1、背景
笔者经常把一些经常使用的数据放到redis缓存，方便程序进行读取。
比如按照不同的键名将数值存储到hash值类型中。示例如下
hash hashkey hashValue
snapshot 999 "{\"id\":999,\"distId\":999,\"distName\":\"玄武区\",\"confirm\":7,\"suspect\":0,\"dead\":0,\"heal\":2,\"weight\":6.6,\"level\":\"area\",\"mapId\":\"c320100_2\",\"updateTime\":\"2020-03-03 07:20:39\"}"
snapshot1 999 {"confirm":7,"dead":0,"heal":2,"weight":6.6,"mapId":"c320100_2","updateTime":"2020-03-03 07:20:39","name":"玄武区"}
以上数据分别2052条
分别将snapshot1，snapshot转换成实体，现在将对他们进行基准测试，以评测两种存储方式的性能差异
2、基准测试
2个独立进程，分别依1次热身/热加载，批量执行20次，总计40次
2.1、snapshot1相关测试
这里用的实体转换框架是ModelMapper，官网：http://modelmapper.org/ 其性能比较高，主要用于实体属性之间的拷贝，
是笔者工作中项目实践中通过对比，选择到的这个框架。
maven依赖
<dependency>
<groupId>org.modelmapper</groupId>
<artifactId>modelmapper</artifactId>
<version>0.7.7</version>
</dependency>
以下modelMapper转换成实体代码要加
modelMapper.getConfiguration().setMatchingStrategy(MatchingStrategies.STRICT);
不同的方法会影响基准测试的最终结果
@Benchmark
public void testMapToPojo()
{
ModelMapper modelMapper = new ModelMapper();
Map<String, Map> map = cacheService.getCacheMap("snapshot1");
Map<String,SnapShot> result = new HashMap<>();
for(Iterator<Map.Entry<String, Map>> it = map.entrySet().iterator(); it.hasNext();)
{
Map.Entry<String, Map> entry = it.next();
String key = entry.getKey();
SnapShot snapshot = modelMapper.map(entry, SnapShot.class);
result.put(key, snapshot);
}
}
/**
* 获得缓存的Map
*
* @param key
* @return
*/
@Override
public <T> Map<String, T> getCacheMap(String key) {
Map<String, T> map = redisTemplate.opsForHash().entries(key);
return map;
}
测试日志：
D:\develop\java\jdk1.8.0_181\bin\java.exe "-javaagent:D:\Program Files\JetBrains\IntelliJ IDEA 2018.3.4\lib\idea_rt.jar=52204:D:\Program Files\JetBrains\IntelliJ IDEA 2018.3.4\bin" -Dfile.encoding=UTF-8 -classpath D:\develop\java\jdk1.8.0_181\jre\lib\charsets.jar;D:\develop\java\jdk1.8.0_181\jre\lib\deploy.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\access-bridge-64.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\cldrdata.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\dnsns.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\jaccess.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\jfxrt.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\localedata.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\nashorn.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\sunec.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\sunjce_provider.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\sunmscapi.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\sunpkcs11.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\zipfs.jar;D:\develop\java\jdk1.8.0_181\jre\lib\javaws.jar;D:\develop\java\jdk1.8.0_181\jre\lib\jce.jar;D:\develop\java\jdk1.8.0_181\jre\lib\jfr.jar;D:\develop\java\jdk1.8.0_181\jre\lib\jfxswt.jar;D:\develop\java\jdk1.8.0_181\jre\lib\jsse.jar;D:\develop\java\jdk1.8.0_181\jre\lib\management-agent.jar;D:\develop\java\jdk1.8.0_181\jre\lib\plugin.jar;D:\develop\java\jdk1.8.0_181\jre\lib\resources.jar;D:\develop\java\jdk1.8.0_181\jre\lib\rt.jar;E:\project\java\springBootJmh\target\test-classes;E:\project\java\springBootJmh\target\classes;D:\develop\apache-maven-3.5.4\repo\org\apache\commons\commons-pool2\2.5.0\commons-pool2-2.5.0.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\boot\spring-boot-starter-cache\2.2.4.RELEASE\spring-boot-starter-cache-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\boot\spring-boot-starter\2.2.4.RELEASE\spring-boot-starter-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\boot\spring-boot\2.2.4.RELEASE\spring-boot-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\boot\spring-boot-autoconfigure\2.2.4.RELEASE\spring-boot-autoconfigure-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\boot\spring-boot-starter-logging\2.2.4.RELEASE\spring-boot-starter-logging-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;D:\develop\apache-maven-3.5.4\repo\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;D:\develop\apache-maven-3.5.4\repo\org\apache\logging\log4j\log4j-to-slf4j\2.12.1\log4j-to-slf4j-2.12.1.jar;D:\develop\apache-maven-3.5.4\repo\org\apache\logging\log4j\log4j-api\2.12.1\log4j-api-2.12.1.jar;D:\develop\apache-maven-3.5.4\repo\org\slf4j\jul-to-slf4j\1.7.30\jul-to-slf4j-1.7.30.jar;D:\develop\apache-maven-3.5.4\repo\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;D:\develop\apache-maven-3.5.4\repo\org\yaml\snakeyaml\1.25\snakeyaml-1.25.