nit0906 commented on a change in pull request #372:
URL: https://github.com/apache/jackrabbit-oak/pull/372#discussion_r712767085



##########
File path: 
oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/index/inventory/IndexPrinter.java
##########
@@ -66,97 +71,200 @@ public IndexPrinter(IndexInfoService indexInfoService, 
AsyncIndexInfoService asy
 
     @Override
     public void print(PrintWriter pw, Format format, boolean isZip) {
-        //TODO Highlight if failing
-        printAsyncIndexInfo(pw);
-        printIndexInfo(pw);
+
+        if (format == Format.JSON) {
+            JsopBuilder json = new JsopBuilder();
+            startJsonObject(json);
+            printAsyncIndexInfo(pw, json, format);
+            printIndexInfo(pw, json, format);
+            endJsonObject(json);
+            pw.print(JsopBuilder.prettyPrint(json.toString()));
+        } else {
+            //TODO Highlight if failing
+            printAsyncIndexInfo(pw, null, format);
+            printIndexInfo(pw, null, format);
+        }
     }
 
-    private void printAsyncIndexInfo(PrintWriter pw) {
+    private void printAsyncIndexInfo(PrintWriter pw, JsopBuilder json, Format 
format) {
         List<String> asyncLanes = 
ImmutableList.copyOf(asyncIndexInfoService.getAsyncLanes());
         String title = "Async Indexers State";
-        printTitle(pw, title);
-        pw.printf("Number of async indexer lanes : %d%n", asyncLanes.size());
-        pw.println();
+        printTitle(pw, title, format);
+        addJsonKey(json, title);
+        startJsonObject(json);
+        keyValue("Number of async indexer lanes ", asyncLanes.size(), pw, 
json, format);
+        printWithNewLine(pw, "", format);
+
         for (String lane : asyncLanes) {
-            pw.println(lane);
+            printWithNewLine(pw, lane, format);
+            addJsonKey(json, lane);
             AsyncIndexInfo info = asyncIndexInfoService.getInfo(lane);
+            startJsonObject(json);
             if (info != null) {
-                        pw.printf("    Last indexed to      : %s%n", 
formatTime(info.getLastIndexedTo()));
+                keyValue("    Last indexed to      ", 
formatTime(info.getLastIndexedTo()), pw, json, format);
                 IndexStatsMBean stats = info.getStatsMBean();
                 if (stats != null) {
-                        pw.printf("    Status              : %s%n", 
stats.getStatus());
-                        pw.printf("    Failing             : %s%n", 
stats.isFailing());
-                        pw.printf("    Paused              : %s%n", 
stats.isPaused());
+                    keyValue("    Status              ", stats.getStatus(), 
pw, json, format);
+                    keyValue("    Failing             ", stats.isFailing(), 
pw, json, format);
+                    keyValue("    Paused              ", stats.isPaused(), pw, 
json, format);
                     if (stats.isFailing()) {
-                        pw.printf("    Failing since       : %s%n", 
stats.getFailingSince());
-                        pw.printf("    Latest error        : %s%n", 
stats.getLatestError());
+                        keyValue("    Failing since       ", 
stats.getFailingSince(), pw, json, format);
+                        keyValue("    Latest error        ", 
stats.getLatestError(), pw, json, format);
                     }
                 }
-                pw.println();
+                printWithNewLine(pw, "", format);
             }
+            endJsonObject(json);
         }
+        endJsonObject(json);
     }
 
-    private static void printTitle(PrintWriter pw, String title) {
-        pw.println(title);
-        pw.println(Strings.repeat("=", title.length()));
+    private static void printTitle(PrintWriter pw, String title, Format 
format) {
+        if (format == Format.TEXT) {
+            pw.println(title);
+            pw.println(Strings.repeat("=", title.length()));
+            pw.println();
+        }
     }
 
-    private void printIndexInfo(PrintWriter pw) {
+    private static void printWithNewLine(PrintWriter pw, String printLine, 
Format format) {
+        if (format == Format.TEXT) {
+            pw.println(printLine);
+        }
+    }
+
+    private void printIndexInfo(PrintWriter pw, JsopBuilder json, Format 
format) {
         ListMultimap<String, IndexInfo> infos = ArrayListMultimap.create();
         for (IndexInfo info : indexInfoService.getAllIndexInfo()) {
             infos.put(info.getType(), info);
         }
 
-        pw.printf("Total number of indexes : %d%n", infos.size());
+        keyValue("Total number of indexes ", infos.size(), pw, json, format);
+
         for (String type : infos.keySet()){
             List<IndexInfo> typedInfo = infos.get(type);
             String title = String.format("%s(%d)", type, typedInfo.size());
-            printTitle(pw, title);
-            pw.println();
+            printTitle(pw, title, format);
+            addJsonKey(json, type);
+            startJsonObject(json);
             for (IndexInfo info : typedInfo){
-                printIndexInfo(pw, info);
+                printIndexInfo(pw, json, info, format);
             }
+            endJsonObject(json);
         }
     }
 
