std::string(result.error_message()).data());
    if (TF_GetCode(&s) != TF_Code::TF_OK) {
      tensorflow::CoordinationServiceError error;
      *error.mutable_source_task() = result.error_payload().source_task();
      TF_SetPayload(&s, tensorflow::CoordinationErrorPayloadKey().data(),
                    error.SerializeAsString().c_str());
    }
    *state_iter = std::move(s);
    ++state_iter;
  }

        """)
        File(codeQualityDir, "src/main/java/org/gradle/quality").mkdirs()
        File(codeQualityDir, "src/main/java/org/gradle/quality/SourceTask.java").writeText("""
            package org.gradle.quality;
            import org.gradle.api.DefaultTask;
            public class SourceTask extends DefaultTask {}
        """)
        File(codeQualityDir, "src/main/java/org/gradle/quality/Checkstyle.java").writeText("""

import org.gradle.api.tasks.OutputDirectory;
import org.gradle.api.tasks.PathSensitive;
import org.gradle.api.tasks.PathSensitivity;
import org.gradle.api.tasks.SkipWhenEmpty;
import org.gradle.api.tasks.SourceTask;
import org.gradle.api.tasks.TaskAction;
import org.gradle.internal.file.Deleter;
import org.gradle.process.internal.worker.WorkerProcessFactory;
import org.gradle.work.ChangeType;
import org.gradle.work.FileChange;

Class <org.gradle.api.tasks.JavaExec> extends/implements org.gradle.api.internal.ConventionTask that is Gradle Internal API in (JavaExec.java:0)
Class <org.gradle.api.tasks.SourceTask> extends/implements org.gradle.api.internal.ConventionTask that is Gradle Internal API in (SourceTask.java:0)

import org.gradle.api.tasks.Optional;
import org.gradle.api.tasks.OutputDirectory;
import org.gradle.api.tasks.PathSensitive;
import org.gradle.api.tasks.PathSensitivity;
import org.gradle.api.tasks.SourceTask;
import org.gradle.api.tasks.TaskAction;
import org.gradle.api.tasks.javadoc.internal.JavadocExecutableUtils;
import org.gradle.api.tasks.javadoc.internal.JavadocSpec;

import org.gradle.api.tasks.Optional;
import org.gradle.api.tasks.OutputDirectory;
import org.gradle.api.tasks.PathSensitive;
import org.gradle.api.tasks.PathSensitivity;
import org.gradle.api.tasks.SourceTask;
import org.gradle.api.tasks.TaskAction;
import org.gradle.internal.file.Deleter;

import javax.annotation.Nullable;
import javax.inject.Inject;
import java.io.File;
import java.io.IOException;

            const val ALL_WARNINGS_AS_ERRORS = "allWarningsAsErrors"
            const val SKIP_METADATA_VERSION_CHECK = "skipMetadataVersionCheck"
            const val TEMPLATE_ID = "templateId"
            const val SOURCE_HASH = "sourceHash"
            const val COMPILATION_CLASS_PATH = "compilationClassPath"
            const val ACCESSORS_CLASS_PATH = "accessorsClassPath"

                            // Should run after edges only exist between tasks, so this cast is safe
                            TaskNode sourceTask = (TaskNode) toBeRemoved.from;
                            TaskNode targetTask = (TaskNode) toBeRemoved.to;
                            sourceTask.removeShouldSuccessor(targetTask);
                            restorePath(path, toBeRemoved);
                            restoreQueue(toBeRemoved);

.buildSrc/src/main/java/CreateMD5.java
[source,java]
----
include::{snippetsPath}/workerApi/md5CustomTask/groovy/buildSrc/src/main/java/CreateMD5.java[]
----
<1> link:{javadocPath}/org/gradle/api/tasks/SourceTask.html[SourceTask] is a convenience type for tasks that operate on a set of source files.
<2> The task output will go into a configured directory.

==== SourceTask is no longer sensitive to empty directories

Previously, empty directories would be taken into account during up-to-date checks and build cache key calculations for the sources declared in `SourceTask`.