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-context-support\5.2.3.RELEASE\spring-context-support-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-beans\5.2.3.RELEASE\spring-beans-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-context\5.2.3.RELEASE\spring-context-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-expression\5.2.3.RELEASE\spring-expression-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\boot\spring-boot-starter-data-redis\2.2.4.RELEASE\spring-boot-starter-data-redis-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\data\spring-data-redis\2.2.4.RELEASE\spring-data-redis-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\data\spring-data-keyvalue\2.2.4.RELEASE\spring-data-keyvalue-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\data\spring-data-commons\2.2.4.RELEASE\spring-data-commons-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-tx\5.2.3.RELEASE\spring-tx-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-oxm\5.2.3.RELEASE\spring-oxm-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-aop\5.2.3.RELEASE\spring-aop-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\slf4j\slf4j-api\1.7.30\slf4j-api-1.7.30.jar;D:\develop\apache-maven-3.5.4\repo\io\lettuce\lettuce-core\5.2.1.RELEASE\lettuce-core-5.2.1.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\io\netty\netty-common\4.1.45.Final\netty-common-4.1.45.Final.jar;D:\develop\apache-maven-3.5.4\repo\io\netty\netty-handler\4.1.45.Final\netty-handler-4.1.45.Final.jar;D:\develop\apache-maven-3.5.4\repo\io\netty\netty-buffer\4.1.45.Final\netty-buffer-4.1.45.Final.jar;D:\develop\apache-maven-3.5.4\repo\io\netty\netty-codec\4.1.45.Final\netty-codec-4.1.45.Final.jar;D:\develop\apache-maven-3.5.4\repo\io\netty\netty-transport\4.1.45.Final\netty-transport-4.1.45.Final.jar;D:\develop\apache-maven-3.5.4\repo\io\netty\netty-resolver\4.1.45.Final\netty-resolver-4.1.45.Final.jar;D:\develop\apache-maven-3.5.4\repo\io\projectreactor\reactor-core\3.3.2.RELEASE\reactor-core-3.3.2.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\reactivestreams\reactive-streams\1.0.3\reactive-streams-1.0.3.jar;D:\develop\apache-maven-3.5.4\repo\com\dyuproject\protostuff\protostuff-runtime\1.1.3\protostuff-runtime-1.1.3.jar;D:\develop\apache-maven-3.5.4\repo\com\dyuproject\protostuff\protostuff-collectionschema\1.1.3\protostuff-collectionschema-1.1.3.jar;D:\develop\apache-maven-3.5.4\repo\com\dyuproject\protostuff\protostuff-api\1.0.8\protostuff-api-1.0.8.jar;D:\develop\apache-maven-3.5.4\repo\com\dyuproject\protostuff\protostuff-core\1.0.8\protostuff-core-1.0.8.jar;D:\develop\apache-maven-3.5.4\repo\org\projectlombok\lombok\1.18.10\lombok-1.18.10.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\boot\spring-boot-starter-test\2.2.4.RELEASE\spring-boot-starter-test-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\boot\spring-boot-test\2.2.4.RELEASE\spring-boot-test-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\boot\spring-boot-test-autoconfigure\2.2.4.RELEASE\spring-boot-test-autoconfigure-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\com\jayway\jsonpath\json-path\2.4.0\json-path-2.4.0.jar;D:\develop\apache-maven-3.5.4\repo\net\minidev\json-smart\2.3\json-smart-2.3.jar;D:\develop\apache-maven-3.5.4\repo\net\minidev\accessors-smart\1.2\accessors-smart-1.2.jar;D:\develop\apache-maven-3.5.4\repo\org\ow2\asm\asm\5.0.4\asm-5.0.4.jar;D:\develop\apache-maven-3.5.4\repo\jakarta\xml\bind\jakarta.xml.bind-api\2.3.2\jakarta.xml.bind-api-2.3.2.jar;D:\develop\apache-maven-3.5.4\repo\jakarta\activation\jakarta.activation-api\1.2.1\jakarta.activation-api-1.2.1.jar;D:\develop\apache-maven-3.5.4\repo\org\junit\jupiter\junit-jupiter\5.5.2\junit-jupiter-5.5.2.jar;D:\develop\apache-maven-3.5.4\repo\org\junit\jupiter\junit-jupiter-api\5.5.2\junit-jupiter-api-5.5.2.jar;D:\develop\apache-maven-3.5.4\repo\org\apiguardian\apiguardian-api\1.1.0\apiguardian-api-1.1.0.jar;D:\develop\apache-maven-3.5.4\repo\org\opentest4j\opentest4j\1.2.0\opentest4j-1.2.0.jar;D:\develop\apache-maven-3.5.4\repo\org\junit\platform\junit-platform-commons\1.5.2\junit-platform-commons-1.5.2.jar;D:\develop\apache-maven-3.5.4\repo\org\junit\jupiter\junit-jupiter-params\5.5.2\junit-jupiter-params-5.5.2.jar;D:\develop\apache-maven-3.5.4\repo\org\junit\jupiter\junit-jupiter-engine\5.5.2\junit-jupiter-engine-5.5.2.jar;D:\develop\apache-maven-3.5.4\repo\org\junit\platform\junit-platform-engine