Utilizza StreamManagerClient per lavorare con i flussi

client = StreamManagerClient()
 
try:
    client.create_message_stream(MessageStreamDefinition(
        name="StreamName",  # Required.
        max_size=268435456,  # Default is 256 MB.
        stream_segment_size=16777216,  # Default is 16 MB.
        time_to_live_millis=None,  # By default, no TTL is enabled.
        strategy_on_full=StrategyOnFull.OverwriteOldestData,  # Required.
        persistence=Persistence.File,  # Default is File.
        flush_on_write=False,  # Default is false.
        export_definition=ExportDefinition(  # Optional. Choose where/how the stream is exported to the Cloud AWS.
            kinesis=None,
            iot_analytics=None,
            iot_sitewise=None,
            s3_task_executor=None
        )
    ))
except StreamManagerException:
    pass
    # Properly handle errors.
except ConnectionError or asyncio.TimeoutError:
    pass
    # Properly handle errors.

Riferimento SDK Python:create_message_stream|MessageStreamDefinition

try (final StreamManagerClient client = GreengrassClientBuilder.streamManagerClient().build()) {
    client.createMessageStream(
            new MessageStreamDefinition()
                    .withName("StreamName") // Required.
                    .withMaxSize(268435456L)  // Default is 256 MB.
                    .withStreamSegmentSize(16777216L)  // Default is 16 MB.
                    .withTimeToLiveMillis(null)  // By default, no TTL is enabled.
                    .withStrategyOnFull(StrategyOnFull.OverwriteOldestData)  // Required.
                    .withPersistence(Persistence.File)  // Default is File.
                    .withFlushOnWrite(false)  // Default is false.
                    .withExportDefinition(  // Optional. Choose where/how the stream is exported to the Cloud AWS.
                            new ExportDefinition()
                                    .withKinesis(null)
                                    .withIotAnalytics(null)
                                    .withIotSitewise(null)
                                    .withS3TaskExecutor(null)
                    )
 
    );
} catch (StreamManagerException e) {
    // Properly handle exception.
}

Riferimento SDK Java:createMessageStream|MessageStreamDefinition

const client = new StreamManagerClient();
client.onConnected(async () => {
    try {
        await client.createMessageStream(
            new MessageStreamDefinition()
                .withName("StreamName") // Required.
                .withMaxSize(268435456)  // Default is 256 MB.
                .withStreamSegmentSize(16777216)  // Default is 16 MB.
                .withTimeToLiveMillis(null)  // By default, no TTL is enabled.
                .withStrategyOnFull(StrategyOnFull.OverwriteOldestData)  // Required.
                .withPersistence(Persistence.File)  // Default is File.
                .withFlushOnWrite(false)  // Default is false.
                .withExportDefinition(  // Optional. Choose where/how the stream is exported to the Cloud AWS.
                    new ExportDefinition()
                        .withKinesis(null)
                        .withIotAnalytics(null)
                        .withIotSitewise(null)
                        .withS3TaskExecutor(null)
                )
        );
    } catch (e) {
        // Properly handle errors.
    }
});
client.onError((err) => {
    // Properly handle connection errors.
    // This is called only when the connection to the StreamManager server fails.
});

Riferimento SDK Node.js:createMessageStream|MessageStreamDefinition

client = StreamManagerClient()
 
try:
    sequence_number = client.append_message(stream_name="StreamName", data=b'Arbitrary bytes data')
except StreamManagerException:
    pass
    # Properly handle errors.
except ConnectionError or asyncio.TimeoutError:
    pass
    # Properly handle errors.

Riferimento SDK Python:append_message

try (final StreamManagerClient client = GreengrassClientBuilder.streamManagerClient().build()) {
    long sequenceNumber = client.appendMessage("StreamName", "Arbitrary byte array".getBytes());
} catch (StreamManagerException e) {
    // Properly handle exception.
}

Riferimento SDK Java:appendMessage

const client = new StreamManagerClient();
client.onConnected(async () => {
    try {
        const sequenceNumber = await client.appendMessage("StreamName", Buffer.from("Arbitrary byte array"));
    } catch (e) {
        // Properly handle errors.
    }
});
client.onError((err) => {
    // Properly handle connection errors.
    // This is called only when the connection to the StreamManager server fails.
});

Riferimento SDK Node.js:appendMessage

client = StreamManagerClient()
 
try:
    # SiteWise requires unique timestamps in all messages. Add some randomness to time and offset.

