Opamp first iteration completion

buildSrc/build.gradle.kts

@@ -16,6 +16,7 @@ dependencies {
   implementation("net.ltgt.gradle:gradle-errorprone-plugin:4.3.0")
   implementation("net.ltgt.gradle:gradle-nullaway-plugin:2.2.0")
   implementation("org.owasp:dependency-check-gradle:12.1.3")
+  implementation("ru.vyarus.animalsniffer:ru.vyarus.animalsniffer.gradle.plugin:2.0.1")
 }
 
 spotless {

buildSrc/src/main/kotlin/otel.animalsniffer-conventions.gradle.kts

@@ -0,0 +1,19 @@
+import ru.vyarus.gradle.plugin.animalsniffer.AnimalSniffer
+
+plugins {
+  id("otel.java-conventions")
+  id("ru.vyarus.animalsniffer")
+}
+
+dependencies {
+  signature("com.toasttab.android:gummy-bears-api-21:0.12.0:coreLib@signature")
+}
+
+animalsniffer {
+  sourceSets = listOf(java.sourceSets.main.get())
+}
+
+// Always having declared output makes this task properly participate in tasks up-to-date checks
+tasks.withType<AnimalSniffer> {
+  reports.text.required.set(true)
+}

disk-buffering/build.gradle.kts

@@ -1,12 +1,11 @@
 import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
-import ru.vyarus.gradle.plugin.animalsniffer.AnimalSniffer
 
 plugins {
   id("otel.java-conventions")
   id("otel.publish-conventions")
+  id("otel.animalsniffer-conventions")
   id("com.gradleup.shadow")
   id("me.champeau.jmh") version "0.7.3"
-  id("ru.vyarus.animalsniffer") version "2.0.1"
   id("com.squareup.wire") version "5.3.11"
 }
 
@@ -20,27 +19,12 @@ dependencies {
   implementation("io.opentelemetry:opentelemetry-api-incubator")
   compileOnly("com.google.auto.value:auto-value-annotations")
   annotationProcessor("com.google.auto.value:auto-value")
-  signature("com.toasttab.android:gummy-bears-api-21:0.12.0:coreLib@signature")
   testImplementation("org.mockito:mockito-inline")
   testImplementation("io.opentelemetry:opentelemetry-sdk-testing")
 
   protos("io.opentelemetry.proto:opentelemetry-proto:1.7.0-alpha@jar")
 }
 
-animalsniffer {
-  sourceSets = listOf(java.sourceSets.main.get())
-}
-
-// Always having declared output makes this task properly participate in tasks up-to-date checks
-tasks.withType<AnimalSniffer> {
-  reports.text.required.set(true)
-}
-
-// Attaching animalsniffer check to the compilation process.
-tasks.named("classes").configure {
-  finalizedBy("animalsnifferMain")
-}
-
 jmh {
   warmupIterations.set(0)
   fork.set(2)

opamp-client/README.md

@@ -3,6 +3,56 @@
 Java implementation of the OpAMP
 client [spec](https://github.com/open-telemetry/opamp-spec/blob/main/specification.md).
 
+> [!WARNING]
+> This is an incubating feature. Breaking changes can happen on a new release without previous
+> notice and without backward compatibility guarantees.
+
+## Usage
+
+```java
+// Initializing it
+
+RequestService requestService = HttpRequestService.create(OkHttpSender.create("[OPAMP_SERVICE_URL]"));
+// RequestService requestService = WebSocketRequestService.create(OkHttpWebSocket.create("[OPAMP_SERVICE_URL]")); // Use this instead to connect to the server via WebSocket.
+OpampClient client =
+    OpampClient.builder()
+        .putIdentifyingAttribute("service.name", "My service name")
+        .enableRemoteConfig()
+        .setRequestService(requestService)
+        .build(
+            new OpampClient.Callbacks() {
+              @Override
+              public void onConnect() {}
+
+              @Override
+              public void onConnectFailed(@Nullable Throwable throwable) {}
+
+              @Override
+              public void onErrorResponse(ServerErrorResponse errorResponse) {}
+
+              @Override
+              public void onMessage(MessageData messageData) {
+                AgentRemoteConfig remoteConfig = messageData.getRemoteConfig();
+                if (remoteConfig != null) {
+                  // A remote config was received
+
+                  // After applying it...
+                  client.setRemoteConfigStatus(
+                      new RemoteConfigStatus.Builder()
+                          .status(RemoteConfigStatuses.RemoteConfigStatuses_APPLIED)
+                          .build());
+                }
+              }
+            });
+
+// State update
+client.setAgentDescription(new AgentDescription.Builder().build());
+
+// App shutdown
+client.close();
+
+```
+
 ## Component owners
 
 - [Cesar Munoz](https://github.com/LikeTheSalad), Elastic

opamp-client/build.gradle.kts

@@ -4,6 +4,8 @@ import java.net.URL
 
 plugins {
   id("otel.java-conventions")
+  id("otel.publish-conventions")
+  id("otel.animalsniffer-conventions")
   id("de.undercouch.download") version "5.6.0"
   id("com.squareup.wire") version "5.3.11"
 }
@@ -14,6 +16,7 @@ otelJava.moduleName.set("io.opentelemetry.contrib.opamp.client")
 dependencies {
   implementation("com.squareup.okhttp3:okhttp")
   implementation("com.github.f4b6a3:uuid-creator")
+  implementation("io.opentelemetry:opentelemetry-api")
   annotationProcessor("com.google.auto.value:auto-value")
   compileOnly("com.google.auto.value:auto-value-annotations")
   testImplementation("org.mockito:mockito-inline")

opamp-client/src/main/java/io/opentelemetry/opamp/client/internal/OpampClient.java

