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JMH benchmark comparing default method handling strategies for Mapper…
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mybatis/mybatis-3#1754
mybatis/mybatis-3#1929
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@harawata
harawata committed May 17, 2020
1 parent 19d5570 commit 6b7528f
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21 changes: 21 additions & 0 deletions gh-1929/README.md
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JMH benchmark comparing default method handling strategies for MapperProxy.

https://github.com/mybatis/mybatis-3/issues/1754
https://github.com/mybatis/mybatis-3/issues/1929

```sh
$ svn export https://github.com/harawata/mybatis-issues/trunk/gh-1929
$ cd gh-1929
$ mvn clean install
$ java -jar target/benchmarks.jar
```

The result on JDK 1.8.0_211 (macOS)

```
Benchmark Mode Cnt Score Error Units
MyBenchmark.invokeDefaultMethod thrpt 25 3.223 ± 0.712 ops/s
MyBenchmark.invokeDefaultMethodWithCache thrpt 25 2217.516 ± 109.955 ops/s
MyBenchmark.invokeDefaultMethodWithCacheWithPreCheck thrpt 25 2262.707 ± 119.406 ops/s
```

172 changes: 172 additions & 0 deletions gh-1929/pom.xml
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<!--
Copyright (c) 2014, Oracle America, Inc.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of Oracle nor the names of its contributors may be used
to endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
THE POSSIBILITY OF SUCH DAMAGE.
-->

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>net.harawata.jmh</groupId>
<artifactId>gh-1929</artifactId>
<version>1.0</version>
<packaging>jar</packaging>

<name>JMH benchmark sample: Java</name>

<!--
This is the demo/sample template build script for building Java benchmarks with JMH.
Edit as needed.
-->

<dependencies>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>${jmh.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-annprocess</artifactId>
<version>${jmh.version}</version>
<scope>provided</scope>
</dependency>
</dependencies>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

<!--
JMH version to use with this project.
-->
<jmh.version>1.22</jmh.version>

<!--
Java source/target to use for compilation.
-->
<javac.target>1.8</javac.target>

<!--
Name of the benchmark Uber-JAR to generate.
-->
<uberjar.name>benchmarks</uberjar.name>
</properties>

<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
<configuration>
<compilerVersion>${javac.target}</compilerVersion>
<source>${javac.target}</source>
<target>${javac.target}</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.2.1</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<finalName>${uberjar.name}</finalName>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>org.openjdk.jmh.Main</mainClass>
</transformer>
<transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
</transformers>
<filters>
<filter>
<!--
Shading signed JARs will fail without this.
http://stackoverflow.com/questions/999489/invalid-signature-file-when-attempting-to-run-a-jar
-->
<artifact>*:*</artifact>
<excludes>
<exclude>META-INF/*.SF</exclude>
<exclude>META-INF/*.DSA</exclude>
<exclude>META-INF/*.RSA</exclude>
</excludes>
</filter>
</filters>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
<pluginManagement>
<plugins>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>2.5</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.1</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.1</version>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
</plugin>
<plugin>
<artifactId>maven-javadoc-plugin</artifactId>
<version>2.9.1</version>
</plugin>
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>2.6</version>
</plugin>
<plugin>
<artifactId>maven-site-plugin</artifactId>
<version>3.3</version>
</plugin>
<plugin>
<artifactId>maven-source-plugin</artifactId>
<version>2.2.1</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.17</version>
</plugin>
</plugins>
</pluginManagement>
</build>

</project>
97 changes: 97 additions & 0 deletions gh-1929/src/main/java/net/harawata/jmh/MyBenchmark.java
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package net.harawata.jmh;

import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.invoke.MethodHandles.Lookup;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Level;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;

public class MyBenchmark {
@State(Scope.Thread)
public static class MyState {
public int ALLOWED_MODES = MethodHandles.Lookup.PRIVATE | MethodHandles.Lookup.PROTECTED
| MethodHandles.Lookup.PACKAGE | MethodHandles.Lookup.PUBLIC;
public Constructor<Lookup> lookupConstructor;
public Method privateLookupInMethod;
public Method method;

@Setup(Level.Trial)
public void setup() throws Exception {
Method privateLookupIn;
try {
privateLookupIn = MethodHandles.class.getMethod("privateLookupIn", Class.class, MethodHandles.Lookup.class);
} catch (NoSuchMethodException e) {
privateLookupIn = null;
}
privateLookupInMethod = privateLookupIn;

