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From ju...@apache.org
Subject svn commit: r1180634 - in /jackrabbit/trunk/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/jmx: TimeSeriesMBean.java TimeSeriesRecorder.java
Date Sun, 09 Oct 2011 15:50:19 GMT
Author: jukka
Date: Sun Oct  9 15:50:19 2011
New Revision: 1180634

URL: http://svn.apache.org/viewvc?rev=1180634&view=rev
Log:
JCR-3040: JMX Stats for the Session

Add a mechanism for recording time series of various events

Added:
    jackrabbit/trunk/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/jmx/TimeSeriesMBean.java
  (with props)
    jackrabbit/trunk/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/jmx/TimeSeriesRecorder.java
  (with props)

Added: jackrabbit/trunk/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/jmx/TimeSeriesMBean.java
URL: http://svn.apache.org/viewvc/jackrabbit/trunk/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/jmx/TimeSeriesMBean.java?rev=1180634&view=auto
==============================================================================
--- jackrabbit/trunk/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/jmx/TimeSeriesMBean.java
(added)
+++ jackrabbit/trunk/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/jmx/TimeSeriesMBean.java
Sun Oct  9 15:50:19 2011
@@ -0,0 +1,57 @@
+/*
+ * 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.jackrabbit.core.jmx;
+
+/**
+ * Interface for a time series of the number of events per
+ * second, minute, hour and day. The type of the events is arbitrary; it
+ * could be cache hits or misses, disk reads or writes, created sessions,
+ * completed transactions, or pretty much anything of interest.
+ *
+ * @since Apache Jackrabbit 2.3.1
+ */
+public interface TimeSeriesMBean {
+
+    /**
+     * Returns the number of events per second over the last minute.
+     *
+     * @return number of events per second, in chronological order
+     */
+    long[] getEventsPerSecond();
+
+    /**
+     * Returns the number of events per minute over the last hour.
+     *
+     * @return number of events per minute, in chronological order
+     */
+    long[] getEventsPerMinute();
+
+    /**
+     * Returns the number of events per hour over the last week.
+     *
+     * @return number of events per hour, in chronological order
+     */
+    long[] getEventsPerHour();
+
+    /**
+     * Returns the number of events per week over the last three years.
+     *
+     * @return number of events per week, in chronological order
+     */
+    long[] getEventsPerWeek();
+
+}

Propchange: jackrabbit/trunk/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/jmx/TimeSeriesMBean.java
------------------------------------------------------------------------------
    svn:executable = *

Added: jackrabbit/trunk/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/jmx/TimeSeriesRecorder.java
URL: http://svn.apache.org/viewvc/jackrabbit/trunk/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/jmx/TimeSeriesRecorder.java?rev=1180634&view=auto
==============================================================================
--- jackrabbit/trunk/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/jmx/TimeSeriesRecorder.java
(added)
+++ jackrabbit/trunk/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/jmx/TimeSeriesRecorder.java
Sun Oct  9 15:50:19 2011
@@ -0,0 +1,129 @@
+/*
+ * 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.jackrabbit.core.jmx;
+
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicLong;
+
+/**
+ * Recorder of a time series. An instance of this class records (and clears)
+ * the state of a given {@link AtomicLong} counter once every second and
+ * exposes the collected time series through the {@link TimeSeriesMBean}
+ * interface.
+ */
+public class TimeSeriesRecorder implements TimeSeriesMBean {
+
+    /** Number of events per second over the last minute. */
+    private final long[] eventsPerSecond = new long[60];
+
+    /** Number of events per minute over the last hour. */
+    private final long[] eventsPerMinute = new long[60];
+
+    /** Number of events per hour over the last week. */
+    private final long[] eventsPerHour = new long[7 * 24];
+
+    /** Number of events per week over the last three years. */
+    private final long[] eventsPerWeek = new long[3 * 52];
+
+    /** Current second (index in {@link #eventsPerSecond}) */
+    private int seconds = 0;
+
+    /** Current minute (index in {@link #eventsPerMinute}) */
+    private int minutes = 0;
+
+    /** Current hour (index in {@link #eventsPerHour}) */
+    private int hours = 0;
+
+    /** Current week (index in {@link #eventsPerWeek}) */
+    private int weeks = 0;
+
+    public TimeSeriesRecorder(
+            final AtomicLong counter, ScheduledExecutorService executor) {
+        executor.scheduleAtFixedRate(new Runnable() {
+            public void run() {
+                eventsPerSecond[seconds++] = counter.getAndSet(0);
+                if (seconds == eventsPerSecond.length) {
+                    seconds = 0;
+                    eventsPerMinute[minutes++] = sum(eventsPerSecond);
+                }
+                if (minutes == eventsPerMinute.length) {
+                    minutes = 0;
+                    eventsPerHour[hours++] = sum(eventsPerMinute);
+                }
+                if (hours == eventsPerHour.length) {
+                    hours = 0;
+                    eventsPerWeek[weeks++] = sum(eventsPerHour);
+                }
+                if (weeks == eventsPerWeek.length) {
+                    weeks = 0;
+                }
+            }
+        }, 1, 1, TimeUnit.SECONDS);
+    }
+
+    //----------------------------------------------------------< TimeSeries >
+
+    public synchronized long[] getEventsPerSecond() {
+        return cyclicCopyFrom(eventsPerSecond, seconds);
+    }
+
+    public synchronized long[] getEventsPerMinute() {
+        return cyclicCopyFrom(eventsPerMinute, minutes);
+    }
+
+    public synchronized long[] getEventsPerHour() {
+        return cyclicCopyFrom(eventsPerHour, hours);
+    }
+
+    public synchronized long[] getEventsPerWeek() {
+        return cyclicCopyFrom(eventsPerWeek, weeks);
+    }
+
+    //-------------------------------------------------------------< private >
+
+    /**
+     * Returns the sum of all entries in the given array.
+     *
+     * @param array array to be summed
+     * @return sum of entries
+     */
+    private static long sum(long[] array) {
+        long sum = 0;
+        for (int i = 0; i < array.length; i++) {
+            sum += array[i];
+        }
+        return sum;
+    }
+
+    /**
+     * Returns a copy of the given cyclical array, with the element at
+     * the given position as the first element of the returned array.
+     *
+     * @param array cyclical array
+     * @param pos position of the first element
+     * @return copy of the array
+     */
+    private static long[] cyclicCopyFrom(long[] array, int pos) {
+        long[] reverse = new long[array.length];
+        for (int i = 0; i < array.length; i++) {
+            reverse[i] = array[(pos + i) % array.length];
+        }
+        return reverse;
+    }
+
+}

Propchange: jackrabbit/trunk/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/jmx/TimeSeriesRecorder.java
------------------------------------------------------------------------------
    svn:executable = *



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