聊聊dubbo的TimeoutFilter
序
本文主要研究一下dubbo的TimeoutFilter
ListenableFilter
dubbo-2.7.2/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/ListenableFilter.java
public abstract class ListenableFilter implements Filter {
protected Listener listener = null;
public Listener listener() {
return listener;
}
}
ListenableFilter宣告实现Filter界面，它主要定义了listener()方法TimeoutFilter
dubbo-2.7.2/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/filter/TimeoutFilter.java
@Activate(group = CommonConstants.PROVIDER)
public class TimeoutFilter extends ListenableFilter {
private static final Logger logger = LoggerFactory.getLogger(TimeoutFilter.class);
private static final String TIMEOUT_FILTER_START_TIME = "timeout_filter_start_time";
public TimeoutFilter() {
super.listener = new TimeoutListener();
}
@Override
public Result invoke(Invoker> invoker, Invocation invocation) throws RpcException {
invocation.setAttachment(TIMEOUT_FILTER_START_TIME, String.valueOf(System.currentTimeMillis()));
return invoker.invoke(invocation);
}
static class TimeoutListener implements Listener {
@Override
public void onResponse(Result appResponse, Invoker> invoker, Invocation invocation) {
String startAttach = invocation.getAttachment(TIMEOUT_FILTER_START_TIME);
if (startAttach != null) {
long elapsed = System.currentTimeMillis() - Long.valueOf(startAttach);
if (invoker.getUrl() != null && elapsed > invoker.getUrl().getMethodParameter(invocation.getMethodName(), "timeout", Integer.MAX_VALUE)) {
if (logger.isWarnEnabled()) {
logger.warn("invoke time out. method: " + invocation.getMethodName() + " arguments: " + Arrays.toString(invocation.getArguments()) + " , url is " + invoker.getUrl() + ", invoke elapsed " + elapsed + " ms.");
}
}
}
}
@Override
public void onError(Throwable t, Invoker> invoker, Invocation invocation) {
}
}
}
TimeoutFilter继承了ListenableFilter，其构造器初始化的listener为TimeoutListener；invoke方法先记录开始执行的时间，之后执行结束时会回拨Listener的onResponse或onError方法；TimeoutListener的onResponse会取出timeout_filter_start_time值，如果存在则计算执行耗时，在设定了有效timeout且耗时大于该timeout时，会打印warn日志小结
TimeoutFilter继承了ListenableFilter，其构造器初始化的listener为TimeoutListener；invoke方法先记录开始执行的时间，之后执行结束时会回拨Listener的onResponse或onError方法；TimeoutListener的onResponse会取出timeout_filter_start_time值，如果存在则计算执行耗时，在设定了有效timeout且耗时大于该timeout时，会打印warn日志
doc
TimeoutFilter
