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dubbo中MonitorFilter的作用是什么
这篇文章主要介绍“dubbo中MonitorFilter的作用是什么”，在日常操作中，相信很多人在dubbo中MonitorFilter的作用是什么问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”dubbo中MonitorFilter的作用是什么”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
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序
本文主要研究一下dubbo的MonitorFilter
MonitorFilter
dubbo-2.7.2/dubbo-monitor/dubbo-monitor-api/src/main/java/org/apache/dubbo/monitor/support/MonitorFilter.java
@Activate(group = {PROVIDER, CONSUMER})
public class MonitorFilter extends ListenableFilter {
private static final Logger logger = LoggerFactory.getLogger(MonitorFilter.class);
private static final String MONITOR_FILTER_START_TIME = "monitor_filter_start_time";
public MonitorFilter() {
super.listener = new MonitorListener();
}
/**
* The Concurrent counter
*/
private final ConcurrentMap concurrents = new ConcurrentHashMap();
/**
* The MonitorFactory
*/
private MonitorFactory monitorFactory;
public void setMonitorFactory(MonitorFactory monitorFactory) {
this.monitorFactory = monitorFactory;
}
/**
* The invocation interceptor,it will collect the invoke data about this invocation and send it to monitor center
*
* @param invoker service
* @param invocation invocation.
* @return {@link Result} the invoke result
* @throws RpcException
*/
@Override
public Result invoke(Invoker invoker, Invocation invocation) throws RpcException {
if (invoker.getUrl().hasParameter(MONITOR_KEY)) {
invocation.setAttachment(MONITOR_FILTER_START_TIME, String.valueOf(System.currentTimeMillis()));
getConcurrent(invoker, invocation).incrementAndGet(); // count up
}
return invoker.invoke(invocation); // proceed invocation chain
}
// concurrent counter
private AtomicInteger getConcurrent(Invoker invoker, Invocation invocation) {
String key = invoker.getInterface().getName() + "." + invocation.getMethodName();
AtomicInteger concurrent = concurrents.get(key);
if (concurrent == null) {
concurrents.putIfAbsent(key, new AtomicInteger());
concurrent = concurrents.get(key);
}
return concurrent;
}
//......
} MonitorFilter继承了ListenableFilter，其invoke方法在invoker的URL中包含有monitor参数时会给invocation设置monitor_filter_start_time的attachment，然后递增当前并发的次数；其创建的listener为MonitorListener
MonitorListener
dubbo-2.7.2/dubbo-monitor/dubbo-monitor-api/src/main/java/org/apache/dubbo/monitor/support/MonitorFilter.java
class MonitorListener implements Listener {
@Override
public void onResponse(Result result, Invoker invoker, Invocation invocation) {
if (invoker.getUrl().hasParameter(MONITOR_KEY)) {
collect(invoker, invocation, result, RpcContext.getContext().getRemoteHost(), Long.valueOf(invocation.getAttachment(MONITOR_FILTER_START_TIME)), false);
getConcurrent(invoker, invocation).decrementAndGet(); // count down
}
}
@Override
public void onError(Throwable t, Invoker invoker, Invocation invocation) {
if (invoker.getUrl().hasParameter(MONITOR_KEY)) {
collect(invoker, invocation, null, RpcContext.getContext().getRemoteHost(), Long.valueOf(invocation.getAttachment(MONITOR_FILTER_START_TIME)), true);
getConcurrent(invoker, invocation).decrementAndGet(); // count down
}
}
/**
* The collector logic, it will be handled by the default monitor
*
* @param invoker
* @param invocation
* @param result the invoke result
* @param remoteHost the remote host address
* @param start the timestamp the invoke begin
* @param error if there is an error on the invoke
*/
private void collect(Invoker invoker, Invocation invocation, Result result, String remoteHost, long start, boolean error) {
try {
URL monitorUrl = invoker.getUrl().getUrlParameter(MONITOR_KEY);
Monitor monitor = monitorFactory.getMonitor(monitorUrl);
if (monitor == null) {
return;
}
URL statisticsURL = createStatisticsUrl(invoker, invocation, result, remoteHost, start, error);
monitor.collect(statisticsURL);
} catch (Throwable t) {
logger.warn("Failed to monitor count service " + invoker.getUrl() + ", cause: " + t.getMessage(), t);
}
}
/**
* Create statistics url
*
* @param invoker
* @param invocation
* @param result
