Apache Flink Runtime

// Job graph construction
import org.apache.flink.runtime.jobgraph.JobGraph;
import org.apache.flink.runtime.jobgraph.JobVertex;
import org.apache.flink.runtime.jobgraph.JobVertexID;

// Execution graph and scheduling
import org.apache.flink.runtime.executiongraph.ExecutionGraph;
import org.apache.flink.runtime.scheduler.SchedulerNG;
import org.apache.flink.runtime.scheduler.DefaultScheduler;

// State management and checkpointing
import org.apache.flink.runtime.checkpoint.CheckpointCoordinator;
import org.apache.flink.runtime.state.KeyedStateBackend;
import org.apache.flink.runtime.state.OperatorStateBackend;

// Task execution
import org.apache.flink.runtime.taskexecutor.TaskExecutor;
import org.apache.flink.runtime.taskexecutor.TaskExecutorGateway;

// Resource management
import org.apache.flink.runtime.resourcemanager.ResourceManager;
import org.apache.flink.runtime.resourcemanager.ResourceManagerGateway;

// Testing and development
import org.apache.flink.runtime.minicluster.MiniCluster;
import org.apache.flink.runtime.minicluster.MiniClusterConfiguration;

// Job management and monitoring
import org.apache.flink.runtime.dispatcher.DispatcherGateway;
import org.apache.flink.runtime.executiongraph.AccessExecutionGraph;

// Create a simple job graph
JobGraph jobGraph = new JobGraph("MyFlinkJob");

// Create and configure a job vertex
JobVertex sourceVertex = new JobVertex("Source");
sourceVertex.setParallelism(4);
sourceVertex.setInvokableClass(MySourceTask.class);

JobVertex mapVertex = new JobVertex("Map");
mapVertex.setParallelism(4);
mapVertex.setInvokableClass(MyMapTask.class);

// Connect vertices
mapVertex.connectNewDataSetAsInput(
    sourceVertex, 
    DistributionPattern.ALL_TO_ALL,
    ResultPartitionType.PIPELINED
);

// Add vertices to job graph
jobGraph.addVertex(sourceVertex);
jobGraph.addVertex(mapVertex);

// Configure checkpointing
JobCheckpointingSettings checkpointingSettings = new JobCheckpointingSettings(
    Arrays.asList(sourceVertex.getID(), mapVertex.getID()),
    Arrays.asList(sourceVertex.getID(), mapVertex.getID()),
    Arrays.asList(sourceVertex.getID(), mapVertex.getID()),
    new CheckpointCoordinatorConfiguration.Builder()
        .setCheckpointInterval(5000L)
        .setCheckpointTimeout(60000L)
        .build(),
    null
);
jobGraph.setSnapshotSettings(checkpointingSettings);

// For testing - execute job in local MiniCluster
MiniClusterConfiguration config = new MiniClusterConfiguration.Builder()
    .setNumTaskManagers(1)
    .setNumSlotsPerTaskManager(4)
    .build();

MiniCluster miniCluster = new MiniCluster(config);
try {
    miniCluster.start();
    CompletableFuture<JobSubmissionResult> submission = miniCluster.submitJob(jobGraph);
    JobSubmissionResult result = submission.get();
    System.out.println("Job submitted with ID: " + result.getJobID());
    
    // Wait for job completion or trigger savepoint
    CompletableFuture<JobResult> jobResult = miniCluster.requestJobResult(result.getJobID());
    JobResult finalResult = jobResult.get();
    System.out.println("Job finished with status: " + finalResult.getJobExecutionResult());
} finally {
    miniCluster.closeAsync().get();
}

public class JobGraph implements ExecutionPlan {
    public JobGraph(String jobName);
    public JobGraph(JobID jobId, String jobName);
    public void addVertex(JobVertex vertex);
    public Iterable<JobVertex> getVertices();
    public JobID getJobID();
    public String getName();
    public void setJobType(JobType jobType);
    public JobType getJobType();
    public JobVertex findVertexByID(JobVertexID id);
    public void setJobConfiguration(Configuration jobConfiguration);
    public Configuration getJobConfiguration();
    public void setSnapshotSettings(JobCheckpointingSettings settings);
    public JobCheckpointingSettings getCheckpointingSettings();
}

public class JobVertex implements Serializable {
    public JobVertex(String name);
    public JobVertex(String name, JobVertexID id);
    public JobVertexID getId();
    public String getName();
    public void setParallelism(int parallelism);
    public int getParallelism();
    public void setInvokableClass(Class<? extends TaskInvokable> invokable);
    public void connectNewDataSetAsInput(
        JobVertex input, 
        DistributionPattern distPattern, 
        ResultPartitionType partitionType
    );
}

public interface SchedulerNG extends GlobalFailureHandler, AutoCloseableAsync {
    void startScheduling();
    void cancel();
    CompletableFuture<JobStatus> getJobTerminationFuture();
    boolean updateTaskExecutionState(TaskExecutionStateTransition taskExecutionState);
    CompletableFuture<CompletedCheckpoint> triggerCheckpoint(CheckpointType checkpointType);
    CompletableFuture<String> stopWithSavepoint(
        String targetDirectory, 
        boolean terminate,
        SavepointFormatType formatType
    );
}

