Java 类com.amazonaws.services.dynamodbv2.model.StreamSpecification 实例源码

private String enableStreamForTable(AmazonDynamoDBClient client, StreamViewType viewType, String tableName) {
    DescribeTableRequest describeTableRequest = new DescribeTableRequest()
        .withTableName(tableName);
    DescribeTableResult describeResult = client.describeTable(describeTableRequest);
    if (describeResult.getTable().getStreamSpecification().isStreamEnabled()) {
        //TODO: what if the viewtype doesn't match
        return describeResult.getTable().getLatestStreamId();
    }

    StreamSpecification streamSpecification = new StreamSpecification();
    streamSpecification.setStreamEnabled(true);
    streamSpecification.setStreamViewType(viewType);
    UpdateTableRequest updateTableRequest = new UpdateTableRequest()
        .withTableName(tableName)
        .withStreamSpecification(streamSpecification);

    UpdateTableResult result = client.updateTable(updateTableRequest);
    return result.getTableDescription().getLatestStreamId();
}

public static String enableStreamForTable(AmazonDynamoDBClient client, StreamViewType viewType, String tableName) {
    DescribeTableRequest describeTableRequest = new DescribeTableRequest()
        .withTableName(tableName);
    DescribeTableResult describeResult = client.describeTable(describeTableRequest);
    if (describeResult.getTable().getStreamSpecification().isStreamEnabled()) {
        //TODO: what if the viewtype doesn't match
        return describeResult.getTable().getLatestStreamId();
    }

    StreamSpecification streamSpecification = new StreamSpecification();
    streamSpecification.setStreamEnabled(true);
    streamSpecification.setStreamViewType(viewType);
    UpdateTableRequest updateTableRequest = new UpdateTableRequest()
        .withTableName(tableName)
        .withStreamSpecification(streamSpecification);

    UpdateTableResult result = client.updateTable(updateTableRequest);
    return result.getTableDescription().getLatestStreamId();
}

public static String createTable(AmazonDynamoDBClient client, String tableName) {
    java.util.List<AttributeDefinition> attributeDefinitions = new ArrayList<AttributeDefinition>();
    attributeDefinitions.add(new AttributeDefinition().withAttributeName("Id").withAttributeType("N"));

    java.util.List<KeySchemaElement> keySchema = new ArrayList<KeySchemaElement>();
    keySchema.add(new KeySchemaElement().withAttributeName("Id").withKeyType(KeyType.HASH));

    ProvisionedThroughput provisionedThroughput = new ProvisionedThroughput()
        .withReadCapacityUnits(2L).withWriteCapacityUnits(2L);

    StreamSpecification streamSpecification = new StreamSpecification();
    streamSpecification.setStreamEnabled(true);
    streamSpecification.setStreamViewType(StreamViewType.NEW_IMAGE);
    CreateTableRequest createTableRequest = new CreateTableRequest()
        .withTableName(tableName)
        .withAttributeDefinitions(attributeDefinitions)
        .withKeySchema(keySchema)
        .withProvisionedThroughput(provisionedThroughput)
        .withStreamSpecification(streamSpecification);

    try {
        System.out.println("Creating table " + tableName);
        CreateTableResult result = client.createTable(createTableRequest);
        return result.getTableDescription().getLatestStreamId();
    } catch(ResourceInUseException e) {
        System.out.println("Table already exists.");
        return describeTable(client, tableName).getTable().getLatestStreamId();
    }
}

public static void main(String[] args) {
    dynamodb.createTable(new CreateTableRequest()
            .withTableName(SCORE_TABLE_NAME)
            .withKeySchema(new KeySchemaElement(SCORE_ID, KeyType.HASH))
            .withAttributeDefinitions(new AttributeDefinition(SCORE_ID, ScalarAttributeType.S))
            .withProvisionedThroughput(new ProvisionedThroughput(20L, 20L))
            .withStreamSpecification(new StreamSpecification()
                    .withStreamEnabled(true)
                    .withStreamViewType(StreamViewType.NEW_IMAGE))
            );
}

/**
 * @return StreamArn
 */
public static String createTable(AmazonDynamoDBClient client, String tableName) {
    java.util.List<AttributeDefinition> attributeDefinitions = new ArrayList<AttributeDefinition>();
    attributeDefinitions.add(new AttributeDefinition().withAttributeName("Id").withAttributeType("N"));

    java.util.List<KeySchemaElement> keySchema = new ArrayList<KeySchemaElement>();
    keySchema.add(new KeySchemaElement().withAttributeName("Id").withKeyType(KeyType.HASH));

    ProvisionedThroughput provisionedThroughput = new ProvisionedThroughput()
        .withReadCapacityUnits(2L).withWriteCapacityUnits(2L);

    StreamSpecification streamSpecification = new StreamSpecification();
    streamSpecification.setStreamEnabled(true);
    streamSpecification.setStreamViewType(StreamViewType.NEW_IMAGE);
    CreateTableRequest createTableRequest = new CreateTableRequest()
        .withTableName(tableName)
        .withAttributeDefinitions(attributeDefinitions)
        .withKeySchema(keySchema)
        .withProvisionedThroughput(provisionedThroughput)
        .withStreamSpecification(streamSpecification);

    try {
        System.out.println("Creating table " + tableName);
        CreateTableResult result = client.createTable(createTableRequest);
        return result.getTableDescription().getLatestStreamArn();
    } catch(ResourceInUseException e) {
        System.out.println("Table already exists.");
        return describeTable(client, tableName).getTable().getLatestStreamArn();
    }
}

public static TableDescription createTable(AmazonDynamoDB client, String tableName) throws InterruptedException {
    CreateTableRequest tableReq = new CreateTableRequest().withTableName(tableName)
            .withKeySchema(new KeySchemaElement("Id", KeyType.HASH))
            .withAttributeDefinitions(new AttributeDefinition("Id", ScalarAttributeType.N))
            .withProvisionedThroughput(new ProvisionedThroughput(10L, 10L))
            .withStreamSpecification(new StreamSpecification().withStreamEnabled(true).withStreamViewType(StreamViewType.NEW_AND_OLD_IMAGES));

    DynamoDB dynamoDB = new DynamoDB(client);
    Table table = dynamoDB.createTable(tableReq);
    return table.waitForActive();
}