enforce static imports (#12009)

Author: zeitlinger

buildscripts/checkstyle.xml

@@ -50,6 +50,18 @@
   -->
 
   <module name="TreeWalker">
+    <module name="RegexpSinglelineJava">
+      <property name="format"
+                value="(?&lt;!import static io.opentelemetry.sdk.testing.assertj.)OpenTelemetryAssertions\."/>
+      <property name="message"
+                value="Please statically import methods from OpenTelemetryAssertions"/>
+    </module>
+    <module name="RegexpSinglelineJava">
+      <property name="format"
+                value="(?&lt;!import static org.assertj.core.api.|OpenTelemetry)Assertions.assertThat"/>
+      <property name="message"
+                value="Please statically import methods from Assertions (OpenTelemetryAssertions extends Assertions)"/>
+    </module>
     <module name="OuterTypeFilename"/>
     <module name="IllegalTokenText">
       <property name="tokens" value="STRING_LITERAL, CHAR_LITERAL"/>

docs/contributing/style-guideline.md

@@ -67,6 +67,11 @@ rough guideline of what are commonly accepted static imports:
 - Singleton instances (especially where clearly named and hopefully immutable)
 - `tracer()` methods that expose tracer singleton instances
 
+Some of these are enforced by checkstyle rules:
+
+- look for `RegexpSinglelineJava` in `checkstyle.xml`
+- use `@SuppressWarnings("checkstyle:RegexpSinglelineJava")` to suppress the checkstyle warning
+
 ## Ordering of class contents
 
 The following order is preferred:

instrumentation-api-incubator/src/test/java/io/opentelemetry/instrumentation/api/incubator/semconv/messaging/MessagingProducerMetricsTest.java

@@ -5,8 +5,8 @@
 
 package io.opentelemetry.instrumentation.api.incubator.semconv.messaging;
 
+import static io.opentelemetry.sdk.testing.assertj.OpenTelemetryAssertions.assertThat;
 import static io.opentelemetry.sdk.testing.assertj.OpenTelemetryAssertions.equalTo;
-import static org.assertj.core.api.Assertions.assertThat;
 
 import io.opentelemetry.api.common.Attributes;
 import io.opentelemetry.api.trace.Span;
@@ -16,7 +16,6 @@
 import io.opentelemetry.context.Context;
 import io.opentelemetry.instrumentation.api.instrumenter.OperationListener;
 import io.opentelemetry.sdk.metrics.SdkMeterProvider;
-import io.opentelemetry.sdk.testing.assertj.OpenTelemetryAssertions;
 import io.opentelemetry.sdk.testing.exporter.InMemoryMetricReader;
 import io.opentelemetry.semconv.ServerAttributes;
 import io.opentelemetry.semconv.incubating.MessagingIncubatingAttributes;
@@ -76,7 +75,7 @@ void collectsMetrics() {
     assertThat(metricReader.collectAllMetrics())
         .satisfiesExactlyInAnyOrder(
             metric ->
-                OpenTelemetryAssertions.assertThat(metric)
+                assertThat(metric)
                     .hasName("messaging.publish.duration")
                     .hasUnit("s")
                     .hasDescription("Measures the duration of publish operation.")
@@ -112,7 +111,7 @@ void collectsMetrics() {
     assertThat(metricReader.collectAllMetrics())
         .satisfiesExactlyInAnyOrder(
             metric ->
-                OpenTelemetryAssertions.assertThat(metric)
+                assertThat(metric)
                     .hasName("messaging.publish.duration")
                     .hasHistogramSatisfying(
                         histogram ->

instrumentation-api/src/test/java/io/opentelemetry/instrumentation/api/internal/OperationMetricsUtilTest.java

@@ -5,6 +5,8 @@
 
 package io.opentelemetry.instrumentation.api.internal;
 
+import static org.assertj.core.api.Assertions.assertThat;
+
 import io.opentelemetry.api.metrics.DoubleHistogramBuilder;
 import io.opentelemetry.api.metrics.Meter;
 import io.opentelemetry.api.metrics.MeterProvider;
@@ -13,7 +15,6 @@
 import io.opentelemetry.instrumentation.testing.junit.LibraryInstrumentationExtension;
 import java.lang.reflect.Proxy;
 import java.util.concurrent.atomic.AtomicBoolean;
-import org.assertj.core.api.Assertions;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.RegisterExtension;
 
@@ -29,7 +30,7 @@ void noWarning() {
             "test metrics", meter -> null, (s, doubleHistogramBuilder) -> warning.set(true));
     operationMetrics.create(testing.getOpenTelemetry().getMeter("test"));
 
-    Assertions.assertThat(warning).isFalse();
+    assertThat(warning).isFalse();
   }
 
