Add Tags support, add Metric.ID

metrics-ebean/src/main/java/io/avaje/metrics/ebean/DatabaseMetricSupplier.java

@@ -36,13 +36,13 @@ public List<Metric.Statistics> collectMetrics() {
       log.log(Level.DEBUG, dbMetrics.asJson().withHash(false).withNewLine(false).json());
     }
     for (MetaTimedMetric timedMetric : dbMetrics.timedMetrics()) {
-      metrics.add(new TimerStats(timedMetric.name(), timedMetric.count(), timedMetric.total(), timedMetric.max()));
+      metrics.add(new TimerStats(Metric.ID.of(timedMetric.name()), timedMetric.count(), timedMetric.total(), timedMetric.max()));
     }
     for (MetaQueryMetric metric : dbMetrics.queryMetrics()) {
-      metrics.add(new TimerStats(metric.name(), metric.count(), metric.total(), metric.max()));
+      metrics.add(new TimerStats(Metric.ID.of(metric.name()), metric.count(), metric.total(), metric.max()));
     }
     for (MetaCountMetric metric : dbMetrics.countMetrics()) {
-      metrics.add(new CounterStats(metric.name(), metric.count()));
+      metrics.add(new CounterStats(Metric.ID.of(metric.name()), metric.count()));
     }
     return metrics;
   }

metrics/src/main/java/io/avaje/metrics/MId.java

@@ -0,0 +1,65 @@
+package io.avaje.metrics;
+
+import java.util.Objects;
+
+import static java.util.Objects.requireNonNull;
+
+final class MId implements Metric.ID {
+
+  private final String name;
+  private final Tags tags;
+
+  MId(String name, Tags tags) {
+    this.name = name;
+    this.tags = tags;
+  }
+
+  @Override
+  public String name() {
+    return name;
+  }
+
+  @Override
+  public Tags tags() {
+    return tags;
+  }
+
+  @Override
+  public Metric.ID suffix(String suffix) {
+    return new MId(name + requireNonNull(suffix), tags);
+  }
+
+  @Override
+  public Metric.ID withName(String otherName) {
+    if (name.equals(requireNonNull(otherName))) {
+      return this;
+    }
+    return new MId(otherName, tags);
+  }
+
+  @Override
+  public Metric.ID withTags(Tags otherTags) {
+    if (tags.equals(requireNonNull(otherTags))) {
+      return this;
+    }
+    return new MId(name, otherTags);
+  }
+
+  @Override
+  public boolean equals(Object object) {
+    if (this == object) return true;
+    if (!(object instanceof MId)) return false;
+    MId key = (MId) object;
+    return Objects.equals(name, key.name) && Objects.equals(tags, key.tags);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(name, tags);
+  }
+
+  @Override
+  public String toString() {
+    return tags.isEmpty() ? name : name + ' ' + tags;
+  }
+}

metrics/src/main/java/io/avaje/metrics/MTags.java

@@ -0,0 +1,46 @@
+package io.avaje.metrics;
+
+import java.util.Arrays;
+import java.util.Objects;
+
+final class MTags implements Tags {
+
+  static Tags EMPTY = new MTags(new String[]{});
+
+  private final String[] keyValuePairs;
+
+  MTags(String[] keyValuePairs) {
+    if (keyValuePairs.length % 2 != 0) {
+      throw new IllegalArgumentException("Incorrect length, must be pairs of key values");
+    }
+    this.keyValuePairs = keyValuePairs;
+  }
+
+  @Override
+  public boolean isEmpty() {
+    return keyValuePairs.length == 0;
+  }
+
+  @Override
+  public String[] array() {
+    return keyValuePairs;
+  }
+
+  @Override
+  public boolean equals(Object object) {
+    if (this == object) return true;
+    if (!(object instanceof MTags)) return false;
+    MTags dTags = (MTags) object;
+    return Objects.deepEquals(keyValuePairs, dTags.keyValuePairs);
+  }
+
+  @Override
+  public int hashCode() {
+    return Arrays.hashCode(keyValuePairs);
+  }
+
+  @Override
+  public String toString() {
+    return keyValuePairs.length == 0 ? "" : "tags:" + Arrays.toString(keyValuePairs);
+  }
+}

