Add HikariCP module

instrumentation/hikaricp-2.4.0/README.md

@@ -0,0 +1,12 @@
+# hikaricp-2.4.0 Instrumentation Module
+
+### Important Note Regarding Use of the Legacy HikariCP Extension Module
+This built in instrumentation module replaces the extension module that can be downloaded from the New Relic
+[download size](https://download.newrelic.com/newrelic/java-agent/extensions/). The `hikaricp-2.4.0.jar` 
+artifact should be removed from the agent's `extension` folder if present.
+
+### Reported Metrics
+Every 5 seconds, the following metrics will be reported:
+- `Database Connection/HikariCP/{PoolName}/Busy Count[connections]`: Retrieved from the [HikariPoolMXBean](https://www.javadoc.io/doc/com.zaxxer/HikariCP/2.4.6/com/zaxxer/hikari/HikariPoolMXBean.html) instance
+- `Database Connection/HikariCP/{PoolName}/Idle Count[connections]`: Retrieved from the [HikariPoolMXBean](https://www.javadoc.io/doc/com.zaxxer/HikariCP/2.4.6/com/zaxxer/hikari/HikariPoolMXBean.html) instance
+- `Database Connection/HikariCP/{PoolName}/Max Pool Size[connections]`: Retrieved from the [HikariConfig](https://www.javadoc.io/static/com.zaxxer/HikariCP/2.4.6/index.html?com/zaxxer/hikari/pool/HikariPool.html) instance

instrumentation/hikaricp-2.4.0/build.gradle

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+dependencies {
+    implementation(project(":agent-bridge"))
+    implementation("com.zaxxer:HikariCP:2.4.1")
+}
+
+jar {
+    manifest {
+        attributes 'Implementation-Title': 'com.newrelic.instrumentation.hikaricp-2.4.0'
+    }
+}
+
+verifyInstrumentation {
+    passesOnly 'com.zaxxer:HikariCP:[2.4.0,)'
+}
+
+site {
+    title 'HikariCP'
+    type 'Datastore'
+}

instrumentation/hikaricp-2.4.0/src/main/java/com/zaxxer/hikari/pool/HikariPool_Instrumentation.java

@@ -0,0 +1,23 @@
+/*
+ *
+ *  * Copyright 2024 New Relic Corporation. All rights reserved.
+ *  * SPDX-License-Identifier: Apache-2.0
+ *
+ */
+package com.zaxxer.hikari.pool;
+
+import java.util.concurrent.TimeUnit;
+
+import com.newrelic.agent.bridge.AgentBridge;
+import com.newrelic.api.agent.weaver.MatchType;
+import com.newrelic.api.agent.weaver.Weave;
+import com.zaxxer.hikari.HikariConfig;
+import com.zaxxer.hikari.HikariPoolMXBean;
+
+@Weave(originalName = "com.zaxxer.hikari.pool.HikariPool", type = MatchType.ExactClass)
+public abstract class HikariPool_Instrumentation implements HikariPoolMXBean {
+
+    public HikariPool_Instrumentation(HikariConfig config) {
+        AgentBridge.privateApi.addSampler(new PooledDataSourceSampler(this, config), 5, TimeUnit.SECONDS);
+    }
+}

instrumentation/hikaricp-2.4.0/src/main/java/com/zaxxer/hikari/pool/PooledDataSourceSampler.java

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+/*
+ *
+ *  * Copyright 2024 New Relic Corporation. All rights reserved.
+ *  * SPDX-License-Identifier: Apache-2.0
+ *
+ */
+package com.zaxxer.hikari.pool;
+
+import com.newrelic.api.agent.MetricAggregator;
+import com.newrelic.api.agent.NewRelic;
+import com.zaxxer.hikari.HikariConfig;
+
+import java.lang.ref.WeakReference;
+
+/**
+ * This sampler keeps a weak reference to a BaseHikariPool and
+ * reports metrics about it.
+ */
+public class PooledDataSourceSampler implements Runnable {
+
+    private final WeakReference<HikariPool_Instrumentation> hikariPoolRef;
+    private final WeakReference<HikariConfig> hikariConfigRef;
+    private final String baseName;
+
+    public PooledDataSourceSampler(HikariPool_Instrumentation hikariPool, HikariConfig config) {
+        this.hikariPoolRef = new WeakReference<>(hikariPool);
+        this.hikariConfigRef = new WeakReference<>(config);
+        this.baseName = "Database Connection/HikariCP/" + config.getPoolName() + '/';
+    }
+
+    @Override
+    public void run() {
+        HikariPool_Instrumentation hikariPool = hikariPoolRef.get();
+        HikariConfig config = hikariConfigRef.get();
+        if (null == hikariPool || null == config) {
+            return;
+        }
+
+        MetricAggregator metricAggregator = NewRelic.getAgent().getMetricAggregator();
+        metricAggregator.recordMetric(baseName + "Busy Count[connections]", hikariPool.getActiveConnections());
+        metricAggregator.recordMetric(baseName + "Idle Count[connections]", hikariPool.getIdleConnections());
+        NewRelic.getAgent().getMetricAggregator().recordMetric(baseName + "Max Pool Size[connections]", config.getMaximumPoolSize());
+    }
+}

settings.gradle

@@ -124,6 +124,7 @@ include 'instrumentation:hibernate-3.5'
 include 'instrumentation:hibernate-4.0'
 include 'instrumentation:hibernate-4.2'
 include 'instrumentation:hibernate-4.3'
+include 'instrumentation:hikaricp-2.4.0'
 include 'instrumentation:http4s-blaze-server-2.13_0.21'
 include 'instrumentation:http4s-blaze-server-2.12_0.21'
 include 'instrumentation:http4s-blaze-server-2.13_0.22'