Dubbo supports server-side and client-side result caching.
Currently, versions 3.0 and above of Dubbo support the following built-in caching strategies:
lru removes excess cache based on the least recently used principle, keeping the hottest data cached.lfu implements cache strategy based on the principle of evicting the least frequently used.expiring implements cache strategy based on expiration time.threadlocal caches in the current thread, for example in a page render when many portals are needed to query user information, using thread cache can reduce such unnecessary accesses.jcache integrates with JSR107, bridging various cache implementations.Cache types are extensible Cache Extension
About Example Code
Result caching is used to accelerate access speed to hot data. Dubbo provides declarative caching to reduce users’ workload in adding caching.
In Dubbo, RPC call result caching supports configuration control at both the interface and method granularity.
Interface Granularity
XML Configuration:
<dubbo:reference interface="com.foo.DemoService" cache="lru" />
Annotation Configuration:
@DubboReference(cache = "lru")
private DemoService demoService;
Method Granularity
<dubbo:reference interface="com.foo.DemoService">
<dubbo:method name="sayHello" cache="lru" />
</dubbo:reference>
Annotation Configuration:
@DubboReference(methods = {@Method(name="sayHello",cache = "lru")})
private DemoService demoService;
Interface Granularity
XML Configuration:
<bean id="demoService" class="org.apache.dubbo.demo.provider.DemoServiceImpl"/>
<dubbo:service interface="com.foo.DemoService" ref="demoService" cache="lru" />
Annotation Configuration:
@DubboService(cache = "lru")
public class DemoServiceImpl implements DemoService {
private static final Logger logger = LoggerFactory.getLogger(DemoServiceImpl.class);
@Override
public String sayHello(String name) {
logger.info("Hello " + name + ", request from consumer: " + RpcContext.getContext().getRemoteAddress());
return "Hello " + name;
}
}
Method Granularity
<bean id="demoService" class="org.apache.dubbo.demo.provider.DemoServiceImpl"/>
<dubbo:service interface="com.foo.DemoService" ref="demoService" cache="lru" />
<dubbo:method name="sayHello" cache="lru" />
</dubbo:service>
Annotation Configuration:
@DubboService(methods = {@Method(name="sayHello",cache = "lru")})
public class DemoServiceImpl implements DemoService {
private static final Logger logger = LoggerFactory.getLogger(DemoServiceImpl.class);
@Override
public String sayHello(String name) {
logger.info("Hello " + name + ", request from consumer: " + RpcContext.getContext().getRemoteAddress());
return "Hello " + name;
}
}