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;
  }

                    }
                }
            }

            task sourceTask(type: Producer) {
                sources = file("sources")
                outputDir = file("build/output")
            }

            task consumer(type: Consumer) {
                inputDirectory = sourceTask.outputDir
                outputFile = file("build/consumer.txt")
            }
        """

import org.gradle.api.provider.Property;
import org.gradle.api.tasks.Input;
import org.gradle.api.tasks.Internal;
import org.gradle.api.tasks.Nested;
import org.gradle.api.tasks.Optional;
import org.gradle.api.tasks.SourceTask;
import org.gradle.api.tasks.VerificationTask;
import org.gradle.jvm.toolchain.JavaLauncher;
import org.gradle.jvm.toolchain.JavaToolchainService;
import org.gradle.jvm.toolchain.internal.CurrentJvmToolchainSpec;

import org.gradle.api.model.ReplacedBy;
import org.gradle.api.provider.Provider;
import org.gradle.api.tasks.Classpath;
import org.gradle.api.tasks.Input;
import org.gradle.api.tasks.OutputDirectory;
import org.gradle.api.tasks.SourceTask;
import org.gradle.internal.deprecation.DeprecationLogger;
import org.gradle.internal.instrumentation.api.annotations.ReplacedAccessor;
import org.gradle.internal.instrumentation.api.annotations.ReplacedDeprecation;

import org.gradle.api.plugins.quality.Checkstyle
import org.gradle.api.plugins.quality.CodeNarc
import org.gradle.api.plugins.quality.Pmd
import org.gradle.api.tasks.Copy
import org.gradle.api.tasks.SourceTask
import org.gradle.api.tasks.Sync
import org.gradle.api.tasks.bundling.Tar
import org.gradle.api.tasks.bundling.War
import org.gradle.api.tasks.bundling.Zip
import org.gradle.api.tasks.compile.GroovyCompile

Method <org.gradle.api.tasks.SourceTask.getSource()> does not have raw return type assignable to org.gradle.api.file.ConfigurableFileCollection in (SourceTask.java:0)
Method <org.gradle.api.tasks.Upload.getConfiguration()> does not have raw return type assignable to org.gradle.api.file.ConfigurableFileCollection in (Upload.java:0)

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)

            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"

            fileCollection is FilteredFileTree -> {
                when {
                    // Optimize a common case, where fileCollection.asFileTree.matching(emptyPatterns) is used,
                    // e.g. in SourceTask and in CopySpec.
                    // Skip applying the filters to the tree
                    fileCollection.patterns.isEmpty -> {
                        fileCollection.tree.visitStructure(this)
                    }

.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.