graphql.kickstart.execution.instrumentation.FieldLevelTrackingApproach Maven / Gradle / Ivy

Go to download
package graphql.kickstart.execution.instrumentation;

import graphql.Internal;
import graphql.execution.ExecutionId;
import graphql.execution.instrumentation.InstrumentationState;
import org.dataloader.DataLoaderRegistry;

/**
 * This approach uses field level tracking to achieve its aims of making the data loader more
 * efficient. Can handle new/concurrent executions using the same sets of dataloaders, attempting to
 * batch load calls together.
 */
@Internal
public class FieldLevelTrackingApproach extends AbstractTrackingApproach {

  public FieldLevelTrackingApproach(DataLoaderRegistry dataLoaderRegistry) {
    super(dataLoaderRegistry);
  }

  public InstrumentationState createState(ExecutionId executionId) {
    synchronized (getStack()) {
      if (getStack().contains(executionId)) {
        throw new TrackingApproachException(
            String.format("Execution id %s already in active execution", executionId));
      }
      getStack().addExecution(executionId);
      return null;
    }
  }
}