    # Note: To create a new asset property data, you should use the classes defined in the
    # greengrasssdk.stream_manager module.

    time_in_nanos = TimeInNanos(
        time_in_seconds=calendar.timegm(time.gmtime()) - random.randint(0, 60), offset_in_nanos=random.randint(0, 10000)
    )
    variant = Variant(double_value=random.random())
    asset = [AssetPropertyValue(value=variant, quality=Quality.GOOD, timestamp=time_in_nanos)]
    putAssetPropertyValueEntry = PutAssetPropertyValueEntry(entry_id=str(uuid.uuid4()), property_alias="PropertyAlias", property_values=asset)
    sequence_number = client.append_message(stream_name="StreamName", data=Util.validate_and_serialize_to_json_bytes(putAssetPropertyValueEntry))
except StreamManagerException:
    pass
    # Properly handle errors.
except ConnectionError or asyncio.TimeoutError:
    pass
    # Properly handle errors.

Riferimento SDK Python:append_message|PutAssetPropertyValueEntry

try (final StreamManagerClient client = GreengrassClientBuilder.streamManagerClient().build()) {
    Random rand = new Random();
    // Note: To create a new asset property data, you should use the classes defined in the
    // com.amazonaws.greengrass.streammanager.model.sitewise package.
    List<AssetPropertyValue> entries = new ArrayList<>() ;

    // IoTSiteWise requires unique timestamps in all messages. Add some randomness to time and offset.
    final int maxTimeRandomness = 60;
    final int maxOffsetRandomness = 10000;
    double randomValue = rand.nextDouble();
    TimeInNanos timestamp = new TimeInNanos()
            .withTimeInSeconds(Instant.now().getEpochSecond() - rand.nextInt(maxTimeRandomness))
            .withOffsetInNanos((long) (rand.nextInt(maxOffsetRandomness)));
    AssetPropertyValue entry = new AssetPropertyValue()
            .withValue(new Variant().withDoubleValue(randomValue))
            .withQuality(Quality.GOOD)
            .withTimestamp(timestamp);
    entries.add(entry);

    PutAssetPropertyValueEntry putAssetPropertyValueEntry = new PutAssetPropertyValueEntry()
            .withEntryId(UUID.randomUUID().toString())
            .withPropertyAlias("PropertyAlias")
            .withPropertyValues(entries);
    long sequenceNumber = client.appendMessage("StreamName", ValidateAndSerialize.validateAndSerializeToJsonBytes(putAssetPropertyValueEntry));
} catch (StreamManagerException e) {
    // Properly handle exception.
}

Riferimento SDK Java:appendMessage|PutAssetPropertyValueEntry

const client = new StreamManagerClient();
client.onConnected(async () => {
    try {
        const maxTimeRandomness = 60;
        const maxOffsetRandomness = 10000;
        const randomValue = Math.random();
        // Note: To create a new asset property data, you should use the classes defined in the
        // aws-greengrass-core-sdk StreamManager module.
        const timestamp = new TimeInNanos()
            .withTimeInSeconds(Math.round(Date.now() / 1000) - Math.floor(Math.random() - maxTimeRandomness))
            .withOffsetInNanos(Math.floor(Math.random() * maxOffsetRandomness));
        const entry = new AssetPropertyValue()
            .withValue(new Variant().withDoubleValue(randomValue))
            .withQuality(Quality.GOOD)
            .withTimestamp(timestamp);

        const putAssetPropertyValueEntry =  new PutAssetPropertyValueEntry()
            .withEntryId(`${ENTRY_ID_PREFIX}${i}`)
            .withPropertyAlias("PropertyAlias")
            .withPropertyValues([entry]);
        const sequenceNumber = await client.appendMessage("StreamName", util.validateAndSerializeToJsonBytes(putAssetPropertyValueEntry));
    } catch (e) {
        // Properly handle errors.
    }
});
client.onError((err) => {
    // Properly handle connection errors.
    // This is called only when the connection to the StreamManager server fails.
});

Riferimento SDK Node.js:appendMessage|PutAssetPropertyValueEntry

client = StreamManagerClient()
 
try:
    # Append an Amazon S3 Task definition and print the sequence number.
    s3_export_task_definition = S3ExportTaskDefinition(input_url="URLToFile", bucket="BucketName", key="KeyName")
    sequence_number = client.append_message(stream_name="StreamName", data=Util.validate_and_serialize_to_json_bytes(s3_export_task_definition))
except StreamManagerException:
    pass
    # Properly handle errors.
except ConnectionError or asyncio.TimeoutError:
    pass
    # Properly handle errors.

