Add PointersBufferPoolMXBean to track allocated/deallocated pointers

Author: digiovinazzo

src/main/java/org/bytedeco/javacpp/Pointer.java

@@ -32,6 +32,7 @@
 import java.nio.ByteOrder;
 import java.util.Iterator;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicLong;
 import org.bytedeco.javacpp.annotation.Name;
 import org.bytedeco.javacpp.annotation.Platform;
 import org.bytedeco.javacpp.tools.Generator;
@@ -285,6 +286,7 @@ static class DeallocatorReference extends PhantomReference<Pointer> implements D
         Deallocator deallocator;
 
         static volatile long totalBytes = 0;
+        static AtomicLong totalCount = new AtomicLong();
         long bytes;
 
         AtomicInteger count;
@@ -298,6 +300,7 @@ final void add() {
                     next.prev = head = this;
                 }
                 totalBytes += bytes;
+                totalCount.incrementAndGet();
             }
         }
 
@@ -316,6 +319,7 @@ final void remove() {
                 }
                 prev = next = this;
                 totalBytes -= bytes;
+                totalCount.decrementAndGet();
             }
         }
 
@@ -527,6 +531,11 @@ public static long totalBytes() {
         return DeallocatorReference.totalBytes;
     }
 
+    /** Returns {@link DeallocatorReference#totalCount}, current number of pointers tracked by deallocators. */
+    public static long totalCount() {
+        return DeallocatorReference.totalCount.get();
+    }
+
     /** Returns {@link #maxPhysicalBytes}, the maximum amount of physical memory that should be used. */
     public static long maxPhysicalBytes() {
         return maxPhysicalBytes;

src/main/java/org/bytedeco/javacpp/tools/Logger.java

@@ -43,6 +43,11 @@ public static Logger create(Class cls) {
     static {
         String s = System.getProperty("org.bytedeco.javacpp.logger.debug", "false").toLowerCase();
         debug = s.equals("true") || s.equals("t") || s.equals("");
+
+        String mx = System.getProperty("org.bytedeco.javacpp.mxbean", "false").toLowerCase();
+        if (mx.equals("true") || mx.equals("t") || mx.equals("")) {
+            PointersBufferPoolMXBean.register();
+        }
     }
 
     /** Returns the "org.bytedeco.javacpp.logger.debug" system property. */