1 files changed, 111 insertions, 0 deletions
diff --git a/src/main/src/utils/JVMStatsDumper.java b/src/main/src/utils/JVMStatsDumper.java
new file mode 100644
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+++ b/src/main/src/utils/JVMStatsDumper.java
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+/*
+ * SSSync, a Simple and Stupid Synchronizer for data with multi-valued attributes
+ * Copyright (C) 2014  Ludovic Pouzenc <ludovic@pouzenc.fr>
+ *  
+ * This file is part of SSSync.
+ *
+ *  SSSync is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  SSSync is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with SSSync.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package utils;
+
+import java.lang.management.GarbageCollectorMXBean;
+import java.lang.management.ManagementFactory;
+import java.lang.management.MemoryPoolMXBean;
+import java.lang.management.MemoryUsage;
+import java.lang.management.RuntimeMXBean;
+
+import org.apache.log4j.Level;
+import org.apache.log4j.Logger;
+
+/**
+ * TODO javadoc
+ * 
+ * @author lpouzenc
+ */
+public class JVMStatsDumper {
+	private static final Logger logger = Logger.getLogger(JVMStatsDumper.class.getName());
+
+	public static void logGCStats() {
+		// Skip all string construction if will not print this stuff
+		if ( logger.getLevel().isGreaterOrEqual(Level.INFO) ) { return; }
+	
+		long totalGarbageCollections = 0;
+		long garbageCollectionTime = 0;
+	
+		final String gcDumpHeader="Dumping Garbage Collector statistics\n" +
+				"+--------------------+-----------------------------+\n" +
+				"+      GC Name       +    Count     +   Time (ms)  +\n" +
+				"+--------------------+--------------+--------------+\n";
+	
+		StringBuilder sb = new StringBuilder(1024);
+		sb.append(gcDumpHeader);
+	
+		for(GarbageCollectorMXBean gc : ManagementFactory.getGarbageCollectorMXBeans()) {
+	
+			long count = gc.getCollectionCount();
+			long time = gc.getCollectionTime();
+			
+			sb.append(String.format("+ %18s + %,12d + %,12d +%n", gc.getName(), count, time));
+	
+			if(count >= 0) totalGarbageCollections += count;
+			if(time >= 0) garbageCollectionTime += time;
+		}
+	
+		sb.append("+                    +              +              +\n");
+		sb.append(String.format("+ %18s + %,12d + %,12d +%n",
+				"Total", totalGarbageCollections, garbageCollectionTime
+				));
+		sb.append("+--------------------+--------------+--------------+\n");
+		
+		sb.append("JVM arguments : ");
+		RuntimeMXBean runtimeMxBean = ManagementFactory.getRuntimeMXBean();
+		for ( String arg : runtimeMxBean.getInputArguments() ) {
+			sb.append(arg + " ");
+		}
+		
+		logger.debug(sb);
+	}
+
+	/**
+	 * Helper function to log the current memory usage
+	 */
+	public static void logMemoryUsage() {
+		// Skip all string construction if will not print this stuff
+		if ( logger.getLevel().isGreaterOrEqual(Level.INFO) ) { return; }
+		
+		final String memDumpHeader="Dumping memory statistics\n" +
+				"+--------------------------------------------------------------------------------+\n" +
+				"+                    +         Current (kio)       +           Peak (kio)        +\n" +
+				"+        Pool        +-----------------------------------------------------------+\n" +
+				"+                    +     Used     +  Committed   +     Used     +  Committed   +\n" +
+				"+--------------------+--------------+--------------+--------------+--------------+\n";
+		
+		StringBuilder sb = new StringBuilder(1024);
+		sb.append(memDumpHeader);
+		
+		for (MemoryPoolMXBean pool : ManagementFactory.getMemoryPoolMXBeans()) {
+			MemoryUsage peak = pool.getPeakUsage();
+			MemoryUsage curr = pool.getUsage();
+			sb.append(String.format("+ %18s + %,12d + %,12d + %,12d + %,12d +%n",
+					pool.getName(),curr.getUsed()/1024, curr.getCommitted()/1024, peak.getUsed()/1024, peak.getCommitted()/1024
+					));
+			pool.resetPeakUsage(); //XXX Maybe this is not a global action and is useless on a temporary object used once
+		}
+		sb.append("+--------------------+--------------+--------------+--------------+--------------+\n");
+		
+		logger.debug(sb);
+	}
+
+}