1 files changed, 123 insertions, 0 deletions
diff --git a/kamon-core/src/legacy-main/scala/kamon/metric/MetricsSettings.scala b/kamon-core/src/legacy-main/scala/kamon/metric/MetricsSettings.scala
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+++ b/kamon-core/src/legacy-main/scala/kamon/metric/MetricsSettings.scala
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+/*
+ * =========================================================================================
+ * Copyright © 2013-2015 the kamon project <http://kamon.io/>
+ *
+ * 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.
+ * =========================================================================================
+ */
+
+package kamon.metric
+
+import com.typesafe.config.Config
+import kamon.metric.instrument._
+import kamon.util.PathFilter
+import kamon.util.GlobPathFilter
+import kamon.util.RegexPathFilter
+
+import scala.concurrent.duration.FiniteDuration
+
+/**
+ *  Configuration settings for the Metrics extension, as read from the `kamon.metric` configuration key.
+ */
+case class MetricsSettings(
+    tickInterval: FiniteDuration,
+    defaultCollectionContextBufferSize: Int,
+    trackUnmatchedEntities: Boolean,
+    entityFilters: Map[String, EntityFilter],
+    instrumentFactories: Map[String, InstrumentFactory],
+    defaultInstrumentFactory: InstrumentFactory,
+    refreshScheduler: RefreshScheduler
+) {
+
+  private[kamon] def pointScheduler(targetScheduler: RefreshScheduler): Unit = refreshScheduler match {
+    case lrs: LazyRefreshScheduler ⇒ lrs.point(targetScheduler)
+    case others                    ⇒
+  }
+}
+
+/**
+ *
+ */
+case class EntityFilter(includes: List[PathFilter], excludes: List[PathFilter]) {
+  def accept(name: String): Boolean =
+    includes.exists(_.accept(name)) && !excludes.exists(_.accept(name))
+}
+
+object MetricsSettings {
+  import kamon.util.ConfigTools.Syntax
+
+  def apply(config: Config): MetricsSettings = {
+    val metricConfig = config.getConfig("kamon.metric")
+
+    val tickInterval = metricConfig.getFiniteDuration("tick-interval")
+    val collectBufferSize = metricConfig.getInt("default-collection-context-buffer-size")
+    val trackUnmatchedEntities = metricConfig.getBoolean("track-unmatched-entities")
+    val entityFilters = loadFilters(metricConfig.getConfig("filters"))
+    val defaultInstrumentSettings = DefaultInstrumentSettings.fromConfig(metricConfig.getConfig("default-instrument-settings"))
+
+    val refreshScheduler = new LazyRefreshScheduler
+    val instrumentFactories = loadInstrumentFactories(metricConfig.getConfig("instrument-settings"), defaultInstrumentSettings, refreshScheduler)
+    val defaultInstrumentFactory = new InstrumentFactory(Map.empty, defaultInstrumentSettings, refreshScheduler)
+
+    MetricsSettings(tickInterval, collectBufferSize, trackUnmatchedEntities, entityFilters, instrumentFactories,
+      defaultInstrumentFactory, refreshScheduler)
+  }
+
+  /**
+   *  Load all the default filters configured under the `kamon.metric.filters` configuration key. All filters are
+   *  defined with the entity category as a sub-key of the `kamon.metric.filters` key and two sub-keys to it: includes
+   *  and excludes with lists of string glob or regex patterns as values ('asRegex' defaults to false). Example:
+   *
+   *  {{{
+   *
+   *    kamon.metrics.filters {
+   *      actor {
+   *        includes = ["user/test-actor", "user/service/worker-*"]
+   *        excludes = ["user/IO-*"]
+   *        asRegex  = false
+   *      }
+   *    }
+   *
+   *  }}}
+   *
+   *  @return a Map from category name to corresponding entity filter.
+   */
+  def loadFilters(filtersConfig: Config): Map[String, EntityFilter] = {
+    import scala.collection.JavaConverters._
+
+    filtersConfig.firstLevelKeys map { category: String ⇒
+      val asRegex = if (filtersConfig.hasPath(s"$category.asRegex")) filtersConfig.getBoolean(s"$category.asRegex") else false
+      val includes = filtersConfig.getStringList(s"$category.includes").asScala.map(inc ⇒
+        if (asRegex) RegexPathFilter(inc) else new GlobPathFilter(inc)).toList
+      val excludes = filtersConfig.getStringList(s"$category.excludes").asScala.map(exc ⇒
+        if (asRegex) RegexPathFilter(exc) else new GlobPathFilter(exc)).toList
+
+      (category, EntityFilter(includes, excludes))
+    } toMap
+  }
+
+  /**
+   *  Load any custom configuration settings defined under the `kamon.metric.instrument-settings` configuration key and
+   *  create InstrumentFactories for them.
+   *
+   * @return a Map from category name to InstrumentFactory.
+   */
+  def loadInstrumentFactories(instrumentSettings: Config, defaults: DefaultInstrumentSettings, refreshScheduler: RefreshScheduler): Map[String, InstrumentFactory] = {
+    instrumentSettings.firstLevelKeys.map { category ⇒
+      val categoryConfig = instrumentSettings.getConfig(category)
+      val customSettings = categoryConfig.firstLevelKeys.map { instrumentName ⇒
+        (instrumentName, InstrumentCustomSettings.fromConfig(categoryConfig.getConfig(instrumentName)))
+      } toMap
+
+      (category, new InstrumentFactory(customSettings, defaults, refreshScheduler))
+    } toMap
+  }
+}