public interface ExecutionGraph {
    String getJobName();
    JobID getJobID();
    JobStatus getState();
    ExecutionJobVertex getJobVertex(JobVertexID id);
    Iterable<ExecutionJobVertex> getAllVertices();
    CheckpointCoordinator getCheckpointCoordinator();
}

public class CheckpointCoordinator {
    public CompletableFuture<CompletedCheckpoint> triggerCheckpoint(boolean isPeriodic);
    public CompletableFuture<CompletedCheckpoint> triggerCheckpoint(CheckpointType checkpointType);
    public CompletableFuture<CompletedCheckpoint> triggerSavepoint(
        @Nullable String targetLocation,
        SavepointFormatType formatType
    );
    public void shutdown() throws Exception;
    public CompletedCheckpointStore getCheckpointStore();
}

public interface KeyedStateBackend<K> extends KeyedState {
    <T> InternalKvState<K, ?, T> createState(
        StateDescriptor<?, T> stateDescriptor,
        TypeSerializer<T> namespaceSerializer
    );
    RunnableFuture<SnapshotResult<KeyedStateHandle>> snapshot(
        long checkpointId,
        long timestamp,
        CheckpointStreamFactory streamFactory,
        CheckpointOptions checkpointOptions
    );
}

public interface OperatorStateBackend {
    <S> ListState<S> getListState(ListStateDescriptor<S> stateDescriptor);
    <K, V> BroadcastState<K, V> getBroadcastState(MapStateDescriptor<K, V> stateDescriptor);
    RunnableFuture<SnapshotResult<OperatorStateHandle>> snapshot(
        long checkpointId,
        long timestamp,
        CheckpointStreamFactory factory,
        CheckpointOptions checkpointOptions
    );
}

public interface TaskExecutorGateway extends RpcGateway {
    CompletableFuture<Acknowledge> requestSlot(
        SlotID slotId,
        JobID jobId,
        AllocationID allocationId,
        ResourceProfile resourceProfile,
        String targetAddress,
        ResourceManagerId resourceManagerId,
        Duration timeout
    );
    
    CompletableFuture<Acknowledge> submitTask(
        TaskDeploymentDescriptor tdd,
        JobMasterId jobMasterId,
        Duration timeout
    );
    
    CompletableFuture<Acknowledge> cancelTask(
        ExecutionAttemptID executionAttemptID,
        Duration timeout
    );
    
    CompletableFuture<Acknowledge> triggerCheckpoint(
        ExecutionAttemptID executionAttemptID,
        long checkpointId,
        long checkpointTimestamp,
        CheckpointOptions checkpointOptions,
        Duration timeout
    );
}

public interface ResourceManagerGateway extends FencedRpcGateway<ResourceManagerId> {
    CompletableFuture<RegistrationResponse> registerJobMaster(
        JobMasterId jobMasterId,
        ResourceID jobMasterResourceId,
        String jobMasterAddress,
        JobID jobId,
        Duration timeout
    );
    
    CompletableFuture<RegistrationResponse> registerTaskExecutor(
        String taskExecutorAddress,
        ResourceID resourceId,
        SlotReport slotReport,
        ResourceProfile totalResourceProfile,
        Duration timeout
    );
    
    CompletableFuture<Acknowledge> requestSlot(
        JobMasterId jobMasterId,
        SlotRequest slotRequest,
        Duration timeout
    );
}

public class WorkerResourceSpec {
    public static WorkerResourceSpec fromTotalResourceProfile(
        ResourceProfile totalResourceProfile,
        MemorySize networkMemorySize
    );
    
    public ResourceProfile getTotalResourceProfile();
    public MemorySize getTaskHeapSize();
    public MemorySize getTaskOffHeapSize();
    public MemorySize getNetworkMemSize();
    public MemorySize getManagedMemSize();
}

public interface HighAvailabilityServices extends AutoCloseableAsync {
    LeaderElectionService getResourceManagerLeaderElectionService();
    LeaderElectionService getDispatcherLeaderElectionService();
    LeaderElectionService getJobManagerLeaderElectionService(JobID jobID);
    LeaderRetrievalService getResourceManagerLeaderRetriever();
    LeaderRetrievalService getDispatcherLeaderRetriever();
    CheckpointRecoveryFactory getCheckpointRecoveryFactory();
}

public interface LeaderElectionService {
    void start(LeaderContender contender);
    void stop();
    void confirmLeadership(UUID leaderSessionID);
    boolean hasLeadership(UUID leaderSessionId);
}

public interface LeaderRetrievalService {
    void start(LeaderRetrievalListener listener);
    void stop();
}

public class MiniCluster implements AutoCloseableAsync {
    public MiniCluster(MiniClusterConfiguration configuration);
    
