1 files changed, 0 insertions, 141 deletions
diff --git a/metrics/src/main/java/com/yahoo/metrics/util/MetricValueSet.java b/metrics/src/main/java/com/yahoo/metrics/util/MetricValueSet.java
deleted file mode 100644
index 0ba3138f3d7..00000000000
--- a/metrics/src/main/java/com/yahoo/metrics/util/MetricValueSet.java
+++ /dev/null
@@ -1,141 +0,0 @@
-// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
-/**
- * \class MetricValueSet
- * \ingroup metrics
- *
- * \brief Utility for doing lockless metric updates and reads.
- *
- * We don't want to use regular locking while updating metrics due to overhead.
- * We use this class to make metric updates as safe as possible without
- * requiring locks.
- *
- * It keeps the set of values a metric wants to set. Thus it is templated on
- * the class keeping the values. All that is required of this class is that it
- * has an empty constructor and a copy constructor.
- *
- * The locking works, by keeping a set of values, with an active pointer into
- * the value vector. Assuming only one thread calls setValues(), it can update
- * the active pointer safely. We assume updating the active pointer is a
- * non-interruptable operations, such that other threads will see either the new
- * or the old value correctly. This should be the case on our platforms.
- *
- * Due to the reset functionality, it is possible to miss out on a metrics
- * added during the reset, but this is very unlikely. For that to happen, when
- * someone sets the reset flag, the writer thread must be in setValues(),
- * having already passed the check for the reset flag, but not finished setting
- * the values yet.
- */
-
-package com.yahoo.metrics.util;
-
-import java.util.Collection;
-import com.yahoo.metrics.JoinBehavior;
-
-public class MetricValueSet<Value extends HasCopy<Value> & ValueType>
-    implements MetricValueKeeper<Value>
-{
-    private final ValueType[] values;
-
-    private void setIndexedValue(int idx, Value v) {
-        values[idx] = v;
-    }
-
-    @SuppressWarnings("unchecked")
-    private Value getIndexedValue(int idx) {
-        return (Value) values[idx];
-    }
-
-
-    private volatile int activeValueIndex;
-    private volatile boolean reset = false;
-
-    public MetricValueSet() {
-        values = new ValueType[3];
-        activeValueIndex = 0;
-    }
-
-    public MetricValueSet(MetricValueSet<Value> other, int copyCount) {
-        values = new ValueType[copyCount];
-        activeValueIndex = 0;
-        setValue(other.getValue());
-    }
-
-    /** Get the current values. */
-    public Value getValue() {
-        if (reset) return null;
-        Value v = getIndexedValue(activeValueIndex);
-        return (v == null ? null : v.copyObject());
-    }
-
-    /**
-     * Get the current values from the metric. This function should not be
-     * called in parallel. Only call it from a single thread or use external
-     * locking. If it returns false, it means the metric have just been reset.
-     * In which case, redo getValues(), apply the update again, and call
-     * setValues() again.
-     */
-    public boolean setValue(Value value) {
-        int nextIndex = (activeValueIndex + 1) % values.length;
-        if (reset) {
-            reset = false;
-            setIndexedValue(nextIndex, null);
-            activeValueIndex = nextIndex;
-            return false;
-        } else {
-            setIndexedValue(nextIndex, value);
-            activeValueIndex = nextIndex;
-            return true;
-        }
-    }
-
-    /**
-     * Retrieve and reset in a single operation, to minimize chance of
-     * alteration in the process.
-     */
-    public Value getValuesAndReset() {
-        Value result = getValue();
-        reset = true;
-        return result;
-    }
-
-    public String toString() {
-        String retVal = "MetricValueSet(reset=" + reset
-                      + ", active " + activeValueIndex + "[";
-        for (ValueType n : values) retVal += n + ",";
-        retVal += "])";
-        return retVal;
-    }
-
-    public int size() { return values.length; }
-
-    public void add(Value v) {
-        while (true) {
-            Value current = getValue();
-            if (current != null) {
-                current.add(v);
-                if (setValue(current)) {
-                    return;
-                }
-            } else {
-                if (setValue(v)) {
-                    return;
-                }
-            }
-        }
-    }
-
-    public void set(Value v) {
-        setValue(v);
-    }
-
-    public Value get(JoinBehavior joinBehavior) {
-        return getValue();
-    }
-
-    public void reset() { reset = true; }
-
-    public Collection<Value> getDirectoryView() {
-        return null;
-    }
-
-}