\1.5.2\junit-platform-engine-1.5.2.jar;D:\develop\apache-maven-3.5.4\repo\org\mockito\mockito-junit-jupiter\3.1.0\mockito-junit-jupiter-3.1.0.jar;D:\develop\apache-maven-3.5.4\repo\org\assertj\assertj-core\3.13.2\assertj-core-3.13.2.jar;D:\develop\apache-maven-3.5.4\repo\org\hamcrest\hamcrest\2.1\hamcrest-2.1.jar;D:\develop\apache-maven-3.5.4\repo\org\mockito\mockito-core\3.1.0\mockito-core-3.1.0.jar;D:\develop\apache-maven-3.5.4\repo\net\bytebuddy\byte-buddy\1.10.6\byte-buddy-1.10.6.jar;D:\develop\apache-maven-3.5.4\repo\net\bytebuddy\byte-buddy-agent\1.10.6\byte-buddy-agent-1.10.6.jar;D:\develop\apache-maven-3.5.4\repo\org\objenesis\objenesis\2.6\objenesis-2.6.jar;D:\develop\apache-maven-3.5.4\repo\org\skyscreamer\jsonassert\1.5.0\jsonassert-1.5.0.jar;D:\develop\apache-maven-3.5.4\repo\com\vaadin\external\google\android-json\0.0.20131108.vaadin1\android-json-0.0.20131108.vaadin1.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-core\5.2.3.RELEASE\spring-core-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-jcl\5.2.3.RELEASE\spring-jcl-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-test\5.2.3.RELEASE\spring-test-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\xmlunit\xmlunit-core\2.6.3\xmlunit-core-2.6.3.jar;D:\develop\apache-maven-3.5.4\repo\com\google\guava\guava\20.0\guava-20.0.jar;D:\develop\apache-maven-3.5.4\repo\com\google\code\gson\gson\2.8.4\gson-2.8.4.jar;D:\develop\apache-maven-3.5.4\repo\org\modelmapper\modelmapper\0.7.7\modelmapper-0.7.7.jar;D:\develop\apache-maven-3.5.4\repo\org\openjdk\jmh\jmh-core\1.21\jmh-core-1.21.jar;D:\develop\apache-maven-3.5.4\repo\net\sf\jopt-simple\jopt-simple\4.6\jopt-simple-4.6.jar;D:\develop\apache-maven-3.5.4\repo\org\apache\commons\commons-math3\3.2\commons-math3-3.2.jar;D:\develop\apache-maven-3.5.4\repo\org\openjdk\jmh\jmh-generator-annprocess\1.21\jmh-generator-annprocess-1.21.jar;D:\develop\apache-maven-3.5.4\repo\com\fasterxml\jackson\core\jackson-annotations\2.10.2\jackson-annotations-2.10.2.jar;D:\develop\apache-maven-3.5.4\repo\com\fasterxml\jackson\core\jackson-databind\2.10.2\jackson-databind-2.10.2.jar;D:\develop\apache-maven-3.5.4\repo\com\fasterxml\jackson\core\jackson-core\2.10.2\jackson-core-2.10.2.jar;D:\develop\apache-maven-3.5.4\repo\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.10.2\jackson-datatype-jsr310-2.10.2.jar;D:\develop\apache-maven-3.5.4\repo\commons-beanutils\commons-beanutils\1.9.3\commons-beanutils-1.9.3.jar;D:\develop\apache-maven-3.5.4\repo\commons-logging\commons-logging\1.2\commons-logging-1.2.jar;D:\develop\apache-maven-3.5.4\repo\commons-collections\commons-collections\3.2.2\commons-collections-3.2.2.jar;D:\develop\apache-maven-3.5.4\repo\junit\junit\4.12\junit-4.12.jar;D:\develop\apache-maven-3.5.4\repo\org\hamcrest\hamcrest-core\2.1\hamcrest-core-2.1.jar com.springboot.AppTest
# JMH version: 1.21
# VM version: JDK 1.8.0_181, Java HotSpot(TM) 64-Bit Server VM, 25.181-b13
# VM invoker: D:\develop\java\jdk1.8.0_181\jre\bin\java.exe
# VM options: -javaagent:D:\Program Files\JetBrains\IntelliJ IDEA 2018.3.4\lib\idea_rt.jar=52204:D:\Program Files\JetBrains\IntelliJ IDEA 2018.3.4\bin -Dfile.encoding=UTF-8
# Warmup: 1 iterations, 10 s each
# Measurement: 20 iterations, 10 s each
# Timeout: 10 min per iteration
# Threads: 1 thread, will synchronize iterations
# Benchmark mode: Average time, time/op
# Benchmark: com.springboot.AppTest.testMapToPojo
# Run progress: 0.00% complete, ETA 00:07:00
# Fork: 1 of 2
# Warmup Iteration 1: LOGBACK: No context given for c.q.l.core.rolling.SizeAndTimeBasedRollingPolicy@999543437
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.2.4.RELEASE)
2020-03-04 10:39:47.875 INFO 10892 --- [jo-jmh-worker-1] o.s.boot.SpringApplication : Starting application on DESKTOP-AJTC6JT with PID 10892 (started by Administrator in E:\project\java\springBootJmh)
2020-03-04 10:39:47.880 INFO 10892 --- [jo-jmh-worker-1] o.s.boot.SpringApplication : No active profile set, falling back to default profiles: default
2020-03-04 10:39:48.380 INFO 10892 --- [jo-jmh-worker-1] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode!
2020-03-04 10:39:48.384 INFO 10892 --- [jo-jmh-worker-1] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data Redis repositories in DEFAULT mode.
2020-03-04 10:39:48.417 INFO 10892 --- [jo-jmh-worker-1] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 19ms. Found 0 Redis repository interfaces.