Riferimento SDK Python:append_message|Definizione attività di esportazione S3

try (final StreamManagerClient client = GreengrassClientBuilder.streamManagerClient().build()) {
    // Append an Amazon S3 export task definition and print the sequence number.
    S3ExportTaskDefinition s3ExportTaskDefinition = new S3ExportTaskDefinition()
        .withBucket("BucketName")
        .withKey("KeyName")
        .withInputUrl("URLToFile");
    long sequenceNumber = client.appendMessage("StreamName", ValidateAndSerialize.validateAndSerializeToJsonBytes(s3ExportTaskDefinition));
} catch (StreamManagerException e) {
    // Properly handle exception.
}

Riferimento SDK Java:appendMessage|Definizione attività di esportazione S3

const client = new StreamManagerClient();
client.onConnected(async () => {
    try {
     // Append an Amazon S3 export task definition and print the sequence number.
     const taskDefinition = new S3ExportTaskDefinition()
        .withBucket("BucketName")
        .withKey("KeyName")
        .withInputUrl("URLToFile");
        const sequenceNumber = await client.appendMessage("StreamName", util.validateAndSerializeToJsonBytes(taskDefinition)));
    } catch (e) {
        // Properly handle errors.
    }
});
client.onError((err) => {
    // Properly handle connection errors.
    // This is called only when the connection to the StreamManager server fails.
});

Riferimento SDK Node.js:appendMessage|Definizione attività di esportazione S3

client = StreamManagerClient()
 
try:
    message_list = client.read_messages(
        stream_name="StreamName",
        # By default, if no options are specified, it tries to read one message from the beginning of the stream.
        options=ReadMessagesOptions(
            desired_start_sequence_number=100,
            # Try to read from sequence number 100 or greater. By default, this is 0.
            min_message_count=10,
            # Try to read 10 messages. If 10 messages are not available, then NotEnoughMessagesException is raised. By default, this is 1.
            max_message_count=100,  # Accept up to 100 messages. By default this is 1.
            read_timeout_millis=5000
            # Try to wait at most 5 seconds for the min_messsage_count to be fulfilled. By default, this is 0, which immediately returns the messages or an exception.
        )
    )
except StreamManagerException:
    pass
    # Properly handle errors.
except ConnectionError or asyncio.TimeoutError:
    pass
    # Properly handle errors.

Riferimento SDK Python:read_messages|ReadMessagesOptions

try (final StreamManagerClient client = GreengrassClientBuilder.streamManagerClient().build()) {
    List<Message> messages = client.readMessages("StreamName",
            // By default, if no options are specified, it tries to read one message from the beginning of the stream.
            new ReadMessagesOptions()
                    // Try to read from sequence number 100 or greater. By default this is 0.
                    .withDesiredStartSequenceNumber(100L)
                    // Try to read 10 messages. If 10 messages are not available, then NotEnoughMessagesException is raised. By default, this is 1.
                    .withMinMessageCount(10L)
                    // Accept up to 100 messages. By default this is 1.
                    .withMaxMessageCount(100L)
                    // Try to wait at most 5 seconds for the min_messsage_count to be fulfilled. By default, this is 0, which immediately returns the messages or an exception.
                    .withReadTimeoutMillis(Duration.ofSeconds(5L).toMillis())
    );
} catch (StreamManagerException e) {
    // Properly handle exception.
}

Riferimento SDK Java:readMessages|ReadMessagesOptions

const client = new StreamManagerClient();
client.onConnected(async () => {
    try {
        const messages = await client.readMessages("StreamName",
            // By default, if no options are specified, it tries to read one message from the beginning of the stream.
            new ReadMessagesOptions()
                // Try to read from sequence number 100 or greater. By default this is 0.
                .withDesiredStartSequenceNumber(100)
                // Try to read 10 messages. If 10 messages are not available, then NotEnoughMessagesException is thrown. By default, this is 1.
                .withMinMessageCount(10)
                // Accept up to 100 messages. By default this is 1.
                .withMaxMessageCount(100)
                // Try to wait at most 5 seconds for the minMessageCount to be fulfilled. By default, this is 0, which immediately returns the messages or an exception.
                .withReadTimeoutMillis(5 * 1000)
        );
    } catch (e) {
        // Properly handle errors.
    }
});
client.onError((err) => {
    // Properly handle connection errors.
    // This is called only when the connection to the StreamManager server fails.
});

