software.amazon.awssdk.services.dynamodb.model.ListTablesRequest Java Examples

public static void main(String[] args) throws InterruptedException {
    // Creates a default async client with credentials and regions loaded from the environment
    DynamoDbAsyncClient client = DynamoDbAsyncClient.create();
    CompletableFuture<ListTablesResponse> response = client.listTables(ListTablesRequest.builder()
                                                                                        .build());

    // Map the response to another CompletableFuture containing just the table names
    CompletableFuture<List<String>> tableNames = response.thenApply(ListTablesResponse::tableNames);
    // When future is complete (either successfully or in error) handle the response
    tableNames.whenComplete((tables, err) -> {
        try {
        	if (tables != null) {
                tables.forEach(System.out::println);
            } else {
                // Handle error
                err.printStackTrace();
            }
        } finally {
            // Lets the application shut down. Only close the client when you are completely done with it.
            client.close();
        }
    });

    tableNames.join();
}
 

private static void useThirdPartySubscriber() {
    // snippet-start:[dynamodb.java2.async_pagination.async]
    System.out.println("running AutoPagination - using third party subscriber...\n");

    DynamoDbAsyncClient asyncClient = DynamoDbAsyncClient.create();
    ListTablesPublisher publisher = asyncClient.listTablesPaginator(ListTablesRequest.builder()
                                                                                     .build());

    // The Flowable class has many helper methods that work with any reactive streams compatible publisher implementation
    List<String> tables = Flowable.fromPublisher(publisher)
                                  .flatMapIterable(ListTablesResponse::tableNames)
                                  .toList()
                                  .blockingGet();
    System.out.println(tables);
    
    // snippet-end:[dynamodb.java2.async_pagination.async]
}
 

public static void manualPagination(DynamoDbClient client) {
    System.out.println("running ManualPagination...\n");

    ListTablesRequest listTablesRequest = ListTablesRequest.builder().limit(3).build();
    boolean done = false;
    while (!done) {
        ListTablesResponse listTablesResponse = client.listTables(listTablesRequest);
        System.out.println(listTablesResponse.tableNames());

        if (listTablesResponse.lastEvaluatedTableName() == null) {
            done = true;
        }

        listTablesRequest = listTablesRequest.toBuilder()
                .exclusiveStartTableName(listTablesResponse.lastEvaluatedTableName())
                .build();
    }
}
 

public static void autoPaginationWithResume(DynamoDbClient client) {

        System.out.println("running AutoPagination with resume in case of errors...\n");
        ListTablesRequest listTablesRequest = ListTablesRequest.builder().limit(3).build();
        ListTablesIterable responses = client.listTablesPaginator(listTablesRequest);

        ListTablesResponse lastSuccessfulPage = null;
        try {
            for (ListTablesResponse response : responses) {
                response.tableNames().forEach(System.out::println);
                lastSuccessfulPage = response;
            }
        } catch (DynamoDbException exception) {
            if (lastSuccessfulPage != null) {
                System.out.println(exception.getMessage());
            }
        }
    }
 

/**
 * Basic smoke test that the SDK works with a security manager when given appropriate
 * permissions
 */
@Test
public void securityManagerEnabled() {
    System.setProperty(JAVA_SECURITY_POLICY_PROPERTY, getPolicyUrl());
    SecurityManager securityManager = new SecurityManager();
    System.setSecurityManager(securityManager);
    DynamoDbClient ddb = DynamoDbClient.builder().credentialsProvider(CREDENTIALS_PROVIDER_CHAIN).build();
    assertNotNull(ddb.listTables(ListTablesRequest.builder().build()));
}
 

/**
 * Quick utility method to delete all tables when we have too much capacity
 * reserved for the region.
 */
public static void deleteAllTables() {
    ListTablesResponse listTables = dynamo.listTables(ListTablesRequest.builder().build());
    for (String name : listTables.tableNames()) {
        dynamo.deleteTable(DeleteTableRequest.builder().tableName(name).build());
    }
}
 

private void callApi(DynamoDbClient client) {
    try {
        client.listTables(ListTablesRequest.builder().build());
    } catch (SdkException expected) {
        // Ignored or expected.
    }
}
 

private static void useThirdPartySubscriber_Reactor() {
    System.out.println("running AutoPagination - using third party subscriber...\n");

    DynamoDbAsyncClient asyncClient = DynamoDbAsyncClient.create();
    ListTablesPublisher publisher = asyncClient.listTablesPaginator(ListTablesRequest.builder()
                                                                                     .build());

    // The Flux class has many helper methods that work with any reactive streams compatible publisher implementation
    List<String> tables = Flux.from(publisher)
                              .flatMapIterable(ListTablesResponse::tableNames)
                              .collectList()
                              .block();
    System.out.println(tables);
}
 

@Test
public void testResponseDescriptors() throws Exception {
    String responseBody = "{\"LastEvaluatedTableName\":\"baz\",\"TableNames\":[\"foo\",\"bar\",\"baz\"]}";
    SdkHttpResponse mockResponse = SdkHttpResponse.builder()
            .statusCode(200)
            .putHeader("x-amzn-requestid", "1111-2222-3333-4444")
            .putHeader("Content-Length", "84")
            .putHeader("Content-Type", "application/x-amz-json-1.0")
            .build();
    SdkHttpClient mockClient = mockSdkHttpClient(mockResponse, responseBody);

    DynamoDbClient client = DynamoDbClient.builder()
            .httpClient(mockClient)
            .endpointOverride(URI.create("http://example.com"))
            .region(Region.of("us-west-42"))
            .credentialsProvider(StaticCredentialsProvider.create(
                    AwsSessionCredentials.create("key", "secret", "session")
            ))
            .overrideConfiguration(ClientOverrideConfiguration.builder()
                    .addExecutionInterceptor(new TracingInterceptor())
                    .build()
            )
            .build();

    Segment segment = AWSXRay.getCurrentSegment();
    client.listTables(ListTablesRequest.builder()
            .limit(3)
            .build()
    );

    Assert.assertEquals(1, segment.getSubsegments().size());
    Subsegment subsegment = segment.getSubsegments().get(0);
    Map<String, Object> awsStats = subsegment.getAws();
    @SuppressWarnings("unchecked")
    Map<String, Object> httpResponseStats = (Map<String, Object>) subsegment.getHttp().get("response");

    Assert.assertEquals("ListTables", awsStats.get("operation"));
    Assert.assertEquals(3, awsStats.get("limit"));
    Assert.assertEquals("1111-2222-3333-4444", awsStats.get("request_id"));
    Assert.assertEquals(3, awsStats.get("table_count"));
    Assert.assertEquals("us-west-42", awsStats.get("region"));
    Assert.assertEquals(0, awsStats.get("retries"));
    Assert.assertEquals(84L, httpResponseStats.get("content_length"));
    Assert.assertEquals(200, httpResponseStats.get("status"));
    Assert.assertEquals(false, subsegment.isInProgress());
}
 

@Test
public void responseMetadataInBaseResultIsSameAsMetadataCache() {
    ListTablesRequest request = ListTablesRequest.builder().build();
    ListTablesResponse result = dynamoDB.listTables(request);
    assertThat(result.sdkHttpResponse().headers()).isNotNull();
}
 

@Test
public void httpMetadataInBaseResultIsValid() {
    ListTablesResponse result = dynamoDB.listTables(ListTablesRequest.builder().build());
    assertThat(result.sdkHttpResponse().statusCode()).isEqualTo(200);
    assertThat(result.sdkHttpResponse().headers()).containsKey("x-amz-crc32");
}