2020-03-04 10:39:49.420 INFO 10892 --- [jo-jmh-worker-1] o.s.boot.SpringApplication : Started application in 2.007 seconds (JVM running for 2.878)
2020-03-04 10:39:49.704 INFO 10892 --- [jo-jmh-worker-1] io.lettuce.core.EpollProvider : Starting without optional epoll library
2020-03-04 10:39:49.705 INFO 10892 --- [jo-jmh-worker-1] io.lettuce.core.KqueueProvider : Starting without optional kqueue library
4.977 ms/op
Iteration 1: 4.245 ms/op
Iteration 2: 4.212 ms/op
Iteration 3: 4.223 ms/op
Iteration 4: 4.372 ms/op
Iteration 5: 4.472 ms/op
Iteration 6: 4.559 ms/op
Iteration 7: 4.569 ms/op
Iteration 8: 4.393 ms/op
Iteration 9: 4.357 ms/op
Iteration 10: 4.218 ms/op
Iteration 11: 4.273 ms/op
Iteration 12: 4.372 ms/op
Iteration 13: 4.274 ms/op
Iteration 14: 4.194 ms/op
Iteration 15: 4.198 ms/op
Iteration 16: 4.177 ms/op
Iteration 17: 4.175 ms/op
Iteration 18: 4.180 ms/op
Iteration 19: 4.181 ms/op
Iteration 20: 4.185 ms/op
# Run progress: 50.00% complete, ETA 00:03:33
# Fork: 2 of 2
# Warmup Iteration 1: LOGBACK: No context given for c.q.l.core.rolling.SizeAndTimeBasedRollingPolicy@142500488
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.2.4.RELEASE)
2020-03-04 10:43:21.156 INFO 5872 --- [jo-jmh-worker-1] o.s.boot.SpringApplication : Starting application on DESKTOP-AJTC6JT with PID 5872 (started by Administrator in E:\project\java\springBootJmh)
2020-03-04 10:43:21.159 INFO 5872 --- [jo-jmh-worker-1] o.s.boot.SpringApplication : No active profile set, falling back to default profiles: default
2020-03-04 10:43:21.571 INFO 5872 --- [jo-jmh-worker-1] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode!
2020-03-04 10:43:21.574 INFO 5872 --- [jo-jmh-worker-1] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data Redis repositories in DEFAULT mode.
2020-03-04 10:43:21.600 INFO 5872 --- [jo-jmh-worker-1] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 14ms. Found 0 Redis repository interfaces.
2020-03-04 10:43:22.461 INFO 5872 --- [jo-jmh-worker-1] o.s.boot.SpringApplication : Started application in 1.646 seconds (JVM running for 2.298)
2020-03-04 10:43:22.720 INFO 5872 --- [jo-jmh-worker-1] io.lettuce.core.EpollProvider : Starting without optional epoll library
2020-03-04 10:43:22.722 INFO 5872 --- [jo-jmh-worker-1] io.lettuce.core.KqueueProvider : Starting without optional kqueue library
4.919 ms/op
Iteration 1: 4.240 ms/op
Iteration 2: 4.222 ms/op
Iteration 3: 4.188 ms/op
Iteration 4: 4.183 ms/op
Iteration 5: 4.188 ms/op
Iteration 6: 4.179 ms/op
Iteration 7: 4.210 ms/op
Iteration 8: 4.185 ms/op
Iteration 9: 4.409 ms/op
Iteration 10: 4.203 ms/op
Iteration 11: 4.219 ms/op
Iteration 12: 4.225 ms/op
Iteration 13: 4.333 ms/op
Iteration 14: 4.302 ms/op
Iteration 15: 4.240 ms/op
Iteration 16: 4.222 ms/op
Iteration 17: 4.297 ms/op
Iteration 18: 4.253 ms/op
Iteration 19: 4.243 ms/op
Iteration 20: 4.308 ms/op
Result "com.springboot.AppTest.testMapToPojo":
4.267 ±(99.9%) 0.057 ms/op [Average]
(min, avg, max) = (4.175, 4.267, 4.569), stdev = 0.101
CI (99.9%): [4.210, 4.324] (assumes normal distribution)
# Run complete. Total time: 00:07:06
REMEMBER: The numbers below are just data. To gain reusable insights, you need to follow up on
why the numbers are the way they are. Use profilers (see -prof, -lprof), design factorial
experiments, perform baseline and negative tests that provide experimental control, make sure
the benchmarking environment is safe on JVM/OS/HW level, ask for reviews from the domain experts.
Do not assume the numbers tell you what you want them to tell.
Benchmark Mode Cnt Score Error Units
AppTest.testMapToPojo avgt 40 4.267 ± 0.057 ms/op
Process finished with exit code 0
结果：40次基准测试，最小（最理想）4.175毫秒，均值 4.267毫秒，最大值（最坏情况）4.569毫秒
2.2、snapshot测试
@Benchmark
public void testGetPojo()
{
Map<String, SnapShot> map = cacheService.getCacheMap("snapshot", SnapShot.class);
}
@Override
public <T> Map<String, T> getCacheMap(String key, Class<T> clazz) {
Map<String, String> raw = redisTemplate.opsForHash().entries(key);
Map<String, T> map = Maps.newLinkedHashMapWithExpectedSize(raw.size());
for (Map.Entry<String, String> entry : raw.entrySet()) {
String hashKey = entry.getKey();
String value = entry.getValue();
map.put(hashKey, gson.fromJson(value, clazz));
}
return map;
}
测试日志：
