Started implementing support for CDB/PDB handling. Experimental commit.

 package se.lil.om;
 
 import java.sql.*;
+import java.util.HashMap;
+import java.util.Hashtable;
 import java.util.Properties;
 import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantLock;
@@ -12,6 +14,13 @@ public class OraMon {
 	String conPass = "passw0rd";
 	String dbName = null;
 	
+	Boolean isPDB = false;
+	Boolean isCDB = false;
+	Boolean hasContainers = null;
+	OraMon containerDB = null;
+	
+	private Hashtable<String, OraMon> myPDBs = null;
+	
 	public static final int SYSSTAT = 1;
 	public static final int OSSTAT = 2;
 	
@@ -37,6 +46,20 @@ public class OraMon {
 		return this.conString;
 	}
 	
+	public String getServiceName() {
+		if(this.conString != null) {
+			int last = this.conString.lastIndexOf('/');
+			if(last >=0)
+				return this.conString.substring(last +1);
+			else {
+				last = this.conString.lastIndexOf(':');
+				return this.conString.substring(last +1);
+			}
+		} else {
+			return null;
+		}
+	}
+	
 	//NUM_CPUS
 	int numCpus = 0;
 	public long getNumberOfCPUs() throws Throwable {
@@ -168,19 +191,27 @@ public class OraMon {
 	}
 	
 	long lastFetchTSns = 0;
-	public boolean getData(long ageTs) throws Throwable {
-		if ((System.nanoTime() - lastFetchTSns) > (ageTs * 1000 * 1000 * 1000)) return getData();
-		else return false;
-	}
 	
 	public long getAgeTs() {
 		return (System.nanoTime() - lastFetchTSns)/(1000*1000*1000);
 	}
 	
+	public boolean getData() throws Throwable {
+		return getData(0);
+	}
+	
 	Lock lock = new ReentrantLock();
 	Throwable lastEx = null;
 	
- 	public boolean getData() throws Throwable {
+ 	public boolean getData(long ageTs) throws Throwable {
+ 		//Check age
+ 		if ((System.nanoTime() - lastFetchTSns) < (ageTs * 1000 * 1000 * 1000)) return false;
+ 		//Bail out if we are a PDB and ask the CDB OraMon object to update us
+ 		if(isPDB) {
+ 			if(containerDB != null) return containerDB.getData(ageTs);
+ 			// If we get here its strange. We know we are a PDB but we have no CDB object.
+ 			// Lets see if we ever end up here ;)
+ 		}
  		// Start thread safe
  		// Try to get a lock
  		boolean haveLock = lock.tryLock();
@@ -213,7 +244,7 @@ public class OraMon {
 			Statement stmt = conn.createStatement();
 			ResultSet rset = null;
 			
-			//Get the database name once
+			//Get the database name once // Currently always gets the CDB name
 			if(this.dbName == null) {
 				rset = stmt.executeQuery("select value from V$SYSTEM_PARAMETER where name = 'db_name'");
 				rset.next();
@@ -221,12 +252,37 @@ public class OraMon {
 				rset.close(); 
 			}
 			
+			// Check if we can have containers
+			if(hasContainers == null) {
+				// We don't know, check if the CONTAINERS view exists in the database
+				rset = stmt.executeQuery("select count(*) from SYS.ALL_VIEWS where VIEW_NAME = 'V_$CONTAINERS'");
+				if(rset.next()) {
+					if(rset.getInt(0) == 1) {
+						// We found the containers view. Enable container handling
+						hasContainers = true;
+						if(getServiceName().equals(this.dbName)) isCDB = true;
+					}
+				}
+			}
+			
+			// If we have containers, but we are not the CDB, then we are a PDB. 
+			// At this point we should close the connections, and ask the CDB OraMon object to getData() instead, and update us.
+			if(hasContainers && isCDB == false) {
+				
+			}
+			
 			//Get the entire V_$OSSTAT table from DB
 			colOsStat.update(stmt.executeQuery("select systimestamp, stat_name, value from V$OSSTAT"));
 			
 			//Set numCpus
 			this.numCpus = (int) colOsStat.getCurrentValue("NUM_CPUS");
 			
+			// Get OS Load
+			osLoad.update(stmt.executeQuery("select systimestamp, value from V$OSSTAT where stat_name='LOAD'"));
+			
+			
+			// SYSSTAT and SYS_TIME_MODEL are specific for PDB and CDB/Instance is the total.
+			
 			// Get DB CPU use time
 			rset = stmt.executeQuery("select systimestamp, s.value as NIWT, t.value as DBCPU from V$SYSSTAT s, V$SYS_TIME_MODEL t where s.name='non-idle wait time' and t.STAT_NAME='DB CPU'");
 			rset.next();
@@ -234,12 +290,6 @@ public class OraMon {
 			cpuTime.update(rset.getLong(3), rset.getTimestamp(1));
 			rset.close();
 	
-//			cpuTime.update(stmt.executeQuery("select systimestamp, value from V$SYS_TIME_MODEL where stat_name='DB CPU'"));
-//			niwTime.update(stmt.executeQuery("select systimestamp, value from V$SYSSTAT where name='non-idle wait time'"));
-			
-			// Get OS Load
-			osLoad.update(stmt.executeQuery("select systimestamp, value from V$OSSTAT where stat_name='LOAD'"));
-	
 			//Get the entire V_$SYSSTAT table from DB
 			colSysStat.update(stmt.executeQuery("select systimestamp, name, value from V$SYSSTAT"));