1 files changed, 155 insertions, 0 deletions
diff --git a/src/main/java/org/openecomp/sparky/analytics/HistoricalCounter.java b/src/main/java/org/openecomp/sparky/analytics/HistoricalCounter.java
new file mode 100644
index 0000000..f8c5f05
--- /dev/null
+++ b/src/main/java/org/openecomp/sparky/analytics/HistoricalCounter.java
@@ -0,0 +1,155 @@
+/**
+ * ============LICENSE_START===================================================
+ * SPARKY (AAI UI service)
+ * ============================================================================
+ * Copyright © 2017 AT&T Intellectual Property.
+ * Copyright © 2017 Amdocs
+ * All rights reserved.
+ * ============================================================================
+ * 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.
+ * ============LICENSE_END=====================================================
+ *
+ * ECOMP and OpenECOMP are trademarks
+ * and service marks of AT&T Intellectual Property.
+ */
+
+
+package org.openecomp.sparky.analytics;
+
+/**
+ * A simple class to model a historical counter. A set of values will be tracked and basic
+ * statistics will be calculated in real time (n, min, max, avg).
+ * 
+ * @author davea
+ */
+public class HistoricalCounter {
+
+  private double min;
+
+  private double max;
+
+  private double totalOfSamples;
+
+  private long numSamples;
+
+  private double value;
+
+  private boolean maintainSingleValue;
+
+  /**
+   * Instantiates a new historical counter.
+   *
+   * @param trackSingleValue the track single value
+   */
+  public HistoricalCounter(boolean trackSingleValue) {
+    min = -1;
+    max = 0;
+    totalOfSamples = 0;
+    value = 0.0;
+    numSamples = 0;
+    this.maintainSingleValue = trackSingleValue;
+  }
+
+  public boolean isSingleValue() {
+    return maintainSingleValue;
+  }
+
+  /**
+   * Update.
+   *
+   * @param value the value
+   */
+  public synchronized void update(double value) {
+
+    if (value < 0) {
+      return;
+    }
+
+    if (maintainSingleValue) {
+
+      this.value = value;
+
+    } else {
+
+      if (min == -1) {
+        min = value;
+      }
+
+      if (value < min) {
+        min = value;
+      }
+
+      if (value > max) {
+        max = value;
+      }
+
+      totalOfSamples += value;
+      numSamples++;
+    }
+  }
+
+  public double getValue() {
+    return value;
+  }
+
+  public double getMin() {
+    return min;
+  }
+
+  public double getMax() {
+    return max;
+  }
+
+  public long getNumSamples() {
+    return numSamples;
+  }
+
+  public double getAvg() {
+    if (numSamples == 0) {
+      return 0;
+    }
+
+    return (totalOfSamples / numSamples);
+  }
+
+  /**
+   * Reset.
+   */
+  public synchronized void reset() {
+    min = -1;
+    max = 0;
+    numSamples = 0;
+    totalOfSamples = 0;
+    value = 0.0;
+  }
+
+  /* (non-Javadoc)
+   * @see java.lang.Object#toString()
+   */
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder(32);
+
+    if (maintainSingleValue) {
+      sb.append("[ Val=").append(value).append(" ]");
+    } else {
+      sb.append("[ NumSamples=").append(numSamples).append(",");
+      sb.append(" Min=").append(min).append(",");
+      sb.append(" Max=").append(max).append(",");
+      sb.append(" Avg=").append(getAvg()).append(" ]");
+    }
+
+    return sb.toString();
+  }
+
+}