1 files changed, 73 insertions, 0 deletions
diff --git a/simplemetrics/src/main/java/com/yahoo/metrics/simple/Counter.java b/simplemetrics/src/main/java/com/yahoo/metrics/simple/Counter.java
new file mode 100644
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+++ b/simplemetrics/src/main/java/com/yahoo/metrics/simple/Counter.java
@@ -0,0 +1,73 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.metrics.simple;
+
+import com.google.common.annotations.Beta;
+import com.yahoo.metrics.simple.UntypedMetric.AssumedType;
+
+/**
+ * A counter metric. Create a counter by declaring it with
+ * {@link MetricReceiver#declareCounter(String)} or
+ * {@link MetricReceiver#declareCounter(String, Point)}.
+ *
+ * @author steinar
+ */
+@Beta
+public class Counter {
+    private final Point defaultPosition;
+    private final String name;
+    private final MetricReceiver metricReceiver;
+
+    Counter(String name, Point defaultPosition, MetricReceiver receiver) {
+        this.name = name;
+        this.defaultPosition = defaultPosition;
+        this.metricReceiver = receiver;
+    }
+
+    /**
+     * Increase the dimension-less/zero-point value of this counter by 1.
+     */
+    public void add() {
+        add(1L, defaultPosition);
+    }
+
+    /**
+     * Add to the dimension-less/zero-point value of this counter.
+     *
+     * @param n the amount by which to increase this counter
+     */
+    public void add(long n) {
+        add(n, defaultPosition);
+    }
+
+    /**
+     * Increase this metric at the given point by 1.
+     *
+     * @param p the point in the metric space at which to increase this metric by 1
+     */
+    public void add(Point p) {
+        add(1L, p);
+    }
+
+    /**
+     * Add to this metric at the given point.
+     *
+     * @param n
+     *            the amount by which to increase this counter
+     * @param p
+     *            the point in the metric space at which to add to the metric
+     */
+    public void add(long n, Point p) {
+        metricReceiver.update(new Sample(new Measurement(Long.valueOf(n)), new Identifier(name, p), AssumedType.COUNTER));
+    }
+
+    /**
+     * Create a PointBuilder with default dimension values as given when this
+     * counter was declared.
+     *
+     * @return a PointBuilder reflecting the default dimension values of this
+     *         counter
+     */
+    public PointBuilder builder() {
+        return new PointBuilder(defaultPosition);
+    }
+}