api: Use package-private IgnoreJRERequirement

This avoids the dependency on animalsniffer-annotations. grpc-api, and
particularly grpc-context, are used many low-level places and it is
beneficial for them to be very low dependency. This brings grpc-context
back to zero-dependency.

api/BUILD.bazel

@@ -13,6 +13,5 @@ java_library(
         artifact("com.google.errorprone:error_prone_annotations"),
         artifact("com.google.guava:failureaccess"),  # future transitive dep of Guava. See #5214
         artifact("com.google.guava:guava"),
-        artifact("org.codehaus.mojo:animal-sniffer-annotations"),
     ],
 )

api/build.gradle

@@ -36,7 +36,6 @@ tasks.named("jar").configure {
 dependencies {
     compileOnly sourceSets.context.output
     api libraries.jsr305,
-            libraries.animalsniffer.annotations,
             libraries.errorprone.annotations
     implementation libraries.guava
 
@@ -61,6 +60,10 @@ dependencies {
     }
 }
 
+animalsniffer {
+    annotation = 'io.grpc.IgnoreJRERequirement'
+}
+
 tasks.named("javadoc").configure {
     source sourceSets.context.allSource
     // We want io.grpc.Internal, but not io.grpc.Internal*

api/src/main/java/io/grpc/IgnoreJRERequirement.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2024 The gRPC Authors
+ *
+ * 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 io.grpc;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Target;
+
+/**
+ * Disables Animal Sniffer's signature checking. This is our own package-private version to avoid
+ * dependening on animalsniffer-annotations.
+ *
+ * <p>FIELD is purposefully not supported, as Android wouldn't be able to ignore a field. Instead,
+ * the entire class would need to be avoided on Android.
+ */
+@Target({ElementType.METHOD, ElementType.CONSTRUCTOR, ElementType.TYPE})
+@interface IgnoreJRERequirement {}

api/src/main/java/io/grpc/TimeUtils.java

@@ -17,7 +17,6 @@
 package io.grpc;
 
 import java.time.Duration;
-import org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement;
 
 final class TimeUtils {
   private TimeUtils() {}

api/src/test/java/io/grpc/CallOptionsTest.java

@@ -34,7 +34,6 @@ import io.grpc.ClientStreamTracer.StreamInfo;
 import io.grpc.internal.SerializingExecutor;
 import java.time.Duration;
 import java.util.concurrent.Executor;
-import org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;

api/src/test/java/io/grpc/SynchronizationContextTest.java

@@ -36,7 +36,6 @@ import java.util.concurrent.ScheduledFuture;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicReference;
-import org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement;
 import org.junit.After;
 import org.junit.Rule;
 import org.junit.Test;

api/src/test/java/io/grpc/TimeUtilsTest.java

@@ -19,7 +19,6 @@ package io.grpc;
 import static org.junit.Assert.assertEquals;
 
 import java.time.Duration;
-import org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;

buildscripts/checkstyle.xml

@@ -38,6 +38,12 @@
         <property name="ignorePattern" value="^package.*|^import.*|a href|href|http://|https://|ftp://"/>
     </module>
 
+    <module name="SuppressionSingleFilter">
+        <!-- Prefer using the same name as in Animal Sniffer -->
+        <property name="checks" value="AbbreviationAsWordInName"/>
+        <property name="files" value="IgnoreJRERequirement.java"/>
+    </module>
+
     <module name="TreeWalker">
         <module name="OuterTypeFilename"/>
         <module name="IllegalTokenText">

netty/build.gradle

@@ -17,6 +17,7 @@ tasks.named("jar").configure {
 
 dependencies {
     api project(':grpc-api'),
+            libraries.animalsniffer.annotations,
             libraries.netty.codec.http2
     implementation project(':grpc-core'),
             libs.netty.handler.proxy,

stub/build.gradle

@@ -16,6 +16,7 @@ tasks.named("jar").configure {
 
 dependencies {
     api project(':grpc-api'),
+        libraries.animalsniffer.annotations,
         libraries.guava
     implementation libraries.errorprone.annotations
     testImplementation libraries.truth,