Riferimento SDK Node.js:readMessages|ReadMessagesOptions

client = StreamManagerClient()
 
try:
    stream_names = client.list_streams()
except StreamManagerException:
    pass
    # Properly handle errors.
except ConnectionError or asyncio.TimeoutError:
    pass
    # Properly handle errors.

Riferimento SDK Python:list_streams

try (final StreamManagerClient client = GreengrassClientBuilder.streamManagerClient().build()) {
    List<String> streamNames = client.listStreams();
} catch (StreamManagerException e) {
    // Properly handle exception.
}

Riferimento SDK Java:listStreams

const client = new StreamManagerClient();
client.onConnected(async () => {
    try {
        const streams = await client.listStreams();
    } catch (e) {
        // Properly handle errors.
    }
});
client.onError((err) => {
    // Properly handle connection errors.
    // This is called only when the connection to the StreamManager server fails.
});

Riferimento SDK Node.js:listStreams

client = StreamManagerClient()
 
try:
    stream_description = client.describe_message_stream(stream_name="StreamName")
    if stream_description.export_statuses[0].error_message:
        # The last export of export destination 0 failed with some error
        # Here is the last sequence number that was successfully exported
        stream_description.export_statuses[0].last_exported_sequence_number
 
    if (stream_description.storage_status.newest_sequence_number >
            stream_description.export_statuses[0].last_exported_sequence_number):
        pass
        # The end of the stream is ahead of the last exported sequence number
except StreamManagerException:
    pass
    # Properly handle errors.
except ConnectionError or asyncio.TimeoutError:
    pass
    # Properly handle errors.

Riferimento SDK Python:describe_message_stream

try (final StreamManagerClient client = GreengrassClientBuilder.streamManagerClient().build()) {
    MessageStreamInfo description = client.describeMessageStream("StreamName");
    String lastErrorMessage = description.getExportStatuses().get(0).getErrorMessage();
    if (lastErrorMessage != null && !lastErrorMessage.equals("")) {
        // The last export of export destination 0 failed with some error.
        // Here is the last sequence number that was successfully exported.
        description.getExportStatuses().get(0).getLastExportedSequenceNumber();
    }
 
    if (description.getStorageStatus().getNewestSequenceNumber() >
            description.getExportStatuses().get(0).getLastExportedSequenceNumber()) {
        // The end of the stream is ahead of the last exported sequence number.
    }
} catch (StreamManagerException e) {
    // Properly handle exception.
}

Riferimento SDK Java:describeMessageStream

const client = new StreamManagerClient();
client.onConnected(async () => {
    try {
        const description = await client.describeMessageStream("StreamName");
        const lastErrorMessage = description.exportStatuses[0].errorMessage;
        if (lastErrorMessage) {
            // The last export of export destination 0 failed with some error.
            // Here is the last sequence number that was successfully exported.
            description.exportStatuses[0].lastExportedSequenceNumber;
        }
 
        if (description.storageStatus.newestSequenceNumber >
            description.exportStatuses[0].lastExportedSequenceNumber) {
            // The end of the stream is ahead of the last exported sequence number.
        }
    } catch (e) {
        // Properly handle errors.
    }
});
client.onError((err) => {
    // Properly handle connection errors.
    // This is called only when the connection to the StreamManager server fails.
});

Riferimento SDK Node.js:describeMessageStream

client = StreamManagerClient()
 
try:
    message_stream_info = client.describe_message_stream(STREAM_NAME)
    message_stream_info.definition.max_size=536870912
    message_stream_info.definition.stream_segment_size=33554432
    message_stream_info.definition.time_to_live_millis=3600000
    message_stream_info.definition.strategy_on_full=StrategyOnFull.RejectNewData
    message_stream_info.definition.persistence=Persistence.Memory
    message_stream_info.definition.flush_on_write=False
    message_stream_info.definition.export_definition.kinesis=
        [KinesisConfig(  
            # Updating Export definition to add a Kinesis Stream configuration.
            identifier=str(uuid.uuid4()), kinesis_stream_name=str(uuid.uuid4()))]
    client.update_message_stream(message_stream_info.definition)
except StreamManagerException:
    pass
    # Properly handle errors.
except ConnectionError or asyncio.TimeoutError:
    pass
    # Properly handle errors.