@@ -6,45 +6,23 @@
 package io.opentelemetry.opamp.client.internal;
 
 import io.opentelemetry.opamp.client.internal.response.MessageData;
+import java.io.Closeable;
 import javax.annotation.Nullable;
 import opamp.proto.AgentDescription;
 import opamp.proto.RemoteConfigStatus;
 import opamp.proto.ServerErrorResponse;
 
-public interface OpampClient {
+public interface OpampClient extends Closeable {
 
   static OpampClientBuilder builder() {
     return new OpampClientBuilder();
   }
 
   /**
-   * Starts the client and begin attempts to connect to the Server. Once connection is established
-   * the client will attempt to maintain it by reconnecting if the connection is lost. All failed
-   * connection attempts will be reported via {@link Callbacks#onConnectFailed(Throwable)} callback.
-   *
-   * <p>This method does not wait until the connection to the Server is established and will likely
-   * return before the connection attempts are even made.
-   *
-   * <p>This method may be called only once.
-   *
-   * @param callbacks The Callback to which the Client will notify about any Server requests and
-   *     responses.
-   */
-  void start(Callbacks callbacks);
-
-  /**
-   * Stops the client. May be called only after {@link #start(Callbacks)}. May be called only once.
-   * After this call returns successfully it is guaranteed that no callbacks will be called. Once
-   * stopped, the client cannot be started again.
-   */
-  void stop();
-
-  /**
-   * Sets attributes of the Agent. The attributes will be included in the next status report sent to
-   * the Server. When called after {@link #start(Callbacks)}, the attributes will be included in the
-   * next outgoing status report. This is typically used by Agents which allow their
-   * AgentDescription to change dynamically while the OpAMPClient is started. May be also called
-   * from {@link Callbacks#onMessage(MessageData)}.
+   * Sets attributes of the Agent. The attributes will be included in the next outgoing status
+   * report. This is typically used by Agents which allow their AgentDescription to change
+   * dynamically while the OpAMPClient is started. May be also called from {@link
+   * Callbacks#onMessage(MessageData)}.
    *
    * @param agentDescription The new agent description.
    */
@@ -59,16 +37,14 @@ static OpampClientBuilder builder() {
 
   interface Callbacks {
     /**
-     * Called when the connection is successfully established to the Server. May be called after
-     * {@link #start(Callbacks)} is called and every time a connection is established to the Server.
-     * For WebSocket clients this is called after the handshake is completed without any error. For
-     * HTTP clients this is called for any request if the response status is OK.
+     * Called when the connection is successfully established to the Server. For WebSocket clients
+     * this is called after the handshake is completed without any error. For HTTP clients this is
+     * called for any request if the response status is OK.
      */
     void onConnect();
 
     /**
-     * Called when the connection to the Server cannot be established. May be called after {@link
-     * #start(Callbacks)} is called and tries to connect to the Server. May also be called if the
+     * Called when the connection to the Server cannot be established. May also be called if the
      * connection is lost and reconnection attempt fails.
      *
      * @param throwable The exception.

opamp-client/src/main/java/io/opentelemetry/opamp/client/internal/OpampClientBuilder.java

@@ -381,11 +381,7 @@ public OpampClientBuilder setEffectiveConfigState(State.EffectiveConfig effectiv
     return this;
   }
 
-  public OpampClient build() {
-    if (service == null) {
-      throw new IllegalStateException(
-          "The request service is not set. You must provide it by calling setRequestService()");
-    }
+  public OpampClient build(OpampClient.Callbacks callbacks) {
     List<KeyValue> protoIdentifyingAttributes = new ArrayList<>();
     List<KeyValue> protoNonIdentifyingAttributes = new ArrayList<>();
     identifyingAttributes.forEach(
@@ -411,7 +407,7 @@ public OpampClient build() {
             new State.InstanceUid(instanceUid),
             new State.Flags(0L),
             effectiveConfigState);
-    return OpampClientImpl.create(service, state);
+    return OpampClientImpl.create(service, state, callbacks);
   }
 
   private static State.EffectiveConfig createEffectiveConfigNoop() {

opamp-client/src/main/java/io/opentelemetry/opamp/client/internal/connectivity/http/OkHttpSender.java

@@ -5,6 +5,7 @@
 
 package io.opentelemetry.opamp.client.internal.connectivity.http;
 
+import io.opentelemetry.api.internal.InstrumentationUtil;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.concurrent.CompletableFuture;
@@ -13,6 +14,7 @@
 import okhttp3.Callback;
 import okhttp3.MediaType;
 import okhttp3.OkHttpClient;
+import okhttp3.Request;
 import okhttp3.RequestBody;
 import okio.BufferedSink;
 
@@ -45,8 +47,16 @@ public CompletableFuture<Response> send(BodyWriter writer, int contentLength) {
     RequestBody body = new RawRequestBody(writer, contentLength, MEDIA_TYPE);
     builder.post(body);
 
+    // By suppressing instrumentations, we prevent automatic instrumentations for the okhttp request
+    // that polls the opamp server.
+    InstrumentationUtil.suppressInstrumentation(() -> doSendRequest(builder.build(), future));
+
+    return future;
+  }
+
+  private void doSendRequest(Request request, CompletableFuture<Response> future) {
     client
-        .newCall(builder.build())
+        .newCall(request)
         .enqueue(
             new Callback() {
               @Override
@@ -59,8 +69,6 @@ public void onFailure(Call call, IOException e) {
                 future.completeExceptionally(e);
               }
             });
-
-    return future;
   }
 
   private static class OkHttpResponse implements Response {