-    private static void printIndexInfo(PrintWriter pw, IndexInfo info) {
-        pw.println(info.getIndexPath());
-        pw.printf("    Type                    : %s%n", info.getType());
+
+    private static void printIndexInfo(PrintWriter pw, JsopBuilder json, 
IndexInfo info, Format format) {
+        if (format == Format.TEXT) {
+            pw.println(info.getIndexPath());
+        }
+        addJsonKey(json, info.getIndexPath());
+        startJsonObject(json);
+
+        keyValue("    Type                    ", info.getType(), pw, json, 
format);
         if (info.getAsyncLaneName() != null) {
-            pw.printf("    Async                   : true%n");
-            pw.printf("    Async lane name         : %s%n", 
info.getAsyncLaneName());
+            keyValue("    Async                    ", true, pw, json, format);
+            keyValue("    Async lane name          ", info.getAsyncLaneName(), 
pw, json, format);
         }
 
         if (info.getIndexedUpToTime() > 0){
-            pw.printf("    Last indexed up to      : %s%n", 
formatTime(info.getIndexedUpToTime()));
+            keyValue("    Last indexed up to       ", 
formatTime(info.getIndexedUpToTime()), pw, json, format);
         }
 
         if (info.getLastUpdatedTime() > 0){
-            pw.printf("    Last updated time       : %s%n", 
formatTime(info.getLastUpdatedTime()));
+            keyValue("     Last updated time       ", 
formatTime(info.getLastUpdatedTime()), pw, json, format);
+        }
+
+        if (info.getCreationTimestamp() > 0){
+            keyValue("     Creation time           ", 
formatTime(info.getCreationTimestamp()), pw, json, format);
+        }
+
+        if (info.getReindexCompletionTimestamp() > 0){
+            keyValue("     Reindex completion time ", 
formatTime(info.getReindexCompletionTimestamp()), pw, json, format);
         }
 
         if (info.getSizeInBytes() >= 0){
-            pw.printf("    Size                    : %s%n", 
IOUtils.humanReadableByteCount(info.getSizeInBytes()));
+            keyValue("    Size                     ", 
IOUtils.humanReadableByteCount(info.getSizeInBytes()), pw, json, format);
+            keyValue("    Size (in Bytes)          ", info.getSizeInBytes(), 
pw, json, format);
+        }
+
+        if (info.getSuggestSizeInBytes() >= 0){
+            keyValue("    Suggest size             ", 
IOUtils.humanReadableByteCount(info.getSuggestSizeInBytes()), pw, json, format);
+            keyValue("    Suggest size (in Bytes)  ", 
info.getSuggestSizeInBytes(), pw, json, format);
         }
 
         if (info.getEstimatedEntryCount() >= 0){
-            pw.printf("    Estimated entry count   : %d%n", 
info.getEstimatedEntryCount());
+            keyValue("    Estimated entry count    ", 
info.getEstimatedEntryCount(), pw, json, format);
+        }
+
+        if ("lucene".equals(info.getType())) {
+            // Only valid for lucene type indexes, for others it will simply 
show false.
+            keyValue("    Has hidden oak mount     ", 
info.hasHiddenOakLibsMount(), pw, json, format);
+            keyValue("    Has property index       ", 
info.hasPropertyIndexNode(), pw, json, format);
         }
 
         if (info.hasIndexDefinitionChangedWithoutReindexing()) {
-            pw.println("    Index definition changed without reindexing");
             String diff = info.getIndexDefinitionDiff();
             if (diff != null) {
-                pw.println("    "+diff);
+                keyValue("    Index definition changed without reindexing ", 
diff, pw, json, format);
+                printWithNewLine(pw, "", format);
             }
         }
-        pw.println();
+        endJsonObject(json);
     }
 
     private static String formatTime(long time){
         Calendar cal = Calendar.getInstance();
         cal.setTimeInMillis(time);
-        return ISO8601.format(cal);
+        Date date = cal.getTime();
+        SimpleDateFormat outputFmt = new 
SimpleDateFormat("yyyy-mm-dd'T'HH:mm:ss.s z");
+        outputFmt.setTimeZone(TimeZone.getTimeZone("UTC"));
+        return outputFmt.format(date);
+    }
+
+    private static void keyValue(String key, Object value, PrintWriter pw, 
JsopBuilder json, Format format) {
+        // In case the key is null or an emppty String or value is null,
+        // throw an IllegalArgumentException.
+        if (value == null || key == null || key.equals("")) {

Review comment:
       @thomasmueller 
   I actually added the check post your comment earlier on - 
   
   > I would probably handle "null" separately at the beginning (if value == 
null). Could throw an exception.
   
   I can remove it .




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