[HWKMETRICS-719] Log REST API requests execution time.

api/metrics-api-jaxrs/pom.xml

@@ -123,6 +123,12 @@
       <version>${version.org.infinispan.wildfly}</version>
     </dependency>
 
+    <dependency>
+      <groupId>io.undertow</groupId>
+      <artifactId>undertow-servlet</artifactId>
+      <scope>provided</scope>
+    </dependency>
+
     <!-- documentation -->
     <dependency>
       <groupId>io.swagger</groupId>

api/metrics-api-jaxrs/src/main/java/org/hawkular/metrics/api/jaxrs/log/time/RequestTimeLogger.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright 2014-2017 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.hawkular.metrics.api.jaxrs.log.time;
+
+import org.hawkular.metrics.api.jaxrs.log.RestLogger;
+import org.hawkular.metrics.api.jaxrs.log.RestLogging;
+
+import io.undertow.server.ExchangeCompletionListener;
+import io.undertow.server.HttpHandler;
+import io.undertow.server.HttpServerExchange;
+
+public class RequestTimeLogger implements HttpHandler {
+
+    private static final RestLogger log = RestLogging.getRestLogger(RequestTimeLogger.class);
+
+    private HttpHandler next;
+
+    private long timeThreshold;
+
+    public RequestTimeLogger(HttpHandler next, long timeThreshold) {
+        this.next = next;
+        this.timeThreshold = timeThreshold;
+    }
+
+    @Override
+    public void handleRequest(HttpServerExchange exchange) throws Exception {
+
+        TimeMeasurer timeMeasurer = new TimeMeasurer(this.timeThreshold);
+        timeMeasurer.setStartTime(System.currentTimeMillis());
+        exchange.addExchangeCompleteListener(timeMeasurer);
+        next.handleRequest(exchange);
+    }
+
+    private class TimeMeasurer implements ExchangeCompletionListener {
+
+        private long start;
+
+        private long timeThreshold;
+
+        TimeMeasurer(long timeThreshold){
+            this.timeThreshold = timeThreshold;
+        }
+
+        @Override
+        public void exchangeEvent(HttpServerExchange exchange, NextListener nextListener) {
+            try {
+                long end = System.currentTimeMillis();
+                long duration = end - start;
+                if (duration > this.timeThreshold) {
+                    String method = exchange.getRequestMethod().toString();
+                    String uri = exchange.getRequestURI();
+                    String query = exchange.getQueryString();
+                    log.warn("Request " + method + " " + uri + (query.isEmpty() ? "":("?" + query)) + " took: "+
+                            duration + " ms, exceeds " +  this.timeThreshold +" ms threshold");
+                }
+            } finally {
+                if (nextListener != null) {
+                    nextListener.proceed();
+                }
+            }
+        }
+
+        void setStartTime(long start) {
+            this.start = start;
+        }
+    }
+
+
+}

api/metrics-api-jaxrs/src/main/java/org/hawkular/metrics/api/jaxrs/log/time/TimerLoggerServletExtension.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2014-2017 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.hawkular.metrics.api.jaxrs.log.time;
+
+import java.io.InputStream;
+import java.util.Properties;
+
+import javax.servlet.ServletContext;
+
+import io.undertow.servlet.ServletExtension;
+import io.undertow.servlet.api.DeploymentInfo;
+
+
+public class TimerLoggerServletExtension implements ServletExtension {
+
+    private RequestTimeLogger requestTimeLogger;
+
+    private static final String PROPERTY_FILE = "/WEB-INF/time-logger-filter.properties";
+
+
+    @Override
+    public void handleDeployment(DeploymentInfo deploymentInfo, ServletContext servletContext) {
+
+        long timeThreshold = 0;
+
+        InputStream is = servletContext.getResourceAsStream(PROPERTY_FILE);
+
+        if (is != null) {
+            try {
+                String timeThresholdString;
+                Properties props = new Properties();
+                props.load(is);
+                timeThresholdString = props.getProperty("logging-time-threshold");
+                if (timeThresholdString != null && !timeThresholdString.isEmpty()) {
+                    timeThreshold = Long.parseLong(timeThresholdString);
+                }
+            } catch (Exception e) {
+                throw new RuntimeException(e);
+            }
+        }
+
+        final long cTimeThreshold = timeThreshold;
+
+        if (timeThreshold > 0) {
+            deploymentInfo.addInitialHandlerChainWrapper(containerHandler -> {
+                requestTimeLogger = new RequestTimeLogger(containerHandler, cTimeThreshold);
+                return requestTimeLogger;
+            });
+        }
+    }
+}

api/metrics-api-jaxrs/src/main/resources/META-INF/services/io.undertow.servlet.ServletExtension

@@ -0,0 +1,18 @@
+#
+# Copyright 2014-2017 Red Hat, Inc. and/or its affiliates
+# and other contributors as indicated by the @author tags.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+org.hawkular.metrics.api.jaxrs.log.time.TimerLoggerServletExtension

api/metrics-api-jaxrs/src/main/webapp/WEB-INF/time-logger-filter.properties

@@ -0,0 +1,18 @@
+#
+# Copyright 2014-2017 Red Hat, Inc. and/or its affiliates
+# and other contributors as indicated by the @author tags.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+logging-time-threshold = 5