D:\develop\java\jdk1.8.0_181\bin\java.exe "-javaagent:D:\Program Files\JetBrains\IntelliJ IDEA 2018.3.4\lib\idea_rt.jar=52899:D:\Program Files\JetBrains\IntelliJ IDEA 2018.3.4\bin" -Dfile.encoding=UTF-8 -classpath D:\develop\java\jdk1.8.0_181\jre\lib\charsets.jar;D:\develop\java\jdk1.8.0_181\jre\lib\deploy.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\access-bridge-64.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\cldrdata.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\dnsns.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\jaccess.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\jfxrt.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\localedata.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\nashorn.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\sunec.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\sunjce_provider.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\sunmscapi.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\sunpkcs11.jar;D:\develop\java\jdk1.8.0_181\jre\lib\ext\zipfs.jar;D:\develop\java\jdk1.8.0_181\jre\lib\javaws.jar;D:\develop\java\jdk1.8.0_181\jre\lib\jce.jar;D:\develop\java\jdk1.8.0_181\jre\lib\jfr.jar;D:\develop\java\jdk1.8.0_181\jre\lib\jfxswt.jar;D:\develop\java\jdk1.8.0_181\jre\lib\jsse.jar;D:\develop\java\jdk1.8.0_181\jre\lib\management-agent.jar;D:\develop\java\jdk1.8.0_181\jre\lib\plugin.jar;D:\develop\java\jdk1.8.0_181\jre\lib\resources.jar;D:\develop\java\jdk1.8.0_181\jre\lib\rt.jar;E:\project\java\springBootJmh\target\test-classes;E:\project\java\springBootJmh\target\classes;D:\develop\apache-maven-3.5.4\repo\org\apache\commons\commons-pool2\2.5.0\commons-pool2-2.5.0.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\boot\spring-boot-starter-cache\2.2.4.RELEASE\spring-boot-starter-cache-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\boot\spring-boot-starter\2.2.4.RELEASE\spring-boot-starter-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\boot\spring-boot\2.2.4.RELEASE\spring-boot-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\boot\spring-boot-autoconfigure\2.2.4.RELEASE\spring-boot-autoconfigure-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\boot\spring-boot-starter-logging\2.2.4.RELEASE\spring-boot-starter-logging-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;D:\develop\apache-maven-3.5.4\repo\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;D:\develop\apache-maven-3.5.4\repo\org\apache\logging\log4j\log4j-to-slf4j\2.12.1\log4j-to-slf4j-2.12.1.jar;D:\develop\apache-maven-3.5.4\repo\org\apache\logging\log4j\log4j-api\2.12.1\log4j-api-2.12.1.jar;D:\develop\apache-maven-3.5.4\repo\org\slf4j\jul-to-slf4j\1.7.30\jul-to-slf4j-1.7.30.jar;D:\develop\apache-maven-3.5.4\repo\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;D:\develop\apache-maven-3.5.4\repo\org\yaml\snakeyaml\1.25\snakeyaml-1.25.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-context-support\5.2.3.RELEASE\spring-context-support-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-beans\5.2.3.RELEASE\spring-beans-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-context\5.2.3.RELEASE\spring-context-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-expression\5.2.3.RELEASE\spring-expression-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\boot\spring-boot-starter-data-redis\2.2.4.RELEASE\spring-boot-starter-data-redis-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\data\spring-data-redis\2.2.4.RELEASE\spring-data-redis-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\data\spring-data-keyvalue\2.2.4.RELEASE\spring-data-keyvalue-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\data\spring-data-commons\2.2.4.RELEASE\spring-data-commons-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-tx\5.2.3.RELEASE\spring-tx-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-oxm\5.2.3.RELEASE\spring-oxm-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-aop\5.2.3.RELEASE\spring-aop-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\slf4j\slf4j-api\1.7.30\slf4j-api-1.7.30.jar;D:\develop\apache-maven-3.5.4\repo\io\lettuce\lettuce-core\5.2.1.RELEASE\lettuce-core-5.2.1.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\io\netty\netty-common\4.1.45.Final\netty-common-4.1.45.Final.jar;D:\develop\apache-maven-3.5.4\repo\io\netty\netty-handler\4.1.45.Final\netty-handler-4.1.45.Final.jar;D:\develop\apache-maven-3.5.4\repo\io\netty\netty-buffer\4.1.45.Final\netty-buffer-4.1.45.Final.jar;D:\develop\apache-maven-3.5.4\repo\io\netty\netty-codec\4.1.45.Final\netty-codec-4.1.45.Final.jar;D:\develop\apache-maven-3.5.4\repo\io\netty\netty-transport\4.1.45.Final\netty-transport-4.1.45.Final.jar;D:\develop\apache-maven-3.5.4\repo\io\netty\netty-resolver\4.1.45.Final\netty-resolver-4.1.45.Final.jar;D:\develop\apache-maven-3.5.4\repo\io\projectreactor\reactor-core\3.3.2.RELEASE\reactor-core-3.3.2.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\reactivestreams\reactive-streams\1.0.3\reactive-streams-1.0.3.jar;D:\develop\apache-maven-3.5.4\repo\com\dyuproject\protostuff\protostuff-runtime\1.1.3\protostuff-runtime-1.1.3.jar;D:\develop\apache-maven-3.5.4\repo\com\dyuproject\protostuff\protostuff-collectionschema\1.1.3\protostuff-collectionschema-1.1.3.jar;D:\develop\apache-maven-3.5.4\repo\com\dyuproject\protostuff\protostuff-api\1.0.8\protostuff-api-1.0.8.jar;D:\develop\apache-maven-3.5.4\repo\com\dyuproject\protostuff\protostuff-core\1.0.8\protostuff-core-1.0.8.jar;D:\develop\apache-maven-3.5.4\repo\org\projectlombok\lombok\1.18.10\lombok-1.18.10.