Constructor<Lookup> lookup = null;
if (privateLookupInMethod == null) {
// JDK 1.8
try {
lookup = MethodHandles.Lookup.class.getDeclaredConstructor(Class.class, int.class);
lookup.setAccessible(true);
} catch (NoSuchMethodException e) {
throw new IllegalStateException(
"There is neither 'privateLookupIn(Class, Lookup)' nor 'Lookup(Class, int)' method in java.lang.invoke.MethodHandles.",
e);
} catch (Throwable t) {
lookup = null;
}
}
lookupConstructor = lookup;
method = FooMapper.class.getMethod("count", String.class);
}
}

@Benchmark
public Object invokeDefaultMethod(MyState state) throws Throwable {
FooMapper mapper = (FooMapper) Proxy.newProxyInstance(FooMapper.class.getClassLoader(),
new Class[] { FooMapper.class },
new TestInvocationHandler());
int sum = 0;
for (int i =0; i< 1000; i++) {
sum+= mapper.count("a");
}
return sum;
}

@Benchmark
public Object invokeDefaultMethodWithCache(MyState state) throws Throwable {
FooMapper mapper = (FooMapper) Proxy.newProxyInstance(FooMapper.class.getClassLoader(),
new Class[] { FooMapper.class },
new TestInvocationHandlerCached());
int sum = 0;
for (int i =0; i< 1000; i++) {
sum+= mapper.count("a");
}
return sum;
}

@Benchmark
public Object invokeDefaultMethodWithCacheWithPreCheck(MyState state) throws Throwable {
FooMapper mapper = (FooMapper) Proxy.newProxyInstance(FooMapper.class.getClassLoader(),
new Class[] { FooMapper.class },
new TestInvocationHandlerCacheWithPreCheck());
int sum = 0;
for (int i =0; i< 1000; i++) {
sum+= mapper.count("a");
}
return sum;
}

interface FooMapper {
default int count(String s) {
return 1;
}
}
}
67 changes: 67 additions & 0 deletions gh-1929/src/main/java/net/harawata/jmh/TestInvocationHandler.java
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package net.harawata.jmh;

import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodHandles.Lookup;
import java.lang.invoke.MethodType;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

public class TestInvocationHandler implements InvocationHandler {
private static final int ALLOWED_MODES = MethodHandles.Lookup.PRIVATE | MethodHandles.Lookup.PROTECTED
| MethodHandles.Lookup.PACKAGE | MethodHandles.Lookup.PUBLIC;
private static final Constructor<Lookup> lookupConstructor;
private static final Method privateLookupInMethod;

static {
Method privateLookupIn;
try {
privateLookupIn = MethodHandles.class.getMethod("privateLookupIn", Class.class, MethodHandles.Lookup.class);
} catch (NoSuchMethodException e) {
privateLookupIn = null;
}
privateLookupInMethod = privateLookupIn;

Constructor<Lookup> lookup = null;
if (privateLookupInMethod == null) {
// JDK 1.8
try {
lookup = MethodHandles.Lookup.class.getDeclaredConstructor(Class.class, int.class);
lookup.setAccessible(true);
} catch (NoSuchMethodException e) {
throw new IllegalStateException(
"There is neither 'privateLookupIn(Class, Lookup)' nor 'Lookup(Class, int)' method in java.lang.invoke.MethodHandles.",
e);
} catch (Throwable t) {
lookup = null;
}
}
lookupConstructor = lookup;
}

@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (privateLookupInMethod == null) {
return invokeDefaultMethodJava8(proxy, method, args);
} else {
return invokeDefaultMethodJava9(proxy, method, args);
}
}

private Object invokeDefaultMethodJava9(Object proxy, Method method, Object[] args)
throws Throwable {
final Class<?> declaringClass = method.getDeclaringClass();
return ((Lookup) privateLookupInMethod.invoke(null, declaringClass, MethodHandles.lookup()))
.findSpecial(declaringClass, method.getName(),
MethodType.methodType(method.getReturnType(), method.getParameterTypes()), declaringClass)
.bindTo(proxy).invokeWithArguments(args);
}

private Object invokeDefaultMethodJava8(Object proxy, Method method, Object[] args)
throws Throwable {
final Class<?> declaringClass = method.getDeclaringClass();
return lookupConstructor.newInstance(declaringClass, ALLOWED_MODES).unreflectSpecial(method, declaringClass)
.bindTo(proxy).invokeWithArguments(args);
}
}

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