From d89b2099cc3d4b0dc6e85a83050cb8083156bc88 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Sat, 13 Jun 2015 11:06:09 +1200
Subject: Improve stack trace logging

---
 src/org/traccar/helper/Log.java | 61 ++++++++++++++++++++++++++++++++---------
 1 file changed, 48 insertions(+), 13 deletions(-)

(limited to 'src/org/traccar/helper/Log.java')

diff --git a/src/org/traccar/helper/Log.java b/src/org/traccar/helper/Log.java
index 648d4803f..1601994fb 100644
--- a/src/org/traccar/helper/Log.java
+++ b/src/org/traccar/helper/Log.java
@@ -109,23 +109,12 @@ public class Log {
         StringBuilder s = new StringBuilder();
         if (msg != null) {
             s.append(msg);
-            s.append(" - ");
         }
         if (exception != null) {
-            String exceptionMsg = exception.getMessage();
-            if (exceptionMsg != null) {
-                s.append(exceptionMsg);
+            if (msg != null) {
                 s.append(" - ");
             }
-            s.append(exception.getClass().getName());
-            StackTraceElement[] stack = exception.getStackTrace();
-            if (stack.length > 0) {
-                s.append(" (");
-                s.append(stack[0].getFileName());
-                s.append(":");
-                s.append(stack[0].getLineNumber());
-                s.append(")");
-            }
+            s.append(exception(exception));
         }
         getLogger().warn(s.toString());
     }
@@ -137,6 +126,52 @@ public class Log {
     public static void debug(String msg) {
         getLogger().debug(msg);
     }
+    
+    private static final int MESSAGE_LIMIT = 80;
+    private static final int STACK_LIMIT = 3;
+    
+    public static String exception(Throwable exception) {
+        StringBuilder s = new StringBuilder();
+        String exceptionMsg = exception.getMessage();
+        if (exceptionMsg != null) {
+            s.append(exceptionMsg);
+            s.append(" - ");
+        }
+        s.append(exception.getClass().getSimpleName());
+        StackTraceElement[] stack = exception.getStackTrace();
+        if (stack.length > 0) {
+            s.append(" (");
+            s.append(stack[0].getFileName());
+            s.append(":");
+            s.append(stack[0].getLineNumber());
+            
+            if (exceptionMsg == null || exceptionMsg.length() < MESSAGE_LIMIT) {
+                int count = STACK_LIMIT - 1;
+                boolean skip = false;
+                for (int i = 1; i < stack.length; i += 1) {
+                    if (stack[i].getClassName().startsWith("org.traccar")) {
+                        s.append(" < ");
+                        if (skip) {
+                            s.append(" ... < ");
+                            skip = false;
+                        }
+                        s.append(stack[i].getFileName());
+                        s.append(":");
+                        s.append(stack[i].getLineNumber());
+                        count -= 1;
+                        if (count == 0) {
+                            break;
+                        }
+                    } else {
+                        skip = true;
+                    }
+                }
+            }
+            
+            s.append(")");
+        }
+        return s.toString();
+    }
 
     /**
      * Netty logger implementation
-- 
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