   @Test
@@ -40,7 +41,7 @@ void noWarningWithNoopMetrics() {
             "test metrics", meter -> null, (s, doubleHistogramBuilder) -> warning.set(true));
     operationMetrics.create(MeterProvider.noop().get("test"));
 
-    Assertions.assertThat(warning).isFalse();
+    assertThat(warning).isFalse();
   }
 
   @Test
@@ -65,7 +66,7 @@ void warning() {
                 });
     operationMetrics.create(meter);
 
-    Assertions.assertThat(warning).isTrue();
+    assertThat(warning).isTrue();
   }
 
   private static DoubleHistogramBuilder proxyDoubleHistogramBuilder(Meter meter) {

instrumentation/grails-3.0/javaagent/src/test/java/test/GrailsTest.java

@@ -35,7 +35,6 @@
 import java.util.Locale;
 import java.util.Map;
 import java.util.function.Consumer;
-import org.assertj.core.api.Assertions;
 import org.junit.jupiter.api.extension.RegisterExtension;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.autoconfigure.web.ServerProperties;
@@ -183,8 +182,7 @@ public List<Consumer<SpanDataAssert>> errorPageSpanAssertions(
     if (endpoint == NOT_FOUND) {
       spanAssertions.add(
           span ->
-              span.satisfies(
-                      spanData -> Assertions.assertThat(spanData.getName()).endsWith(".sendError"))
+              span.satisfies(spanData -> assertThat(spanData.getName()).endsWith(".sendError"))
                   .hasKind(SpanKind.INTERNAL)
                   .hasAttributesSatisfying(Attributes::isEmpty));
     }

instrumentation/grpc-1.6/library/src/test/java/io/opentelemetry/instrumentation/grpc/v1_6/GrpcTest.java

@@ -5,6 +5,8 @@
 
 package io.opentelemetry.instrumentation.grpc.v1_6;
 
+import static org.assertj.core.api.Assertions.assertThat;
+
 import example.GreeterGrpc;
 import example.Helloworld;
 import io.grpc.BindableService;
@@ -23,7 +25,6 @@
 import io.opentelemetry.instrumentation.api.instrumenter.AttributesExtractor;
 import io.opentelemetry.instrumentation.testing.junit.InstrumentationExtension;
 import io.opentelemetry.instrumentation.testing.junit.LibraryInstrumentationExtension;
-import io.opentelemetry.sdk.testing.assertj.OpenTelemetryAssertions;
 import java.util.Collections;
 import java.util.concurrent.TimeUnit;
 import javax.annotation.Nullable;
@@ -124,7 +125,7 @@ public void sayHello(
                 "parent",
                 () -> client.sayHello(Helloworld.Request.newBuilder().setName("test").build()));
 
-    OpenTelemetryAssertions.assertThat(response.getMessage()).isEqualTo("Hello test");
+    assertThat(response.getMessage()).isEqualTo("Hello test");
 
     testing()
         .waitAndAssertTraces(

instrumentation/grpc-1.6/testing/src/main/java/io/opentelemetry/instrumentation/grpc/v1_6/AbstractGrpcTest.java

@@ -46,7 +46,6 @@
 import io.opentelemetry.instrumentation.testing.junit.InstrumentationExtension;
 import io.opentelemetry.instrumentation.testing.util.ThrowingRunnable;
 import io.opentelemetry.sdk.testing.assertj.AttributeAssertion;
-import io.opentelemetry.sdk.testing.assertj.OpenTelemetryAssertions;
 import io.opentelemetry.sdk.trace.data.StatusData;
 import io.opentelemetry.semconv.NetworkAttributes;
 import io.opentelemetry.semconv.ServerAttributes;
@@ -1643,7 +1642,7 @@ public void sayHello(
                 "parent",
                 () -> client.sayHello(Helloworld.Request.newBuilder().setName("test").build()));
 
-    OpenTelemetryAssertions.assertThat(response.getMessage()).isEqualTo("Hello test");
+    assertThat(response.getMessage()).isEqualTo("Hello test");
 
     testing()
         .waitAndAssertTraces(

instrumentation/lettuce/lettuce-5.1/testing/src/main/java/io/opentelemetry/instrumentation/lettuce/v5_1/AbstractLettuceSyncClientAuthTest.java

