DATACMNS-332 - Performance improvements in conversion subsystem hotspots.

Added caching to DefaultTypeMapper, SimpleTypeInformationMapper, BasicPersistentEntity and PreferredConstructor as these seem to be performance hotspots on the reading side of object conversion.

src/test/java/org/springframework/data/convert/DefaultTypeMapperUnitTests.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright 2013 the original author or authors.
+ *
+ * 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.springframework.data.convert;
+
+import static org.hamcrest.CoreMatchers.*;
+import static org.junit.Assert.*;
+import static org.mockito.Mockito.*;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Map;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+import org.springframework.data.util.ClassTypeInformation;
+import org.springframework.data.util.TypeInformation;
+
+/**
+ * Unit tests for {@link DefaultTypeMapper}.
+ * 
+ * @author Oliver Gierke
+ */
+@RunWith(MockitoJUnitRunner.class)
+public class DefaultTypeMapperUnitTests {
+
+	static final String STRING = String.class.getName();
+
+	@Mock
+	TypeAliasAccessor<Map<String, String>> accessor;
+
+	@Mock
+	TypeInformationMapper mapper;
+
+	TypeMapper<Map<String, String>> typeMapper;
+	Map<String, String> source;
+
+	@Before
+	@SuppressWarnings({ "rawtypes", "unchecked" })
+	public void setUp() {
+
+		this.typeMapper = new DefaultTypeMapper<Map<String, String>>(accessor, Arrays.asList(mapper));
+		this.source = Collections.singletonMap("key", STRING);
+
+		when(accessor.readAliasFrom(source)).thenReturn(STRING);
+		when(mapper.resolveTypeFrom(STRING)).thenReturn((TypeInformation) ClassTypeInformation.from(String.class));
+	}
+
+	@Test
+	@SuppressWarnings("rawtypes")
+	public void cachesResolvedTypeInformation() {
+
+		TypeInformation<?> information = typeMapper.readType(source);
+		assertThat(information, is((TypeInformation) ClassTypeInformation.from(String.class)));
+		verify(mapper, times(1)).resolveTypeFrom(STRING);
+
+		typeMapper.readType(source);
+		verify(mapper, times(1)).resolveTypeFrom(STRING);
+	}
+}

src/test/java/org/springframework/data/convert/SimpleTypeInformationMapperUnitTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 the original author or authors.
+ * Copyright 2012-2013 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,6 +23,7 @@ import org.springframework.data.util.ClassTypeInformation;
 import org.springframework.data.util.TypeInformation;
 
 /**
+ * Unit tests for {@link SimpleTypeInformationMapper}.
  * 
  * @author Oliver Gierke
  */