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\boot\spring-boot-starter-test\2.2.4.RELEASE\spring-boot-starter-test-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\boot\spring-boot-test\2.2.4.RELEASE\spring-boot-test-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\boot\spring-boot-test-autoconfigure\2.2.4.RELEASE\spring-boot-test-autoconfigure-2.2.4.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\com\jayway\jsonpath\json-path\2.4.0\json-path-2.4.0.jar;D:\develop\apache-maven-3.5.4\repo\net\minidev\json-smart\2.3\json-smart-2.3.jar;D:\develop\apache-maven-3.5.4\repo\net\minidev\accessors-smart\1.2\accessors-smart-1.2.jar;D:\develop\apache-maven-3.5.4\repo\org\ow2\asm\asm\5.0.4\asm-5.0.4.jar;D:\develop\apache-maven-3.5.4\repo\jakarta\xml\bind\jakarta.xml.bind-api\2.3.2\jakarta.xml.bind-api-2.3.2.jar;D:\develop\apache-maven-3.5.4\repo\jakarta\activation\jakarta.activation-api\1.2.1\jakarta.activation-api-1.2.1.jar;D:\develop\apache-maven-3.5.4\repo\org\junit\jupiter\junit-jupiter\5.5.2\junit-jupiter-5.5.2.jar;D:\develop\apache-maven-3.5.4\repo\org\junit\jupiter\junit-jupiter-api\5.5.2\junit-jupiter-api-5.5.2.jar;D:\develop\apache-maven-3.5.4\repo\org\apiguardian\apiguardian-api\1.1.0\apiguardian-api-1.1.0.jar;D:\develop\apache-maven-3.5.4\repo\org\opentest4j\opentest4j\1.2.0\opentest4j-1.2.0.jar;D:\develop\apache-maven-3.5.4\repo\org\junit\platform\junit-platform-commons\1.5.2\junit-platform-commons-1.5.2.jar;D:\develop\apache-maven-3.5.4\repo\org\junit\jupiter\junit-jupiter-params\5.5.2\junit-jupiter-params-5.5.2.jar;D:\develop\apache-maven-3.5.4\repo\org\junit\jupiter\junit-jupiter-engine\5.5.2\junit-jupiter-engine-5.5.2.jar;D:\develop\apache-maven-3.5.4\repo\org\junit\platform\junit-platform-engine\1.5.2\junit-platform-engine-1.5.2.jar;D:\develop\apache-maven-3.5.4\repo\org\mockito\mockito-junit-jupiter\3.1.0\mockito-junit-jupiter-3.1.0.jar;D:\develop\apache-maven-3.5.4\repo\org\assertj\assertj-core\3.13.2\assertj-core-3.13.2.jar;D:\develop\apache-maven-3.5.4\repo\org\hamcrest\hamcrest\2.1\hamcrest-2.1.jar;D:\develop\apache-maven-3.5.4\repo\org\mockito\mockito-core\3.1.0\mockito-core-3.1.0.jar;D:\develop\apache-maven-3.5.4\repo\net\bytebuddy\byte-buddy\1.10.6\byte-buddy-1.10.6.jar;D:\develop\apache-maven-3.5.4\repo\net\bytebuddy\byte-buddy-agent\1.10.6\byte-buddy-agent-1.10.6.jar;D:\develop\apache-maven-3.5.4\repo\org\objenesis\objenesis\2.6\objenesis-2.6.jar;D:\develop\apache-maven-3.5.4\repo\org\skyscreamer\jsonassert\1.5.0\jsonassert-1.5.0.jar;D:\develop\apache-maven-3.5.4\repo\com\vaadin\external\google\android-json\0.0.20131108.vaadin1\android-json-0.0.20131108.vaadin1.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-core\5.2.3.RELEASE\spring-core-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-jcl\5.2.3.RELEASE\spring-jcl-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\springframework\spring-test\5.2.3.RELEASE\spring-test-5.2.3.RELEASE.jar;D:\develop\apache-maven-3.5.4\repo\org\xmlunit\xmlunit-core\2.6.3\xmlunit-core-2.6.3.jar;D:\develop\apache-maven-3.5.4\repo\com\google\guava\guava\20.0\guava-20.0.jar;D:\develop\apache-maven-3.5.4\repo\com\google\code\gson\gson\2.8.4\gson-2.8.4.jar;D:\develop\apache-maven-3.5.4\repo\org\modelmapper\modelmapper\0.7.7\modelmapper-0.7.7.jar;D:\develop\apache-maven-3.5.4\repo\org\openjdk\jmh\jmh-core\1.21\jmh-core-1.21.jar;D:\develop\apache-maven-3.5.4\repo\net\sf\jopt-simple\jopt-simple\4.6\jopt-simple-4.6.jar;D:\develop\apache-maven-3.5.4\repo\org\apache\commons\commons-math3\3.2\commons-math3-3.2.jar;D:\develop\apache-maven-3.5.4\repo\org\openjdk\jmh\jmh-generator-annprocess\1.21\jmh-generator-annprocess-1.21.jar;D:\develop\apache-maven-3.5.4\repo\com\fasterxml\jackson\core\jackson-annotations\2.10.2\jackson-annotations-2.10.2.jar;D:\develop\apache-maven-3.5.4\repo\com\fasterxml\jackson\core\jackson-databind\2.10.2\jackson-databind-2.10.2.jar;D:\develop\apache-maven-3.5.4\repo\com\fasterxml\jackson\core\jackson-core\2.10.2\jackson-core-2.10.2.jar;D:\develop\apache-maven-3.5.4\repo\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.10.2\jackson-datatype-jsr310-2.10.2.jar;D:\develop\apache-maven-3.5.4\repo\commons-beanutils\commons-beanutils\1.9.3\commons-beanutils-1.9.3.jar;D:\develop\apache-maven-3.5.4\repo\commons-logging\commons-logging\1.2\commons-logging-1.2.jar;D:\develop\apache-maven-3.5.4\repo\commons-collections\commons-collections\3.2.2\commons-collections-3.2.2.jar;D:\develop\apache-maven-3.5.4\repo\junit\junit\4.12\junit-4.12.jar;D:\develop\apache-maven-3.5.4\repo\org\hamcrest\hamcrest-core\2.1\hamcrest-core-2.1.jar com.springboot.AppTest
