A tool to clean up full-thread-dump files

h2/src/tools/org/h2/dev/util/ThreadDumpCleaner.java

+/*
+ * Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
+ * and the EPL 1.0 (http://h2database.com/html/license.html).
+ * Initial Developer: H2 Group
+ */
+package org.h2.dev.util;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.io.LineNumberReader;
+import java.util.ArrayList;
+import java.util.regex.Pattern;
+
+/**
+ * A tool that removes uninteresting lines from stack traces.
+ */
+public class ThreadDumpCleaner {
+    
+    private static final String[] PATTERN = {
+        "\\$\\$YJP\\$\\$",
+        "\"(Attach|Service|VM|GC|DestroyJavaVM|Signal|AWT|AppKit|C2 |" + 
+                "process reaper|YJPAgent-).*?\"(?s).*?\n\n",
+        "   Locked ownable synchronizers:(?s).*?\n\n",
+        "\".*?\".*?\n   java.lang.Thread.State: (TIMED_)?WAITING(?s).*?\n\n",
+        "\".*?\".*?\n   java.lang.Thread.State:.*\n\t" + 
+                "at sun.nio.ch.KQueueArrayWrapper.kevent0(?s).*?\n\n",
+        "\".*?\".*?\n   java.lang.Thread.State:.*\n\t" + 
+                "at java.io.FileInputStream.readBytes(?s).*?\n\n",
+        "\".*?\".*?\n   java.lang.Thread.State:.*\n\t" + 
+                "at sun.nio.ch.ServerSocketChannelImpl.accept(?s).*?\n\n",
+        "JNI global references:.*\n\n",
+    };
+    
+    private ArrayList<Pattern> patterns = new ArrayList<Pattern>();
+    
+    {
+        for (String s : PATTERN) {
+            patterns.add(Pattern.compile(s));
+        }
+    }
+
+    /**
+     * Run the tool.
+     *
+     * @param args the command line arguments
+     */
+    public static void main(String... args) throws IOException {
+        FileReader r = new FileReader(args[0]);
+        LineNumberReader in = new LineNumberReader(new BufferedReader(r));
+        new ThreadDumpCleaner().run(in);
+    }
+    
+    private void run(LineNumberReader in) throws IOException {
+        StringBuilder buff = new StringBuilder();
+        while (true) {
+            String line = in.readLine();
+            if (line == null) {
+                break;
+            }
+            buff.append(line).append('\n');
+            if (line.length() == 0) {
+                System.out.print(filter(buff.toString()));
+                buff = new StringBuilder();
+            }
+        }
+        System.out.print(filter(buff.toString()));
+    }        
+    
+    private String filter(String s) {
+        for (Pattern p : patterns) {
+            s = p.matcher(s).replaceAll("");
+        }
+        return s;
+    }
+    
+}