Reuse encoder

This is a tiny improvement: reuse the encoder for initilization of all
three byte arrays.

Change-Id: Ic01e9fcf1667ca6f28e089dae291f9a7acfecd30
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>

diff --git a/netconf/netconf-netty-util/src/main/java/org/opendaylight/netconf/nettyutil/handler/MessageParts.java b/netconf/netconf-netty-util/src/main/java/org/opendaylight/netconf/nettyutil/handler/MessageParts.java
index 2921a84796dc995b907a73700c422e315fc62e1c..6802507b2caa1858b5bba7fe32cb2f72a6cd85cf 100644 (file)
--- a/netconf/netconf-netty-util/src/main/java/org/opendaylight/netconf/nettyutil/handler/MessageParts.java
+++ b/netconf/netconf-netty-util/src/main/java/org/opendaylight/netconf/nettyutil/handler/MessageParts.java
@@ -7,9 +7,9 @@
  */
 package org.opendaylight.netconf.nettyutil.handler;
 
-import java.nio.ByteBuffer;
 import java.nio.CharBuffer;
 import java.nio.charset.CharacterCodingException;
+import java.nio.charset.CharsetEncoder;
 import java.nio.charset.CodingErrorAction;
 import java.nio.charset.StandardCharsets;
 import org.opendaylight.netconf.util.messages.FramingMechanism;
@@ -20,27 +20,32 @@ import org.opendaylight.netconf.util.messages.FramingMechanism;
  * @author Thomas Pantelis
  */
 final class MessageParts {
-    static final byte[] END_OF_MESSAGE = asciiBytes(FramingMechanism.EOM_STR);
-    static final byte[] START_OF_CHUNK = asciiBytes(FramingMechanism.CHUNK_START_STR);
-    static final byte[] END_OF_CHUNK = asciiBytes(FramingMechanism.CHUNK_END_STR);
+    static final byte[] END_OF_MESSAGE;
+    static final byte[] START_OF_CHUNK;
+    static final byte[] END_OF_CHUNK;
 
-    private MessageParts() {
-        // Hidden on purpose
-    }
+    static {
+        final var encoder = StandardCharsets.US_ASCII.newEncoder()
+            .onMalformedInput(CodingErrorAction.REPORT)
+            .onUnmappableCharacter(CodingErrorAction.REPORT);
 
-    private static byte[] asciiBytes(final String str) {
-        final ByteBuffer buf;
         try {
-            buf = StandardCharsets.US_ASCII.newEncoder()
-                .onMalformedInput(CodingErrorAction.REPORT)
-                .onUnmappableCharacter(CodingErrorAction.REPORT)
-                .encode(CharBuffer.wrap(str));
+            END_OF_MESSAGE = getBytes(encoder, FramingMechanism.EOM_STR);
+            START_OF_CHUNK = getBytes(encoder, FramingMechanism.CHUNK_START_STR);
+            END_OF_CHUNK = getBytes(encoder, FramingMechanism.CHUNK_END_STR);
         } catch (CharacterCodingException e) {
             throw new ExceptionInInitializerError(e);
         }
+    }
+
+    private MessageParts() {
+        // Hidden on purpose
+    }
 
-        final byte[] ret = new byte[buf.remaining()];
-        buf.get(ret);
-        return ret;
+    private static byte[] getBytes(final CharsetEncoder encoder, final String str) throws CharacterCodingException {
+        final var buf = encoder.encode(CharBuffer.wrap(str));
+        final var bytes = new byte[buf.remaining()];
+        buf.get(bytes);
+        return bytes;
     }
 }