metrics/src/main/java/io/avaje/metrics/Metric.java

@@ -14,6 +14,11 @@
  */
 public interface Metric {
 
+  /**
+   * Return the Id of the metric.
+   */
+  ID id();
+
   /**
    * Return the name of the metric.
    */
@@ -28,19 +33,69 @@ public interface Metric {
   /**
    * Reset the statistics resetting any internal counters etc.
    * <p>
-   * Typically the MetricManager takes care of resetting the statistic/counters for the metrics when
-   * it periodically collects and reports all the metrics and you are not expected to use this method.
-   * </p>
+   * Typically, the MetricRegistry takes care of resetting the statistic/counters for the metrics when
+   * it periodically collects and reports all the metrics, and you are not expected to use this method.
    */
   void reset();
 
+  /**
+   * Identifier of a Metric based on both the name and tags.
+   */
+  interface ID {
+
+    /**
+     * Create an Id given a name only.
+     */
+    static ID of(String name) {
+      return new MId(name, Tags.EMPTY);
+    }
+
+    /**
+     * Create an Id given name and tags.
+     */
+    static ID of(String name, Tags tags) {
+      return new MId(name, tags);
+    }
+
+    /**
+     * Return the metric name.
+     */
+    String name();
+
+    /**
+     * Return the tags.
+     */
+    Tags tags();
+
+    /**
+     * Return an Id appending the suffix to the name.
+     */
+    ID suffix(String suffix);
+
+    /**
+     * Return an Id with the given name..
+     */
+    ID withName(String otherName);
+
+    /**
+     * Return an Id with the given name..
+     */
+    ID withTags(Tags tags);
+
+  }
+
   /**
    * Common for statistics of all metrics.
    */
   interface Statistics {
 
     /**
-     * Return the associated metric name.
+     * Return the metric id.
+     */
+    ID id();
+
+    /**
+     * Return the metric name.
      */
     String name();
 

metrics/src/main/java/io/avaje/metrics/MetricRegistry.java

@@ -15,26 +15,51 @@ public interface MetricRegistry extends JvmMetrics {
    */
   Counter counter(String name);
 
+  /**
+   * Return the Counter with the given name and tags.
+   */
+  Counter counter(String name, Tags tags);
+
   /**
    * Return the Meter using the metric name.
    */
   Meter meter(String name);
 
+  /**
+   * Return the Meter using the metric name and tags.
+   */
+  Meter meter(String name, Tags tags);
+
   /**
    * Create and register a gauge using the supplied double values.
    */
   GaugeDouble gauge(String name, DoubleSupplier supplier);
 
+  /**
+   * Create and register a gauge using the supplied double values.
+   */
+  GaugeDouble gauge(String name, Tags tags, DoubleSupplier supplier);
+
   /**
    * Create and register a gauge using the supplied long values.
    */
   GaugeLong gauge(String name, LongSupplier supplier);
 
+  /**
+   * Create and register a gauge using the supplied long values.
+   */
+  GaugeLong gauge(String name, Tags tags, LongSupplier supplier);
+
   /**
    * Return the timer using the metric name.
    */
   Timer timer(String name);
 
+  /**
+   * Return the timer using the metric name and tags.
+   */
+  Timer timer(String name, Tags tags);
+
   /**
    * Return the bucket timer using the given base metric name and bucketRanges.
    *
@@ -43,6 +68,15 @@ public interface MetricRegistry extends JvmMetrics {
    */
   Timer timer(String name, int... bucketRanges);
 
