IDEMPIERE-4405 Add basic cache statistics (#210)

add hit and miss count for cache

org.adempiere.base/src/org/compiere/util/CCache.java

@@ -24,6 +24,7 @@ import java.util.Collections;
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
+import java.util.concurrent.atomic.AtomicLong;
 
 import org.adempiere.base.Service;
 import org.idempiere.distributed.ICacheService;
@@ -136,6 +137,9 @@ public class CCache<K,V> implements CacheInterface, Map<K, V>, Serializable
 	/** Vetoable Change Support	Name	*/
 	private static String		PROPERTYNAME = "cache"; 
 	
+	private final AtomicLong m_hit = new AtomicLong();
+	private final AtomicLong m_miss = new AtomicLong();
+	
 	/**
 	 * 	Get (table) Name
 	 *	@return name
@@ -227,7 +231,10 @@ public class CCache<K,V> implements CacheInterface, Map<K, V>, Serializable
 	{
 		return "CCache[" + m_name 
 			+ ",Exp=" + getExpireMinutes()  
-			+ ", #" + cache.size() + "]";
+			+ ", #" + cache.size()
+			+ ", Hit=" + getHit()
+			+ ", Miss=" + getMiss()
+			+ "]";
 	}	//	toString
 
 	/**
@@ -294,7 +301,12 @@ public class CCache<K,V> implements CacheInterface, Map<K, V>, Serializable
 	public V get(Object key)
 	{
 		expire();
-		return cache.get(key);
+		V v = cache.get(key);
+		if (v == null)
+			m_miss.getAndAdd(1);
+		else
+			m_hit.getAndAdd(1);
+		return v;
 	}	//	get
 
 	/**
@@ -431,4 +443,12 @@ public class CCache<K,V> implements CacheInterface, Map<K, V>, Serializable
 	public boolean isDistributed() {
 		return m_distributed;
 	}
+	
+	public long getHit() {
+		return m_hit.get();
+	}
+	
+	public long getMiss() {
+		return m_miss.get();
+	}
 }	//	CCache

org.adempiere.base/src/org/compiere/util/CacheInfo.java

@@ -61,6 +61,8 @@ public class CacheInfo implements Serializable {
 	private boolean distributed;
 	private InetAddress nodeAddress;
 	private String nodeId;
+	private long hit;
+	private long miss;
 
 	/**
 	 * 
@@ -72,6 +74,8 @@ public class CacheInfo implements Serializable {
 		expireMinutes = cache.getExpireMinutes();
 		maxSize = cache.getMaxSize();
 		distributed = cache.isDistributed();
+		hit = cache.getHit();
+		miss = cache.getMiss();
 	}
 
 	/**
@@ -131,6 +135,22 @@ public class CacheInfo implements Serializable {
 		return nodeId;
 	}
 
+	/**
+	 * 
+	 * @return hit count
+	 */
+	public long getHit() {
+		return hit;
+	}
+	
+	/**
+	 * 
+	 * @return miss count
+	 */
+	public long getMiss() {
+		return miss;
+	}
+	
 	/**
 	 * 
 	 * @param sortByName

org.adempiere.server/src/main/servlet/org/compiere/web/AdempiereMonitor.java

@@ -1435,6 +1435,8 @@ public class AdempiereMonitor extends HttpServlet
 		line.addElement(new th().addElement("Size"));
 		line.addElement(new th().addElement("Expire (Minutes)"));
 		line.addElement(new th().addElement("Max Size"));
+		line.addElement(new th().addElement("Hit"));
+		line.addElement(new th().addElement("Miss"));
 		line.addElement(new th().addElement("Distributed"));
 		table.addElement(line);
 		
@@ -1453,6 +1455,8 @@ public class AdempiereMonitor extends HttpServlet
 			line.addElement(new td().addElement(WebEnv.getCellContent(ccache.getSize())));
 			line.addElement(new td().addElement(WebEnv.getCellContent(ccache.getExpireMinutes())));
 			line.addElement(new td().addElement(WebEnv.getCellContent(ccache.getMaxSize())));
+			line.addElement(new td().addElement(WebEnv.getCellContent(ccache.getHit())));
+			line.addElement(new td().addElement(WebEnv.getCellContent(ccache.getMiss())));
 			line.addElement(new td().addElement(WebEnv.getCellContent(ccache.isDistributed())));
 			if (ccache.getNodeId() != null)
 			{