* @param remoteHost
* @param start
* @param error
* @return
*/
private URL createStatisticsUrl(Invoker invoker, Invocation invocation, Result result, String remoteHost, long start, boolean error) {
// ---- service statistics ----
long elapsed = System.currentTimeMillis() - start; // invocation cost
int concurrent = getConcurrent(invoker, invocation).get(); // current concurrent count
String application = invoker.getUrl().getParameter(APPLICATION_KEY);
String service = invoker.getInterface().getName(); // service name
String method = RpcUtils.getMethodName(invocation); // method name
String group = invoker.getUrl().getParameter(GROUP_KEY);
String version = invoker.getUrl().getParameter(VERSION_KEY);
int localPort;
String remoteKey, remoteValue;
if (CONSUMER_SIDE.equals(invoker.getUrl().getParameter(SIDE_KEY))) {
// ---- for service consumer ----
localPort = 0;
remoteKey = MonitorService.PROVIDER;
remoteValue = invoker.getUrl().getAddress();
} else {
// ---- for service provider ----
localPort = invoker.getUrl().getPort();
remoteKey = MonitorService.CONSUMER;
remoteValue = remoteHost;
}
String input = "", output = "";
if (invocation.getAttachment(INPUT_KEY) != null) {
input = invocation.getAttachment(INPUT_KEY);
}
if (result != null && result.getAttachment(OUTPUT_KEY) != null) {
output = result.getAttachment(OUTPUT_KEY);
}
return new URL(COUNT_PROTOCOL, NetUtils.getLocalHost(), localPort, service + PATH_SEPARATOR + method, MonitorService.APPLICATION, application, MonitorService.INTERFACE, service, MonitorService.METHOD, method, remoteKey, remoteValue, error ? MonitorService.FAILURE : MonitorService.SUCCESS, "1", MonitorService.ELAPSED, String.valueOf(elapsed), MonitorService.CONCURRENT, String.valueOf(concurrent), INPUT_KEY, input, OUTPUT_KEY, output, GROUP_KEY, group, VERSION_KEY, version);
}
}MonitorListener实现了Listener接口，其onResponse及onError方法在invoker的URL中包含有monitor参数时会上报指标，然后递减并发次数
实例
dubbo-2.7.2/dubbo-monitor/dubbo-monitor-api/src/test/java/org/apache/dubbo/monitor/support/MonitorFilterTest.java
public class MonitorFilterTest {
private volatile URL lastStatistics;
private volatile Invocation lastInvocation;
private final Invoker serviceInvoker = new Invoker() {
@Override
public Class getInterface() {
return MonitorService.class;
}
public URL getUrl() {
try {
return URL.valueOf("dubbo://" + NetUtils.getLocalHost() + ":20880?" + APPLICATION_KEY + "=abc&" + SIDE_KEY + "=" + CONSUMER_SIDE + "&" + MONITOR_KEY + "=" + URLEncoder.encode("dubbo://" + NetUtils.getLocalHost() + ":7070", "UTF-8"));
} catch (UnsupportedEncodingException e) {
throw new IllegalStateException(e.getMessage(), e);
}
}
@Override
public boolean isAvailable() {
return false;
}
public Result invoke(Invocation invocation) throws RpcException {
lastInvocation = invocation;
return AsyncRpcResult.newDefaultAsyncResult(invocation);
}
@Override
public void destroy() {
}
};
private MonitorFactory monitorFactory = new MonitorFactory() {
@Override
public Monitor getMonitor(final URL url) {
return new Monitor() {
public URL getUrl() {
return url;
}
@Override
public boolean isAvailable() {
return true;
}
@Override
public void destroy() {
}
public void collect(URL statistics) {
MonitorFilterTest.this.lastStatistics = statistics;
}
public List lookup(URL query) {
return Arrays.asList(MonitorFilterTest.this.lastStatistics);
}
};
}
};
@Test
public void testFilter() throws Exception {
MonitorFilter monitorFilter = new MonitorFilter();
monitorFilter.setMonitorFactory(monitorFactory);
Invocation invocation = new RpcInvocation("aaa", new Class[0], new Object[0]);
RpcContext.getContext().setRemoteAddress(NetUtils.getLocalHost(), 20880).setLocalAddress(NetUtils.getLocalHost(), 2345);
Result result = monitorFilter.invoke(serviceInvoker, invocation);
result.thenApplyWithContext((r) -> {
monitorFilter.listener().onResponse(r, serviceInvoker, invocation);
return r;
});
while (lastStatistics == null) {
Thread.sleep(10);
}
Assertions.assertEquals("abc", lastStatistics.getParameter(MonitorService.APPLICATION));
