Move MapDiagnostics to main project and make it runnable (psvm)

src/main/java/net/openhft/chronicle/hash/ChronicleHashBuilder.java

@@ -36,9 +36,8 @@ import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.TimeUnit;
 
 /**
- * This interface defines the meaning of configurations, common to {@link
- * ChronicleMapBuilder} and {@link ChronicleSetBuilder}, i.
- * e. <i>Chronicle hash container</i> configurations.
+ * This interface defines the meaning of configurations, common to {@link ChronicleMapBuilder} and
+ * {@link ChronicleSetBuilder}, i. e. <i>Chronicle hash container</i> configurations.
  *
  * <p>{@code ChronicleHashBuilder} is mutable. Configuration methods mutate the builder and return
  * <i>the builder itself</i> back to support chaining pattern, rather than the builder copies with

src/main/java/net/openhft/chronicle/map/MapDiagnostics.java

@@ -0,0 +1,43 @@
+/*
+ *      Copyright (C) 2015  higherfrequencytrading.com
+ *
+ *      This program is free software: you can redistribute it and/or modify
+ *      it under the terms of the GNU Lesser General Public License as published by
+ *      the Free Software Foundation, either version 3 of the License.
+ *
+ *      This program 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 Lesser General Public License for more details.
+ *
+ *      You should have received a copy of the GNU Lesser General Public License
+ *      along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.openhft.chronicle.map;
+
+import java.io.File;
+import java.io.IOException;
+
+public final class MapDiagnostics {
+
+    public static void main(String[] args) throws IOException {
+        String mapFile = args[0];
+        try (ChronicleMap map = ChronicleMap.of(Object.class, Object.class)
+                .createPersistedTo(new File(mapFile))) {
+            printMapStats(map);
+        }
+    }
+
+    public static <K, V> void printMapStats(ChronicleMap<K, V> map) {
+        for (int i = 0; i < map.segments(); i++) {
+            try (MapSegmentContext<K, V, ?> c = map.segmentContext(i)) {
+                System.out.printf("segment %d contains %d entries\n", i, c.size());
+                c.forEachSegmentEntry(e -> System.out.printf("%s, %d bytes -> %s, %d bytes\n",
+                        e.key(), e.key().size(), e.value(), e.value().size()));
+            }
+        }
+    }
+
+    private MapDiagnostics() {}
+}