1 files changed, 63 insertions, 0 deletions
diff --git a/simplemetrics/src/main/java/com/yahoo/metrics/simple/MetricManager.java b/simplemetrics/src/main/java/com/yahoo/metrics/simple/MetricManager.java
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+++ b/simplemetrics/src/main/java/com/yahoo/metrics/simple/MetricManager.java
@@ -0,0 +1,63 @@
+// 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 java.util.concurrent.ScheduledThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.logging.Logger;
+
+import com.yahoo.component.AbstractComponent;
+import com.yahoo.concurrent.ThreadLocalDirectory;
+import com.yahoo.concurrent.ThreadLocalDirectory.Updater;
+import com.yahoo.container.di.componentgraph.Provider;
+import com.yahoo.metrics.ManagerConfig;
+import com.yahoo.log.LogLevel;
+
+/**
+ * This is the coordinating class owning the executor and the top level objects
+ * for measured metrics.
+ *
+ * @author <a href="mailto:steinar@yahoo-inc.com">Steinar Knutsen</a>
+ */
+public class MetricManager extends AbstractComponent implements Provider<MetricReceiver> {
+    private static Logger log = Logger.getLogger(MetricManager.class.getName());
+
+    private final ScheduledThreadPoolExecutor executor;
+    private final MetricReceiver receiver;
+    private ThreadLocalDirectory<Bucket, Sample> metricsCollection;
+
+    public MetricManager(ManagerConfig settings) {
+        this(settings, new MetricUpdater());
+    }
+
+    private MetricManager(ManagerConfig settings, Updater<Bucket, Sample> updater) {
+        log.log(LogLevel.CONFIG, "setting up simple metrics gathering." +
+                    " reportPeriodSeconds=" + settings.reportPeriodSeconds() +
+                    ", pointsToKeepPerMetric=" + settings.pointsToKeepPerMetric());
+        metricsCollection = new ThreadLocalDirectory<>(updater);
+        final AtomicReference<Bucket> currentSnapshot = new AtomicReference<>(null);
+        executor = new ScheduledThreadPoolExecutor(1);
+        // Fixed rate, not fixed delay, is it is not too important that each
+        // bucket has data for exactly one second, but one should strive for
+        // this.buffer to contain data for as close a period to the report
+        // interval as possible
+        executor.scheduleAtFixedRate(new MetricAggregator(metricsCollection, currentSnapshot, settings), 1, 1, TimeUnit.SECONDS);
+        receiver = new MetricReceiver(metricsCollection, currentSnapshot);
+    }
+
+    static MetricManager constructWithCustomUpdater(ManagerConfig settings, Updater<Bucket, Sample> updater) {
+        return new MetricManager(settings, updater);
+    }
+
+
+    @Override
+    public void deconstruct() {
+        executor.shutdown();
+    }
+
+    @Override
+    public MetricReceiver get() {
+        return receiver;
+    }
+
+}