    public void start() throws Exception;
    public CompletableFuture<Void> closeAsync();
    
    public CompletableFuture<JobSubmissionResult> submitJob(JobGraph jobGraph);
    public CompletableFuture<JobResult> requestJobResult(JobID jobId);
    public CompletableFuture<Acknowledge> cancelJob(JobID jobId);
    
    public CompletableFuture<String> triggerSavepoint(
        JobID jobId,
        String targetDirectory,
        SavepointFormatType formatType
    );
    
    public ClusterClient<MiniClusterJobClient> getClusterClient();
    public String getRestAddress();
    public int getRestPort();
}

public class MiniClusterConfiguration {
    public static Builder newBuilder();
    
    public static class Builder {
        public Builder setNumTaskManagers(int numTaskManagers);
        public Builder setNumSlotsPerTaskManager(int numSlotsPerTaskManager);
        public Builder setConfiguration(Configuration configuration);
        public Builder setRpcServiceSharing(RpcServiceSharing rpcServiceSharing);
        public MiniClusterConfiguration build();
    }
}

public interface DispatcherGateway extends FencedRpcGateway<DispatcherId> {
    CompletableFuture<Acknowledge> submitJob(JobGraph jobGraph, Duration timeout);
    
    CompletableFuture<Collection<JobStatusMessage>> listJobs(Duration timeout);
    
    CompletableFuture<ArchivedExecutionGraph> requestJob(JobID jobId, Duration timeout);
    
    CompletableFuture<Acknowledge> cancelJob(JobID jobId, Duration timeout);
    
    CompletableFuture<String> triggerSavepoint(
        JobID jobId,
        String targetDirectory,
        SavepointFormatType formatType,
        Duration timeout
    );
    
    CompletableFuture<String> stopWithSavepoint(
        JobID jobId,
        String targetDirectory,
        SavepointFormatType formatType,
        Duration timeout
    );
    
    CompletableFuture<Acknowledge> disposeSavepoint(String savepointPath, Duration timeout);
    
    CompletableFuture<Integer> getBlobServerPort(Duration timeout);
}

public interface AccessExecutionGraph {
    String getJobName();
    JobID getJobID();
    JobStatus getState();
    JobType getJobType();
    
    long getStatusTimestamp(JobStatus status);
    Throwable getFailureCause();
    String getFailureCauseAsString();
    
    Iterable<AccessExecutionJobVertex> getAllVertices();
    AccessExecutionJobVertex getJobVertex(JobVertexID vertexId);
    
    Map<JobVertexID, AccessExecutionJobVertex> getAllVerticesAsMap();
    
    long getCheckpointCoordinatorCheckpointId();
    CheckpointStatsSnapshot getCheckpointStatsSnapshot();
    
    Configuration getJobConfiguration();
    SerializedValue<ExecutionConfig> getSerializedExecutionConfig();
    
    boolean isStoppable();
    ArchivedExecutionGraph archive();
}

// Core identifiers
public class JobID implements Serializable {
    public static JobID generate();
    public static JobID fromHexString(String hexString);
}

public class JobVertexID implements Serializable {
    public JobVertexID();
    public JobVertexID(byte[] bytes);
}

public class ExecutionAttemptID implements Serializable {
    public ExecutionAttemptID();
    public ExecutionAttemptID(ExecutionVertexID vertexId, int attemptNumber);
}

// Resource specifications
public class ResourceProfile implements Serializable {
    public static final ResourceProfile ZERO;
    public static final ResourceProfile ANY;
    
    public static ResourceProfile fromResources(
        double cpuCores,
        MemorySize taskHeapMemory,
        MemorySize taskOffHeapMemory,
        MemorySize managedMemory,
        MemorySize networkMemory
    );
    
    public CPUResource getCpuCores();
    public MemorySize getTaskHeapMemory();
    public MemorySize getTaskOffHeapMemory();
}

// Job configuration
public enum JobType {
    BATCH, STREAMING
}

public enum DistributionPattern {
    POINTWISE, ALL_TO_ALL
}

// Checkpoint types
public enum CheckpointType implements SnapshotType {
    CHECKPOINT("Checkpoint"),
    SAVEPOINT("Savepoint");
}

// Job execution results
public class JobSubmissionResult {
    public JobID getJobID();
    public boolean isJobSubmitted();
}

public class JobResult {
    public JobID getJobID();
    public ApplicationStatus getApplicationStatus();
    public JobExecutionResult getJobExecutionResult();
    public long getNetRuntime();
    public Map<String, SerializedValue<Object>> getAccumulatorResults();
}

public enum JobStatus {
    INITIALIZING, CREATED, RUNNING, FAILING, FAILED, 
    CANCELLING, CANCELED, FINISHED, RESTARTING, SUSPENDED
}

// Mini cluster types
public enum RpcServiceSharing {
    SHARED, DEDICATED
}

// Savepoint format types
public enum SavepointFormatType {
    CANONICAL, NATIVE
}