Assertions.assertEquals(MonitorService.class.getName(), lastStatistics.getParameter(MonitorService.INTERFACE));
Assertions.assertEquals("aaa", lastStatistics.getParameter(MonitorService.METHOD));
Assertions.assertEquals(NetUtils.getLocalHost() + ":20880", lastStatistics.getParameter(MonitorService.PROVIDER));
Assertions.assertEquals(NetUtils.getLocalHost(), lastStatistics.getAddress());
Assertions.assertEquals(null, lastStatistics.getParameter(MonitorService.CONSUMER));
Assertions.assertEquals(1, lastStatistics.getParameter(MonitorService.SUCCESS, 0));
Assertions.assertEquals(0, lastStatistics.getParameter(MonitorService.FAILURE, 0));
Assertions.assertEquals(1, lastStatistics.getParameter(MonitorService.CONCURRENT, 0));
Assertions.assertEquals(invocation, lastInvocation);
}
@Test
public void testSkipMonitorIfNotHasKey() {
MonitorFilter monitorFilter = new MonitorFilter();
MonitorFactory mockMonitorFactory = mock(MonitorFactory.class);
monitorFilter.setMonitorFactory(mockMonitorFactory);
Invocation invocation = new RpcInvocation("aaa", new Class[0], new Object[0]);
Invoker invoker = mock(Invoker.class);
given(invoker.getUrl()).willReturn(URL.valueOf("dubbo://" + NetUtils.getLocalHost() + ":20880?" + APPLICATION_KEY + "=abc&" + SIDE_KEY + "=" + CONSUMER_SIDE));
monitorFilter.invoke(invoker, invocation);
verify(mockMonitorFactory, never()).getMonitor(any(URL.class));
}
@Test
public void testGenericFilter() throws Exception {
MonitorFilter monitorFilter = new MonitorFilter();
monitorFilter.setMonitorFactory(monitorFactory);
Invocation invocation = new RpcInvocation("$invoke", new Class[]{String.class, String[].class, Object[].class}, new Object[]{"xxx", new String[]{}, new Object[]{}});
RpcContext.getContext().setRemoteAddress(NetUtils.getLocalHost(), 20880).setLocalAddress(NetUtils.getLocalHost(), 2345);
Result result = monitorFilter.invoke(serviceInvoker, invocation);
result.thenApplyWithContext((r) -> {
monitorFilter.listener().onResponse(r, serviceInvoker, invocation);
return r;
});
while (lastStatistics == null) {
Thread.sleep(10);
}
Assertions.assertEquals("abc", lastStatistics.getParameter(MonitorService.APPLICATION));
Assertions.assertEquals(MonitorService.class.getName(), lastStatistics.getParameter(MonitorService.INTERFACE));
Assertions.assertEquals("xxx", lastStatistics.getParameter(MonitorService.METHOD));
Assertions.assertEquals(NetUtils.getLocalHost() + ":20880", lastStatistics.getParameter(MonitorService.PROVIDER));
Assertions.assertEquals(NetUtils.getLocalHost(), lastStatistics.getAddress());
Assertions.assertEquals(null, lastStatistics.getParameter(MonitorService.CONSUMER));
Assertions.assertEquals(1, lastStatistics.getParameter(MonitorService.SUCCESS, 0));
Assertions.assertEquals(0, lastStatistics.getParameter(MonitorService.FAILURE, 0));
Assertions.assertEquals(1, lastStatistics.getParameter(MonitorService.CONCURRENT, 0));
Assertions.assertEquals(invocation, lastInvocation);
}
@Test
public void testSafeFailForMonitorCollectFail() {
MonitorFilter monitorFilter = new MonitorFilter();
MonitorFactory mockMonitorFactory = mock(MonitorFactory.class);
Monitor mockMonitor = mock(Monitor.class);
Mockito.doThrow(new RuntimeException()).when(mockMonitor).collect(any(URL.class));
monitorFilter.setMonitorFactory(mockMonitorFactory);
given(mockMonitorFactory.getMonitor(any(URL.class))).willReturn(mockMonitor);
Invocation invocation = new RpcInvocation("aaa", new Class[0], new Object[0]);
monitorFilter.invoke(serviceInvoker, invocation);
}
} MonitorFilterTest验证了testFilter、testSkipMonitorIfNotHasKey、testGenericFilter、testSafeFailForMonitorCollectFail这几个场景
小结
MonitorFilter继承了ListenableFilter，其invoke方法在invoker的URL中包含有monitor参数时会给invocation设置monitor_filter_start_time的attachment，然后递增当前并发的次数；其创建的listener为MonitorListener；MonitorListener实现了Listener接口，其onResponse及onError方法在invoker的URL中包含有monitor参数时会上报指标，然后递减并发次数
到此，关于“dubbo中MonitorFilter的作用是什么”的学习就结束了，希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习，快去试试吧！若想继续学习更多相关知识，请继续关注创新互联网站，小编会继续努力为大家带来更多实用的文章！
文章名称：dubbo中MonitorFilter的作用是什么
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