returntype="numeric">
		<cfset var oSession = createObject("java","coldfusion.runtime.SessionTracker")>
		<cfreturn oSession.getSessionCount()>
	</cffunction>

	<!--- Get current sessions per application --->
	<cffunction name="getAppSessionCount" access="public" returntype="numeric">
		<cfargument name="appName" type="string" required="true">
		<cfscript>
			var oSession = createObject("java","coldfusion.runtime.SessionTracker");
			var mySessions= oSession.getSessionCollection(arguments.appName);
			return StructCount(mySessions);
		</cfscript>
	</cffunction>

	<!--- getJavaMemoryInfo :: gets memory usage of the underlying java runtime  --->
	<cffunction name="getJavaMemoryInfo" access="public" returntype="struct">
		<cfscript>
			var runtime = createObject("java","java.lang.Runtime").getRuntime();
			var stMemInfo = structNew();

			stMemInfo.freeMemory = runtime.freeMemory();
			stMemInfo.maxMemory = runtime.maxMemory();
			stMemInfo.totalMemory = runtime.totalMemory();
			stMemInfo.heapMemory = runtime.totalMemory()-runtime.freeMemory();

			return stMemInfo;
		</cfscript>
	</cffunction>

	<!--- getProcessorCount :: gets number of processors (that the java runtime can access) in the machine. --->
	<cffunction name="getProcessorCount" access="public" returntype="numeric">
		<cfscript>
			var runtime = createObject("java","java.lang.Runtime").getRuntime();
			return runtime.availableProcessors();
		</cfscript>
	</cffunction>

	<!--- getServerName :: gets the servername from the system (should work in both windows and unix platforms) but I haven't tested it recently. --->
	<cffunction name="getServerName" access="public" returntype="string">
		<cfset var machineName = "">
		<cfset var factory = createObject("java", "coldfusion.server.ServiceFactory")>
		
		<cfif factory.runtimeservice.getServerScope().os.name CONTAINS "Windows">
			<cfregistry action="get"
						branch="HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\TCPIP\Parameters"
						entry="Hostname"
						variable="machineName"
						type="String" />
		<cfelse>
			<cfexecute name="/bin/hostname" variable="machineName" timeout="5" />
		</cfif>
		
		<cfreturn LCase(trim(machineName))>
	</cffunction>

	<!--- getCFInstanceName :: return the instance name - useful in clusters to see which instance is handling the request. --->
	<cffunction name="getCFInstanceName" access="public" returntype="string">
		<cfscript>
			var jrunObj = createObject("java", "jrunx.kernel.JRun");
			return jrunObj.getServerName();
		</cfscript>
	</cffunction>
	
	<!--- restartCF :: restart jrun --->
	<cffunction name="restartCF" access="public" returntype="void">
		<cfscript>
			var jrunObj = createObject("java", "jrunx.kernel.JRun");
			jrunObj.restart(jrunObj.getServerName());
		</cfscript>
	</cffunction>
</cfcomponent>