Improve the performance of jackson-dataformat-msgpack (#866)

* Improve the perf of msgpack-jackson

* Refactoring

Author: komamitsu

msgpack-jackson/src/main/java/org/msgpack/jackson/dataformat/ExtensionTypeCustomDeserializers.java

@@ -35,15 +35,7 @@ public ExtensionTypeCustomDeserializers(ExtensionTypeCustomDeserializers src)
 
     public void addCustomDeser(byte type, final Deser deser)
     {
-        deserTable.put(type, new Deser()
-        {
-            @Override
-            public Object deserialize(byte[] data)
-                    throws IOException
-            {
-                return deser.deserialize(data);
-            }
-        });
+        deserTable.put(type, deser);
     }
 
     public Deser getDeser(byte type)

msgpack-jackson/src/main/java/org/msgpack/jackson/dataformat/JavaInfo.java

@@ -0,0 +1,41 @@
+//
+// MessagePack for Java
+//
+//    Licensed under the Apache License, Version 2.0 (the "License");
+//    you may not use this file except in compliance with the License.
+//    You may obtain a copy of the License at
+//
+//        http://www.apache.org/licenses/LICENSE-2.0
+//
+//    Unless required by applicable law or agreed to in writing, software
+//    distributed under the License is distributed on an "AS IS" BASIS,
+//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//    See the License for the specific language governing permissions and
+//    limitations under the License.
+//
+package org.msgpack.jackson.dataformat;
+
+import java.lang.reflect.Field;
+import java.util.function.Supplier;
+
+public final class JavaInfo
+{
+    static final Supplier<Boolean> STRING_VALUE_FIELD_IS_CHARS;
+    static {
+        boolean stringValueFieldIsChars = false;
+        try {
+            Field stringValueField = String.class.getDeclaredField("value");
+            stringValueFieldIsChars = stringValueField.getType() == char[].class;
+        }
+        catch (NoSuchFieldException ignored) {
+        }
+        if (stringValueFieldIsChars) {
+            STRING_VALUE_FIELD_IS_CHARS = () -> true;
+        }
+        else {
+            STRING_VALUE_FIELD_IS_CHARS = () -> false;
+        }
+    }
+
+    private JavaInfo() {}
+}

msgpack-jackson/src/main/java/org/msgpack/jackson/dataformat/MessagePackExtensionType.java

@@ -1,7 +1,6 @@
 package org.msgpack.jackson.dataformat;
 
 import com.fasterxml.jackson.core.JsonGenerator;
-import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.JsonSerializer;
 import com.fasterxml.jackson.databind.SerializerProvider;
 import com.fasterxml.jackson.databind.annotation.JsonSerialize;
@@ -52,7 +51,7 @@ public boolean equals(Object o)
     @Override
     public int hashCode()
     {
-        int result = (int) type;
+        int result = type;
         result = 31 * result + Arrays.hashCode(data);
         return result;
     }
@@ -61,7 +60,7 @@ public static class Serializer extends JsonSerializer<MessagePackExtensionType>
     {
         @Override
         public void serialize(MessagePackExtensionType value, JsonGenerator gen, SerializerProvider serializers)
-                throws IOException, JsonProcessingException
+                throws IOException
         {
             if (gen instanceof MessagePackGenerator) {
                 MessagePackGenerator msgpackGenerator = (MessagePackGenerator) gen;

msgpack-jackson/src/main/java/org/msgpack/jackson/dataformat/MessagePackFactory.java

@@ -18,7 +18,6 @@
 import com.fasterxml.jackson.core.JsonEncoding;
 import com.fasterxml.jackson.core.JsonFactory;
 import com.fasterxml.jackson.core.JsonGenerator;
-import com.fasterxml.jackson.core.JsonParseException;
 import com.fasterxml.jackson.core.JsonParser;
 import com.fasterxml.jackson.core.io.IOContext;
 import org.msgpack.core.MessagePack;
@@ -97,22 +96,21 @@ public JsonGenerator createGenerator(File f, JsonEncoding enc)
 
     @Override
     public JsonGenerator createGenerator(Writer w)
-            throws IOException
     {
         throw new UnsupportedOperationException();
     }
 
     @Override
     public JsonParser createParser(byte[] data)
-            throws IOException, JsonParseException
+            throws IOException
     {
         IOContext ioContext = _createContext(data, false);
         return _createParser(data, 0, data.length, ioContext);
     }
 
     @Override
     public JsonParser createParser(InputStream in)
-            throws IOException, JsonParseException
+            throws IOException
     {
         IOContext ioContext = _createContext(in, false);
         return _createParser(in, ioContext);
@@ -131,7 +129,7 @@ protected MessagePackParser _createParser(InputStream in, IOContext ctxt)
 
     @Override
     protected JsonParser _createParser(byte[] data, int offset, int len, IOContext ctxt)
-            throws IOException, JsonParseException
+            throws IOException
     {
         if (offset != 0 || len != data.length) {
             data = Arrays.copyOfRange(data, offset, offset + len);
@@ -155,12 +153,6 @@ MessagePack.PackerConfig getPackerConfig()
         return packerConfig;
     }
 
-    @VisibleForTesting
-    boolean isReuseResourceInGenerator()
-    {
-        return reuseResourceInGenerator;
-    }
-
     @VisibleForTesting
     boolean isReuseResourceInParser()
     {
@@ -178,4 +170,10 @@ public String getFormatName()
     {
         return "msgpack";
     }
+
+    @Override
+    public boolean canHandleBinaryNatively()
+    {
+        return true;
+    }
 }