# JMH version: 1.21
# VM version: JDK 1.8.0_181, Java HotSpot(TM) 64-Bit Server VM, 25.181-b13
# VM invoker: D:\develop\java\jdk1.8.0_181\jre\bin\java.exe
# VM options: -javaagent:D:\Program Files\JetBrains\IntelliJ IDEA 2018.3.4\lib\idea_rt.jar=52899:D:\Program Files\JetBrains\IntelliJ IDEA 2018.3.4\bin -Dfile.encoding=UTF-8
# Warmup: 1 iterations, 10 s each
# Measurement: 20 iterations, 10 s each
# Timeout: 10 min per iteration
# Threads: 1 thread, will synchronize iterations
# Benchmark mode: Average time, time/op
# Benchmark: com.springboot.AppTest.testGetPojo
# Run progress: 0.00% complete, ETA 00:07:00
# Fork: 1 of 2
# Warmup Iteration 1: LOGBACK: No context given for c.q.l.core.rolling.SizeAndTimeBasedRollingPolicy@1051164110
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.2.4.RELEASE)
2020-03-04 11:08:57.181 INFO 12868 --- [jo-jmh-worker-1] o.s.boot.SpringApplication : Starting application on DESKTOP-AJTC6JT with PID 12868 (started by Administrator in E:\project\java\springBootJmh)
2020-03-04 11:08:57.185 INFO 12868 --- [jo-jmh-worker-1] o.s.boot.SpringApplication : No active profile set, falling back to default profiles: default
2020-03-04 11:08:57.710 INFO 12868 --- [jo-jmh-worker-1] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode!
2020-03-04 11:08:57.712 INFO 12868 --- [jo-jmh-worker-1] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data Redis repositories in DEFAULT mode.
2020-03-04 11:08:57.746 INFO 12868 --- [jo-jmh-worker-1] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 21ms. Found 0 Redis repository interfaces.
2020-03-04 11:08:58.849 INFO 12868 --- [jo-jmh-worker-1] o.s.boot.SpringApplication : Started application in 2.147 seconds (JVM running for 3.097)
2020-03-04 11:08:59.086 INFO 12868 --- [jo-jmh-worker-1] io.lettuce.core.EpollProvider : Starting without optional epoll library
2020-03-04 11:08:59.087 INFO 12868 --- [jo-jmh-worker-1] io.lettuce.core.KqueueProvider : Starting without optional kqueue library
8.041 ms/op
Iteration 1: 7.019 ms/op
Iteration 2: 7.032 ms/op
Iteration 3: 7.008 ms/op
Iteration 4: 7.081 ms/op
Iteration 5: 6.997 ms/op
Iteration 6: 6.958 ms/op
Iteration 7: 6.925 ms/op
Iteration 8: 6.935 ms/op
Iteration 9: 6.943 ms/op
Iteration 10: 6.940 ms/op
Iteration 11: 6.948 ms/op
Iteration 12: 6.956 ms/op
Iteration 13: 7.033 ms/op
Iteration 14: 6.969 ms/op
Iteration 15: 6.964 ms/op
Iteration 16: 6.962 ms/op
Iteration 17: 6.962 ms/op
Iteration 18: 6.955 ms/op
Iteration 19: 6.959 ms/op
Iteration 20: 6.973 ms/op
# Run progress: 50.00% complete, ETA 00:03:33
# Fork: 2 of 2
# Warmup Iteration 1: LOGBACK: No context given for c.q.l.core.rolling.SizeAndTimeBasedRollingPolicy@1741951395
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.2.4.RELEASE)
2020-03-04 11:12:30.673 INFO 12292 --- [jo-jmh-worker-1] o.s.boot.SpringApplication : Starting application on DESKTOP-AJTC6JT with PID 12292 (started by Administrator in E:\project\java\springBootJmh)
2020-03-04 11:12:30.676 INFO 12292 --- [jo-jmh-worker-1] o.s.boot.SpringApplication : No active profile set, falling back to default profiles: default
2020-03-04 11:12:31.092 INFO 12292 --- [jo-jmh-worker-1] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode!
2020-03-04 11:12:31.094 INFO 12292 --- [jo-jmh-worker-1] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data Redis repositories in DEFAULT mode.
2020-03-04 11:12:31.121 INFO 12292 --- [jo-jmh-worker-1] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 15ms. Found 0 Redis repository interfaces.
2020-03-04 11:12:32.013 INFO 12292 --- [jo-jmh-worker-1] o.s.boot.SpringApplication : Started application in 1.678 seconds (JVM running for 2.34)
2020-03-04 11:12:32.297 INFO 12292 --- [jo-jmh-worker-1] io.lettuce.core.EpollProvider : Starting without optional epoll library
2020-03-04 11:12:32.299 INFO 12292 --- [jo-jmh-worker-1] io.lettuce.core.KqueueProvider : Starting without optional kqueue library
7.919 ms/op
Iteration 1: 7.405 ms/op
Iteration 2: 7.021 ms/op
Iteration 3: 7.133 ms/op
Iteration 4: 6.975 ms/op
Iteration 5: 6.915 ms/op
Iteration 6: 6.898 ms/op
Iteration 7: 6.934 ms/op
Iteration 8: 6.939 ms/op
Iteration 9: 6.909 ms/op
Iteration 10: 6.839 ms/op
Iteration 11: 7.037 ms/op
Iteration 12: 7.005 ms/op
Iteration 13: 7.044 ms/op
Iteration 14: 7.009 ms/op
Iteration 15: 6.941 ms/op
Iteration 16: 6.860 ms/op
Iteration 17: 6.848 ms/op
Iteration 18: 6.869 ms/op
Iteration 19: 6.893 ms/op
Iteration 20: 6.874 ms/op
Result "com.springboot.AppTest.testGetPojo":
6.972 ±(99.9%) 0.053 ms/op [Average]
(min, avg, max) = (6.839, 6.972, 7.405), stdev = 0.094
CI (99.9%): [6.919, 7.025] (assumes normal distribution)
# Run complete. Total time: 00:07:07
REMEMBER: The numbers below are just data. To gain reusable insights, you need to follow up on
why the numbers are the way they are. Use profilers (see -prof, -lprof), design factorial
experiments, perform baseline and negative tests that provide experimental control, make sure
the benchmarking environment is safe on JVM/OS/HW level, ask for reviews from the domain experts.
