Author: chetanm
Date: Tue Jan 5 07:44:44 2016
New Revision: 1723012
URL: http://svn.apache.org/viewvc?rev=1723012&view=rev
Log:
SLING-4080 - API to capture/measure application-level metrics
MetricService provides access to Metric instances. It also provides a NOOP
variant which can be used if dependency on MetricService is to be considered
optional.
Added:
sling/whiteboard/chetanm/metrics/src/main/java/org/apache/sling/metrics/MetricsService.java
(with props)
sling/whiteboard/chetanm/metrics/src/main/java/org/apache/sling/metrics/NoopMetric.java
(with props)
Added:
sling/whiteboard/chetanm/metrics/src/main/java/org/apache/sling/metrics/MetricsService.java
URL:
http://svn.apache.org/viewvc/sling/whiteboard/chetanm/metrics/src/main/java/org/apache/sling/metrics/MetricsService.java?rev=1723012&view=auto
==============================================================================
---
sling/whiteboard/chetanm/metrics/src/main/java/org/apache/sling/metrics/MetricsService.java
(added)
+++
sling/whiteboard/chetanm/metrics/src/main/java/org/apache/sling/metrics/MetricsService.java
Tue Jan 5 07:44:44 2016
@@ -0,0 +1,79 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.apache.sling.metrics;
+
+import aQute.bnd.annotation.ProviderType;
+
+@ProviderType
+public interface MetricsService {
+ MetricsService NOOP = new MetricsService() {
+ @Override
+ public Timer timer(String name) {
+ return NoopMetric.INSTANCE;
+ }
+
+ @Override
+ public Histogram histogram(String name) {
+ return NoopMetric.INSTANCE;
+ }
+
+ @Override
+ public Counter counter(String name) {
+ return NoopMetric.INSTANCE;
+ }
+
+ @Override
+ public Meter meter(String name) {
+ return NoopMetric.INSTANCE;
+ }
+ };
+
+ /**
+ * Creates a new {@link com.codahale.metrics.Timer} and registers it under
the given name.
+ *
+ * @param name the name of the metric
+ * @return a new {@link com.codahale.metrics.Timer}
+ */
+ Timer timer(String name);
+
+ /**
+ * Creates a new {@link com.codahale.metrics.Histogram} and registers it
under the given name.
+ *
+ * @param name the name of the metric
+ * @return a new {@link com.codahale.metrics.Histogram}
+ */
+ Histogram histogram(String name);
+
+ /**
+ * Creates a new {@link com.codahale.metrics.Counter} and registers it
under the given name.
+ *
+ * @param name the name of the metric
+ * @return a new {@link com.codahale.metrics.Counter}
+ */
+ Counter counter(String name);
+
+ /**
+ * Creates a new {@link com.codahale.metrics.Meter} and registers it under
the given name.
+ *
+ * @param name the name of the metric
+ * @return a new {@link com.codahale.metrics.Meter}
+ */
+ Meter meter(String name);
+}
Propchange:
sling/whiteboard/chetanm/metrics/src/main/java/org/apache/sling/metrics/MetricsService.java
------------------------------------------------------------------------------
svn:eol-style = native
Added:
sling/whiteboard/chetanm/metrics/src/main/java/org/apache/sling/metrics/NoopMetric.java
URL:
http://svn.apache.org/viewvc/sling/whiteboard/chetanm/metrics/src/main/java/org/apache/sling/metrics/NoopMetric.java?rev=1723012&view=auto
==============================================================================
---
sling/whiteboard/chetanm/metrics/src/main/java/org/apache/sling/metrics/NoopMetric.java
(added)
+++
sling/whiteboard/chetanm/metrics/src/main/java/org/apache/sling/metrics/NoopMetric.java
Tue Jan 5 07:44:44 2016
@@ -0,0 +1,94 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.apache.sling.metrics;
+
+import java.util.concurrent.TimeUnit;
+
+final class NoopMetric implements Counter, Histogram, Timer, Meter{
+ public static final NoopMetric INSTANCE = new NoopMetric();
+ @Override
+ public long getCount() {
+ return 0;
+ }
+
+ @Override
+ public void inc() {
+
+ }
+
+ @Override
+ public void dec() {
+
+ }
+
+ @Override
+ public void inc(long n) {
+
+ }
+
+ @Override
+ public void dec(long n) {
+
+ }
+
+ @Override
+ public void mark() {
+
+ }
+
+ @Override
+ public void mark(long n) {
+
+ }
+
+ @Override
+ public void update(long duration, TimeUnit unit) {
+
+ }
+
+ @Override
+ public Context time() {
+ return NoopContext.INSTANCE;
+ }
+
+ @Override
+ public void update(long value) {
+
+ }
+
+ @Override
+ public <AdapterType> AdapterType adaptTo(Class<AdapterType> type) {
+ return null;
+ }
+
+ private static final class NoopContext implements Context {
+ public static final NoopContext INSTANCE = new NoopContext();
+
+ @Override
+ public long stop() {
+ return 0;
+ }
+
+ @Override
+ public void close() {
+
+ }
+ }
+}
Propchange:
sling/whiteboard/chetanm/metrics/src/main/java/org/apache/sling/metrics/NoopMetric.java
------------------------------------------------------------------------------
svn:eol-style = native