@@ -6,11 +6,11 @@
 package io.opentelemetry.instrumentation.lettuce.v5_1;
 
 import static io.opentelemetry.sdk.testing.assertj.OpenTelemetryAssertions.equalTo;
+import static io.opentelemetry.sdk.testing.assertj.OpenTelemetryAssertions.satisfies;
 import static org.assertj.core.api.Assertions.assertThat;
 
 import io.lettuce.core.api.sync.RedisCommands;
 import io.opentelemetry.api.trace.SpanKind;
-import io.opentelemetry.sdk.testing.assertj.OpenTelemetryAssertions;
 import io.opentelemetry.semconv.NetworkAttributes;
 import io.opentelemetry.semconv.ServerAttributes;
 import io.opentelemetry.semconv.incubating.DbIncubatingAttributes;
@@ -90,7 +90,7 @@ void testAuthCommand() throws Exception {
                                   equalTo(ServerAttributes.SERVER_ADDRESS, host),
                                   equalTo(ServerAttributes.SERVER_PORT, port),
                                   equalTo(DbIncubatingAttributes.DB_SYSTEM, "redis"),
-                                  OpenTelemetryAssertions.satisfies(
+                                  satisfies(
                                       DbIncubatingAttributes.DB_STATEMENT,
                                       stringAssert ->
                                           stringAssert.startsWith("CLIENT SETINFO lib-ver")))),

instrumentation/lettuce/lettuce-5.1/testing/src/main/java/io/opentelemetry/instrumentation/lettuce/v5_1/AbstractLettuceSyncClientTest.java

@@ -6,6 +6,7 @@
 package io.opentelemetry.instrumentation.lettuce.v5_1;
 
 import static io.opentelemetry.sdk.testing.assertj.OpenTelemetryAssertions.equalTo;
+import static io.opentelemetry.sdk.testing.assertj.OpenTelemetryAssertions.satisfies;
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.catchThrowable;
@@ -20,7 +21,6 @@
 import io.opentelemetry.api.common.AttributeKey;
 import io.opentelemetry.api.trace.SpanKind;
 import io.opentelemetry.instrumentation.test.utils.PortUtils;
-import io.opentelemetry.sdk.testing.assertj.OpenTelemetryAssertions;
 import io.opentelemetry.semconv.NetworkAttributes;
 import io.opentelemetry.semconv.ServerAttributes;
 import io.opentelemetry.semconv.incubating.DbIncubatingAttributes;
@@ -396,7 +396,7 @@ void testDebugSegfaultCommandWithNoArgumentProducesNoSpan() {
                                   equalTo(ServerAttributes.SERVER_ADDRESS, host),
                                   equalTo(ServerAttributes.SERVER_PORT, containerConnection.port),
                                   equalTo(DbIncubatingAttributes.DB_SYSTEM, "redis"),
-                                  OpenTelemetryAssertions.satisfies(
+                                  satisfies(
                                       DbIncubatingAttributes.DB_STATEMENT,
                                       stringAssert ->
                                           stringAssert.startsWith("CLIENT SETINFO lib-ver")))),

instrumentation/log4j/log4j-appender-2.17/library/src/test/java/io/opentelemetry/instrumentation/log4j/appender/v2_17/LogReplayOpenTelemetryAppenderTest.java

@@ -6,11 +6,10 @@
 package io.opentelemetry.instrumentation.log4j.appender.v2_17;
 
 import static io.opentelemetry.api.common.AttributeKey.stringKey;
+import static io.opentelemetry.sdk.testing.assertj.OpenTelemetryAssertions.assertThat;
 import static io.opentelemetry.sdk.testing.assertj.OpenTelemetryAssertions.equalTo;
-import static org.assertj.core.api.Assertions.assertThat;
 
 import io.opentelemetry.sdk.logs.data.LogRecordData;
-import io.opentelemetry.sdk.testing.assertj.OpenTelemetryAssertions;
 import java.util.List;
 import org.apache.logging.log4j.message.StringMapMessage;
 import org.apache.logging.log4j.message.StructuredDataMessage;
@@ -45,7 +44,7 @@ void twoLogs() {
 
     List<LogRecordData> logDataList = logRecordExporter.getFinishedLogRecordItems();
     assertThat(logDataList).hasSize(1);
-    OpenTelemetryAssertions.assertThat(logDataList.get(0))
+    assertThat(logDataList.get(0))
         .hasResource(resource)
         .hasInstrumentationScope(instrumentationScopeInfo)
         .hasBody("log message 1");
@@ -69,7 +68,7 @@ void twoLogsStringMapMessage() {
 
     List<LogRecordData> logDataList = logRecordExporter.getFinishedLogRecordItems();
     assertThat(logDataList).hasSize(1);
-    OpenTelemetryAssertions.assertThat(logDataList.get(0))
+    assertThat(logDataList.get(0))
         .hasResource(resource)
         .hasInstrumentationScope(instrumentationScopeInfo)
         .hasAttributesSatisfyingExactly(
@@ -94,7 +93,7 @@ void twoLogsStructuredDataMessage() {
 
     List<LogRecordData> logDataList = logRecordExporter.getFinishedLogRecordItems();
     assertThat(logDataList).hasSize(1);
-    OpenTelemetryAssertions.assertThat(logDataList.get(0))
+    assertThat(logDataList.get(0))
         .hasResource(resource)
         .hasInstrumentationScope(instrumentationScopeInfo)
         .hasBody("a message")