Riferimento SDK Python:Aggiorna Message Stream|MessageStreamDefinition

try (final StreamManagerClient client = GreengrassClientBuilder.streamManagerClient().build()) {
    MessageStreamInfo messageStreamInfo = client.describeMessageStream(STREAM_NAME);
    // Update the message stream with new values.
    client.updateMessageStream(
        messageStreamInfo.getDefinition()
            .withStrategyOnFull(StrategyOnFull.RejectNewData) // Required. Updating Strategy on full to reject new data.
            // Max Size update should be greater than initial Max Size defined in Create Message Stream request
            .withMaxSize(536870912L) // Update Max Size to 512 MB.
            .withStreamSegmentSize(33554432L) // Update Segment Size to 32 MB.
            .withFlushOnWrite(true) // Update flush on write to true.
            .withPersistence(Persistence.Memory) // Update the persistence to Memory.
            .withTimeToLiveMillis(3600000L)  // Update TTL to 1 hour.
            .withExportDefinition(
                // Optional. Choose where/how the stream is exported to the Cloud AWS.
                messageStreamInfo.getDefinition().getExportDefinition().
                    // Updating Export definition to add a Kinesis Stream configuration.
                    .withKinesis(new ArrayList<KinesisConfig>() {{
                        add(new KinesisConfig()
                            .withIdentifier(EXPORT_IDENTIFIER)
                            .withKinesisStreamName("test"));
                        }})
            );
} catch (StreamManagerException e) {
    // Properly handle exception.
}

Riferimento SDK Java:update_message_stream|MessageStreamDefinition

const client = new StreamManagerClient();
client.onConnected(async () => {
    try {
        const messageStreamInfo = await c.describeMessageStream(STREAM_NAME);
        await client.updateMessageStream(
            messageStreamInfo.definition
                // Max Size update should be greater than initial Max Size defined in Create Message Stream request
                .withMaxSize(536870912)  // Default is 256 MB. Updating Max Size to 512 MB.
                .withStreamSegmentSize(33554432)  // Default is 16 MB. Updating Segment Size to 32 MB.
                .withTimeToLiveMillis(3600000)  // By default, no TTL is enabled. Update TTL to 1 hour.
                .withStrategyOnFull(StrategyOnFull.RejectNewData)  // Required. Updating Strategy on full to reject new data.
                .withPersistence(Persistence.Memory)  // Default is File. Update the persistence to Memory
                .withFlushOnWrite(true)  // Default is false. Updating to true.
                .withExportDefinition(  
                    // Optional. Choose where/how the stream is exported to the Cloud AWS.
                    messageStreamInfo.definition.exportDefinition
                        // Updating Export definition to add a Kinesis Stream configuration.
                        .withKinesis([new KinesisConfig().withIdentifier(uuidv4()).withKinesisStreamName(uuidv4())])
                )
        );
    } catch (e) {
        // Properly handle errors.
    }
});
client.onError((err) => {
    // Properly handle connection errors.
    // This is called only when the connection to the StreamManager server fails.
});

Riferimento SDK Node.js:Aggiorna Message Stream|MessageStreamDefinition

client = StreamManagerClient()
 
try:
    client.delete_message_stream(stream_name="StreamName")
except StreamManagerException:
    pass
    # Properly handle errors.
except ConnectionError or asyncio.TimeoutError:
    pass
    # Properly handle errors.

Riferimento SDK Python:deleteMessageStream

try (final StreamManagerClient client = GreengrassClientBuilder.streamManagerClient().build()) {
    client.deleteMessageStream("StreamName");
} catch (StreamManagerException e) {
    // Properly handle exception.
}

Riferimento SDK Java:delete_message_stream

const client = new StreamManagerClient();
client.onConnected(async () => {
    try {
        await client.deleteMessageStream("StreamName");
    } catch (e) {
        // Properly handle errors.
    }
});
client.onError((err) => {
    // Properly handle connection errors.
    // This is called only when the connection to the StreamManager server fails.
});

Riferimento SDK Node.js:deleteMessageStream