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# Fontes de dados personalizadas (Java)
<a name="custom-java-sample"></a>

O código a seguir fornece um exemplo de implementação de uma fonte de dados personalizada usando Java. Primeiro, o programa cria uma fonte de dados personalizada e depois sincroniza os documentos recém-adicionados ao índice com a fonte de dados personalizada.

O código a seguir demonstra a criação e o uso de uma fonte de dados personalizada. Ao usar uma fonte de dados personalizada no aplicativo, não é necessário criar uma nova fonte de dados (processo único) toda vez que o índice é sincronizado com a fonte de dados. Você usa o ID do índice e o ID da fonte de dados para sincronizar os dados.

```
package com.amazonaws.kendra;

import java.util.concurrent.TimeUnit;
import software.amazon.awssdk.services.kendra.KendraClient;
import csoftware.amazon.awssdk.services.kendra.model.BatchPutDocumentRequest;
import csoftware.amazon.awssdk.services.kendra.model.BatchPutDocumentResponse;
import software.amazon.awssdk.services.kendra.model.CreateDataSourceRequest;
import software.amazon.awssdk.services.kendra.model.CreateDataSourceResponse;
import software.amazon.awssdk.services.kendra.model.DataSourceType;
import software.amazon.awssdk.services.kendra.model.Document;
import software.amazon.awssdk.services.kendra.model.ListDataSourceSyncJobsRequest;
import software.amazon.awssdk.services.kendra.model.ListDataSourceSyncJobsResponse;
import software.amazon.awssdk.services.kendra.model.StartDataSourceSyncJobRequest;
import software.amazon.awssdk.services.kendra.model.StartDataSourceSyncJobResponse;
import software.amazon.awssdk.services.kendra.model.StopDataSourceSyncJobRequest;
import software.amazon.awssdk.services.kendra.model.StopDataSourceSyncJobResponse;

public class SampleSyncForCustomDataSource {
  public static void main(String[] args) {
    KendraClient kendra = KendraClient.builder().build();

    String myIndexId = "yourIndexId";
    String dataSourceName = "custom data source";
    String dataSourceDescription = "Amazon Kendra custom data source connector"
	
    // Create custom data source
    CreateDataSourceRequest createDataSourceRequest = CreateDataSourceRequest
        .builder()
        .indexId(myIndexId)
        .name(dataSourceName)
        .description(dataSourceDescription)
        .type(DataSourceType.CUSTOM)
        .build();
    	
    CreateDataSourceResponse createDataSourceResponse = kendra.createDataSource(createDataSourceRequest);
    System.out.println(String.format("Response of creating data source: %s", createDataSourceResponse));
	
    // Get the data source ID from createDataSourceResponse
    String dataSourceId = createDataSourceResponse.Id();

    // Wait for the custom data source to become active
    System.out.println(String.format("Waiting for Amazon Kendra to create the data source %s", dataSourceId));
    // You can use the DescribeDataSource API to check the status
    DescribeDataSourceRequest describeDataSourceRequest = DescribeDataSourceRequest
        .builder()
        .indexId(myIndexId)
        .id(dataSourceId)
        .build();

    while (true) {
        DescribeDataSourceResponse describeDataSourceResponse = kendra.describeDataSource(describeDataSourceRequest);

        DataSourceStatus status = describeDataSourceResponse.status();
        System.out.println(String.format("Creating data source. Status: %s", status));
        if (status != DataSourceStatus.CREATING) {
            break;
        }
        
        TimeUnit.SECONDS.sleep(60);
    }
    
    // Start syncing yor data source by calling StartDataSourceSyncJob and providing your index ID 
    // and your custom data source ID
    System.out.println(String.format("Synchronize the data source %s", dataSourceId));
    StartDataSourceSyncJobRequest startDataSourceSyncJobRequest = StartDataSourceSyncJobRequest
        .builder()
        .indexId(myIndexId)
        .id(dataSourceId)
        .build();
    StartDataSourceSyncJobResponse startDataSourceSyncJobResponse = kendra.startDataSourceSyncJob(startDataSourceSyncJobRequest);
    
    // Get the  sync job execution ID from startDataSourceSyncJobResponse
    String executionId = startDataSourceSyncJobResponse.ExecutionId();
	System.out.println(String.format("Waiting for the data source to sync with the index %s for execution ID %s", indexId, startDataSourceSyncJobResponse.executionId()));
    
    // Add 2 documents uploaded to S3 bucket to your index using the BatchPutDocument API
    // The added documents should sync with your custom data source
    Document pollyDoc = Document
        .builder()
        .s3Path(
            S3Path.builder()
            .bucket("amzn-s3-demo-bucket")
            .key("what_is_Amazon_Polly.docx")
            .build())
        .title("What is Amazon Polly?")
        .id("polly_doc_1")
        .build();
    
    Document rekognitionDoc = Document
        .builder()
        .s3Path(
            S3Path.builder()
            .bucket("amzn-s3-demo-bucket")
            .key("what_is_amazon_rekognition.docx")
            .build())
        .title("What is Amazon rekognition?")
        .id("rekognition_doc_1")
        .build();
    
    BatchPutDocumentRequest batchPutDocumentRequest = BatchPutDocumentRequest
        .builder()
        .indexId(myIndexId)
        .documents(pollyDoc, rekognitionDoc)
        .build();
    
    BatchPutDocumentResponse result = kendra.batchPutDocument(batchPutDocumentRequest);
    System.out.println(String.format("BatchPutDocument result: %s", result));
    
    // Once custom data source synced, stop the sync job using the StopDataSourceSyncJob API
    StopDataSourceSyncJobResponse stopDataSourceSyncJobResponse = kendra.stopDataSourceSyncJob(
        StopDataSourceSyncJobRequest()
            .indexId(myIndexId)
            .id(dataSourceId)
    );
	
	// List your sync jobs
    ListDataSourceSyncJobsRequest listDataSourceSyncJobsRequest = ListDataSourceSyncJobsRequest
        .builder()
        .indexId(myIndexId)
        .id(dataSourceId)
        .build();
    
    while (true) {
        ListDataSourceSyncJobsResponse listDataSourceSyncJobsResponse = kendra.listDataSourceSyncJobs(listDataSourceSyncJobsRequest);
        DataSourceSyncJob job = listDataSourceSyncJobsResponse.history().get(0);
        System.out.println(String.format("Status: %s", job.status()));
    }
  }
}
```