improve web sessionStat

src/main/java/com/alibaba/druid/support/http/stat/WebAppStat.java

@@ -1,6 +1,7 @@
 package com.alibaba.druid.support.http.stat;
 
 import java.util.ArrayList;
+import java.util.Iterator;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
@@ -20,7 +21,7 @@ public class WebAppStat {
     private final static Log                        LOG                            = LogFactory.getLog(WebAppStat.class);
 
     public final static int                         DEFAULT_MAX_STAT_URI_COUNT     = 1000;
-    public final static int                         DEFAULT_MAX_STAT_SESSION_COUNT = 1000 * 100;
+    public final static int                         DEFAULT_MAX_STAT_SESSION_COUNT = 1000;
 
     private volatile int                            maxStatUriCount                = DEFAULT_MAX_STAT_URI_COUNT;
     private volatile int                            maxStatSessionCount            = DEFAULT_MAX_STAT_SESSION_COUNT;
@@ -32,7 +33,7 @@ public class WebAppStat {
     private final static ThreadLocal<WebAppStat>    currentLocal                   = new ThreadLocal<WebAppStat>();
 
     private final ConcurrentMap<String, WebURIStat> uriStatMap                     = new ConcurrentHashMap<String, WebURIStat>();
-    private final Map<String, WebSessionStat>       sessionStatMap;
+    private final LRUCache<String, WebSessionStat>  sessionStatMap;
 
     private final ReadWriteLock                     sessionStatLock                = new ReentrantReadWriteLock();
 
@@ -50,15 +51,20 @@ public class WebAppStat {
         requestCount.set(0);
         requestCount.set(0);
 
-        sessionStatLock.writeLock().lock();
+        sessionStatLock.readLock().lock();
         try {
+            Iterator<Map.Entry<String, WebSessionStat>> iter = sessionStatMap.entrySet().iterator();
+            while (iter.hasNext()) {
+                Map.Entry<String, WebSessionStat> entry = iter.next();
+                entry.getValue().reset();
+            }
             sessionStatMap.clear();
         } finally {
-            sessionStatLock.writeLock().unlock();
+            sessionStatLock.readLock().unlock();
         }
-        
+
         uriStatMap.clear();
-        
+
         uriStatMapFullCount.set(0);
         uriSessionMapFullCount.set(0);
     }

src/main/java/com/alibaba/druid/support/http/stat/WebSessionStat.java

@@ -16,7 +16,8 @@ public class WebSessionStat {
     private final AtomicInteger concurrentMax        = new AtomicInteger();
     private final AtomicLong    requestCount         = new AtomicLong(0);
     private final AtomicLong    requestErrorCount    = new AtomicLong(0);
-
+    private final AtomicLong    requestTimeNano      = new AtomicLong();
+    
     private final AtomicLong    jdbcFetchRowCount    = new AtomicLong();
     private final AtomicLong    jdbcUpdateCount      = new AtomicLong();
     private final AtomicLong    jdbcExecuteCount     = new AtomicLong();
@@ -25,17 +26,34 @@ public class WebSessionStat {
     private final AtomicLong    jdbcCommitCount      = new AtomicLong();
     private final AtomicLong    jdbcRollbackCount    = new AtomicLong();
 
-    private final AtomicLong    requestTimeNano      = new AtomicLong();
-
     private long                createTimeMillis     = -1L;
     private long                lastAccessTimeMillis = -1L;
 
     private Set<String>         remoteAddresses      = new HashSet<String>();
 
+    private String              principal            = null;
+
     public WebSessionStat(String sessionId){
         super();
         this.sessionId = sessionId;
     }
+    
+    public void reset() {
+        concurrentMax.set(0);
+        requestCount.set(0);
+        requestErrorCount.set(0);
+        requestTimeNano.set(0);
+        
+        jdbcFetchRowCount.set(0);
+        jdbcUpdateCount.set(0);
+        jdbcExecuteCount.set(0);
+        jdbcExecuteTimeNano.set(0);
+        jdbcCommitCount.set(0);
+        jdbcRollbackCount.set(0);
+        
+        remoteAddresses.clear();
+        principal = null;
+    }
 
     public String getSessionId() {
         return sessionId;
@@ -53,6 +71,14 @@ public class WebSessionStat {
         return new Date(createTimeMillis);
     }
 
+    public String getPrincipal() {
+        return principal;
+    }
+
+    public void setPrincipal(String principal) {
+        this.principal = principal;
+    }
+
     public void setCreateTimeMillis(long createTimeMillis) {
         this.createTimeMillis = createTimeMillis;
     }
@@ -154,7 +180,7 @@ public class WebSessionStat {
     public long getRequestCount() {
         return requestCount.get();
     }
-    
+
     public long getRequestErrorCount() {
         return requestErrorCount.get();
     }
@@ -242,6 +268,7 @@ public class WebSessionStat {
         data.put("CreateTime", this.getCreateTime());
         data.put("LastAccessTime", this.getLastAccessTime());
         data.put("RemoteAddress", this.getRemoteAddress());
+        data.put("Principal", this.getPrincipal());
 
         data.put("JdbcCommitCount", this.getJdbcCommitCount());
         data.put("JdbcRollbackCount", this.getJdbcRollbackCount());