Do not assume the numbers tell you what you want them to tell.
Benchmark Mode Cnt Score Error Units
AppTest.testGetPojo avgt 40 6.972 ± 0.053 ms/op
Process finished with exit code 0
结果：最小值：6.839（最理想值）毫秒, 均值6.972 最大值(最坏情况)7.405
3、测试数据
3.1、数据存储方式
{"confirm":7,"dead":0,"heal":2,"weight":6.6,"mapId":"c320100_2","updateTime":"2020-03-03 07:20:39","name":"玄武区"}3.1.1 存到redis缓存中，取出来时候是在java这边是以LinkedHashMap（基于链表方式存储的Hash）
"{\"id\":999,\"distId\":999,\"distName\":\"玄武区\",\"confirm\":7,\"suspect\":0,\"dead\":0,\"heal\":2,\"weight\":6.6,\"level\":\"area\",\"mapId\":\"c320100_2\",\"updateTime\":\"2020-03-03 07:20:39\"}"3.1.2、从内存中取出来，在java这里是以String存储的
测试代码
RedisTest.java
package com.springboot;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.gson.Gson;
import com.springboot.entity.SnapShot;
import com.springboot.service.CacheService;
import org.junit.Before;
import org.junit.jupiter.api.Test;
import org.modelmapper.ModelMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.context.ConfigurableApplicationContext;
import java.util.Iterator;
import java.util.Map;
@SpringBootTest(classes = App.class)
public class RedisTest {
private ConfigurableApplicationContext context;
final Gson gson = new Gson();
ObjectMapper mapper = new ObjectMapper();
ModelMapper modelMapper = new ModelMapper();
@Autowired
CacheService cacheService;
/**
* setup初始化容器的时候只执行一次
*/
@Before
public void init(){
context = SpringApplication.run(App.class);
cacheService = context.getBean(CacheService.class);
}
@Test
public void testGetPojo()
{
Map<String, SnapShot> map = cacheService.getCacheMap("snapshot", SnapShot.class);
System.out.println(map);
cacheService.setCacheMap("snapshot1",map);
}
@Test
public void testMapToPojo()
{
Map<String, Map> map = cacheService.getCacheMap("snapshot1");
for(Iterator<Map.Entry<String, Map>> it = map.entrySet().iterator();it.hasNext();)
{
Map.Entry<String, Map> entry = it.next();
SnapShot snapshot = modelMapper.map(entry, SnapShot.class);
}
}
}
4、结论
不使用转义字符的 json形式
{"confirm":7,"dead":0,"heal":2,"weight":6.6,"mapId":"c320100_2","updateTime":"2020-03-03 07:20:39","name":"玄武区"}
比使用转义字符的json：
"{\"id\":999,\"distId\":999,\"distName\":\"玄武区\",\"confirm\":7,\"suspect\":0,\"dead\":0,\"heal\":2,\"weight\":6.6,\"level\":\"area\",\"mapId\":\"c320100_2\",\"updateTime\":\"2020-03-03 07:20:39\"}"转换成实体快。
同样的配置机器，使用不带转义字符的json形式存储，然后再用modelMapper反序列化实体， 均值快2.705毫秒，速度提升2.705/6.972=38.798%
笔者最终把上面的<T> Map<String, T> getCacheMap(String key, Class<T> clazz);重构成以下代码
@Override
public <T> Map<String, T> getCacheMap(String key, Class<T> clazz) {
Map<String, Object> raw = redisTemplate.opsForHash().entries(key);
Map<String, T> map = Maps.newLinkedHashMapWithExpectedSize(raw.size());
for (Map.Entry<String, Object> entry : raw.entrySet()) {
final String hashKey = entry.getKey();
final Object value = entry.getValue();
/***
* 假设redis中hash值类型存储的hashValue是不带转义字符的json，形如:
* <code>{"confirm":7,"dead":0,"heal":2,"weight":6.6,"mapId":"c320100_2","updateTime":"2020-03-03 07:20:39","name":"玄武区"}</code>
* spring redis template(jedis)会把他转换成LinkedHashMap，这个时候利用ModelMapper将其转换成目标实体类型，速度比带转义字符类型快38.798%
* */
if(value instanceof Map)
{
map.put(hashKey,modelMapper.map(value, clazz));
//处理带转义字符类型的json字符串
//"{\"id\":999,\"distId\":999,\"name\":\"玄武区\",\"confirm\":7,\"suspect\":0,\"dead\":0,\"heal\":2,\"weight\":6.6,\"level\":\"area\",\"mapId\":\"c320100_2\",\"updateTime\":\"2020-03-03 07:20:39\"}"
}else if(value instanceof String) {
map.put(hashKey, gson.fromJson((String)value, clazz));
}
}
return map;
}