start adding non-blocking/async json parser (will take a while)

Author: cowtowncoder

src/main/java/com/fasterxml/jackson/core/base/ParserMinimalBase.java

@@ -54,6 +54,16 @@ public abstract class ParserMinimalBase extends JsonParser
 
     protected final static char CHAR_NULL = '\0';
 
+    /**
+     * @since 2.9
+     */
+    protected final static byte[] NO_BYTES = new byte[0];
+
+    /**
+     * @since 2.9
+     */
+    protected final static int[] NO_INTS = new int[0];
+    
     /*
     /**********************************************************
     /* Constants and fields of former 'JsonNumericParserBase'

src/main/java/com/fasterxml/jackson/core/json/UTF8StreamJsonParser.java

@@ -290,11 +290,9 @@ protected void _releaseBuffers() throws IOException
         if (_bufferRecyclable) {
             byte[] buf = _inputBuffer;
             if (buf != null) {
-                /* 21-Nov-2014, tatu: Let's not set it to null; this way should
-                 *   get slightly more meaningful error messages in case someone
-                 *   closes parser indirectly, without realizing.
-                 */
-                _inputBuffer = ByteArrayBuilder.NO_BYTES;
+                // Let's not set it to null; this way should get slightly more meaningful
+                // error messages in case someone closes parser indirectly, without realizing.
+                _inputBuffer = NO_BYTES;
                 _ioContext.releaseReadIOBuffer(buf);
             }
         }