+  /**
+   * Return the bucket timer using the given base metric name, tags and bucketRanges.
+   *
+   * @param name         The metric name
+   * @param tags         The metric tags
+   * @param bucketRanges Time in milliseconds which are used to create buckets.
+   */
+  Timer timer(String name, Tags tags, int... bucketRanges);
+
   /**
    * Return the TimerGroup using the given base metric name.
    */

metrics/src/main/java/io/avaje/metrics/Tags.java

@@ -0,0 +1,18 @@
+package io.avaje.metrics;
+
+public interface Tags {
+
+  Tags EMPTY = MTags.EMPTY;
+
+  static Tags of() {
+    return EMPTY;
+  }
+
+  static Tags of(String... keyValuePairs) {
+    return new MTags(keyValuePairs);
+  }
+
+  String[] array();
+
+  boolean isEmpty();
+}

metrics/src/main/java/io/avaje/metrics/core/BaseReportName.java

@@ -5,16 +5,21 @@
 
 abstract class BaseReportName {
 
-  final String name;
-  @Nullable String reportName;
+  final Metric.ID id;
+  volatile Metric.@Nullable ID reportId;
 
-  BaseReportName(String name) {
-    this.name = name;
+  BaseReportName(Metric.ID id) {
+    this.id = id;
   }
 
-  final String reportName(Metric.Visitor collector) {
-    final String tmp = collector.namingConvention().apply(name);
-    this.reportName = tmp;
+  final Metric.ID reportId(Metric.Visitor collector) {
+    final var id = reportId;
+    return id != null ? id : useNamingConvention(collector);
+  }
+
+  final Metric.ID useNamingConvention(Metric.Visitor collector) {
+    final Metric.ID tmp = id.withName(collector.namingConvention().apply(id.name()));
+    this.reportId = tmp;
     return tmp;
   }
 

metrics/src/main/java/io/avaje/metrics/core/BucketTimerFactory.java

@@ -1,27 +1,28 @@
 package io.avaje.metrics.core;
 
+import io.avaje.metrics.Metric;
 import io.avaje.metrics.Timer;
 import io.avaje.metrics.spi.SpiMetricBuilder;
 
 final class BucketTimerFactory implements SpiMetricBuilder.Factory<Timer> {
 
   @Override
-  public Timer createMetric(String name, int[] bucketRanges) {
+  public Timer createMetric(Metric.ID id, int[] bucketRanges) {
     int rangeBottom = 0;
     Timer[] buckets = new Timer[bucketRanges.length + 1];
     for (int i = 0; i < bucketRanges.length; i++) {
       int rangeTop = bucketRanges[i];
-      buckets[i] = createTimedMetric(name, rangeBottom, rangeTop);
+      buckets[i] = createTimedMetric(id, rangeBottom, rangeTop);
       // move the range bottom up to the last rangeTop
       rangeBottom = rangeTop;
     }
-    buckets[bucketRanges.length] = createTimedMetric(name, rangeBottom, 0);
-    return new DBucketTimer(name, bucketRanges, buckets);
+    buckets[bucketRanges.length] = createTimedMetric(id, rangeBottom, 0);
+    return new DBucketTimer(id, bucketRanges, buckets);
   }
 
-  private static Timer createTimedMetric(String name, int rangeBottom, int rangeTop) {
+  private static Timer createTimedMetric(Metric.ID id, int rangeBottom, int rangeTop) {
     String suffix = (rangeTop == 0) ? String.valueOf(rangeBottom) : rangeBottom + "-" + rangeTop;
-    return new DTimer(name, suffix);
+    return new DTimer(id, suffix);
   }
 
 }

metrics/src/main/java/io/avaje/metrics/core/CounterFactory.java

@@ -1,13 +1,14 @@
 package io.avaje.metrics.core;
 
 import io.avaje.metrics.Counter;
+import io.avaje.metrics.Metric;
 import io.avaje.metrics.spi.SpiMetricBuilder;
 
 final class CounterFactory implements SpiMetricBuilder.Factory<Counter> {
 
   @Override
-  public Counter createMetric(String name, int[] bucketRanges) {
-    return new DCounter(name);
+  public Counter createMetric(Metric.ID id, int[] bucketRanges) {
+    return new DCounter(id);
   }
 
 }