Object Message

base message object

Message objects are compatible withmqEach module can be used to build a custom message processing system, the creation method:

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var mq = require("mq");
var m = new mq.Message();

inheritance relationship

Constructor

Message

message object constructor

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new Message();

constant

TEXT

Specify message type 1, which represents a text type

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const Message.TEXT = 1;

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BINARY

Specify message type 2, representing a binary type

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const Message.BINARY = 2;

member attribute

value

String, the basic content of the message

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String Message.value;

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params

NArray, the basic parameters of the message

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readonly NArray Message.params;

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type

Integer, message type

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Integer Message.type;

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data

Value, the data of the query message, this attribute will return different data according to the content-type, when it is text, it will return the text, which isjsonreturn whenjson, otherwise return binary

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readonly Value Message.data;

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body

SeekableStream, a stream object containing the message data part

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SeekableStream Message.body;

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length

Long, the length of the data part of the message

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readonly Long Message.length;

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stream

Stream, the stream object when querying the message readFrom

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readonly Stream Message.stream;

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lastError

String, query and set message processing last error

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String Message.lastError;

member function

read

Read data of specified size from the stream, this method is an alias of the corresponding method of body

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Buffer Message.read(Integer bytes = -1) async;

Call parameters:

• bytes: Integer, specify the amount of data to read, the default is to read data blocks of random size, the size of the read data depends on the device

return result:

• Buffer, returns the data read from the stream, or null if there is no data to read or the connection is interrupted

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readAll

Read all remaining data from the stream, this method is an alias of the corresponding method of body

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Buffer Message.readAll() async;

return result:

• Buffer, returns the data read from the stream, or null if there is no data to read or the connection is interrupted

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write

Write the given data, this method is an alias of the corresponding method of body

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Message.write(Buffer data) async;

Call parameters:

• data:Buffer, given the data to be written

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json

Write the given data in JSON encoding

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Value Message.json(Value data);

Call parameters:

• data: Value, given the data to write

return result:

• Value, this method will not return data

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Parse the data in the message in JSON encoding

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Value Message.json();

return result:

• Value, returns the parsed result

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pack

bymsgpackEncode writes the given data

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Value Message.pack(Value data);

Call parameters:

• data: Value, given the data to write

return result:

• Value, this method will not return data

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bymsgpackEncode the data in the parsed message

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Value Message.pack();

return result:

• Value, returns the parsed result

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end

Set the current message processing to end,ChainProcessor does not continue subsequent transactions

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Message.end();

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isEnded

Query whether the current message is over

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Boolean Message.isEnded();

return result:

• Boolean, return true when finished

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clear

Clear the content of the message

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Message.clear();

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sendTo

send a formatted message to the given stream object

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Message.sendTo(Stream stm) async;

Call parameters:

• stm:Stream, specifies the stream object that receives the formatted message

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readFrom

Reads a formatted message from the given cached stream object, and parses the populated object

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Message.readFrom(Stream stm) async;

Call parameters:

• stm:Stream, specifies the stream object for reading formatted messages

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toString

Return the string representation of the object, generally return "[Native Object]", the object can be reimplemented according to its own characteristics

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String Message.toString();

return result:

• String, returns a string representation of the object

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toJSON

Returns the JSON format representation of the object, generally returns a collection of readable properties defined by the object

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Value Message.toJSON(String key = "");

Call parameters:

• key: String, not used

return result:

• Value, which returns a JSON-serializable value