CN111367479A - Cloud printing method, printing method of cloud printing service platform and storage medium - Google Patents
Cloud printing method, printing method of cloud printing service platform and storage medium Download PDFInfo
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- CN111367479A CN111367479A CN202010125468.9A CN202010125468A CN111367479A CN 111367479 A CN111367479 A CN 111367479A CN 202010125468 A CN202010125468 A CN 202010125468A CN 111367479 A CN111367479 A CN 111367479A
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1202—Dedicated interfaces to print systems specifically adapted to achieve a particular effect
- G06F3/1203—Improving or facilitating administration, e.g. print management
- G06F3/1209—Improving or facilitating administration, e.g. print management resulting in adapted or bridged legacy communication protocols, e.g. emulation, protocol extension
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1202—Dedicated interfaces to print systems specifically adapted to achieve a particular effect
- G06F3/1222—Increasing security of the print job
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L67/14—Session management
- H04L67/143—Termination or inactivation of sessions, e.g. event-controlled end of session
- H04L67/145—Termination or inactivation of sessions, e.g. event-controlled end of session avoiding end of session, e.g. keep-alive, heartbeats, resumption message or wake-up for inactive or interrupted session
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Abstract
The invention provides a cloud printing method, a printing method of a cloud printing service platform and a storage medium, wherein the cloud printing method comprises a first connection step, a detection step, a first acquisition step and a forwarding step. And the heartbeat mechanism of the invention adds the treatment of IdleStateHandler on the long connection of Netty, respectively sends a ping message to the client in the overtime or idle time of reading and writing to keep heartbeat detection, and recycles the disconnected connection to avoid resource leakage. The method relies on the natural performance advantages of Netty, is quite convenient for development and integration, basically does not need to be changed too much, and can stably and continuously provide service for customers.
Description
Technical Field
The invention relates to the technical field of internet printing, in particular to a cloud printing method, a printing method of a cloud printing service platform and a storage medium.
Background
At present, in a cloud printing project, a bill printer matched with cloud management is adopted, so that individuals, stores or business partners can independently make a bill and print the bill, and the package collecting efficiency is improved. All printer brand partners are managed and docked by a headquarter purchasing department in an integrated mode, and then authorized to be used by the partners, so that the management and control performance of the printers is improved, and the use complexity is reduced.
In the prior art, JDK (Java Development kit) is a software Development kit in Java language, and JDK is native to have a set of network Application Program Interfaces (APIs), but has a series of problems, mainly including: 1) NIO, java, NIO is called java non-blocking IO, and refers to a new API provided in JDK 1.4 and above, and provides a data container for cache support for all original types (except boolean types), and it is used to provide class libraries and APIs of non-blocking high-scalability networks, but you need to know Selector, serversockchannel, SocketChannel, ByteBuffer, etc. skillfully.
2) Additional skill is required to make the matting: for example, familiar with Java multithreading because NIO programming involves a Reactor mode, you must be very familiar with multithreading and network programming to write a high quality NIO program. 3) The reliability capability is well-complemented, and the development workload and the development difficulty are very high: for example, the client is faced with disconnection reconnection, network flash, half-packet read-write, failure cache, network congestion and processing of abnormal code streams, and the like. The feature of NIO programming is that function development is relatively easy, but reliability capability completion effort and difficulty are very large. 4) Bug for NIO in JDK: e.g., Epoll Bug, which results in null polling by the Selector, ultimately resulting in 100% CPU. The official states that updates in JDK version 1.6 fix the problem, but it still exists until JDK version 1.7, except that the Bug occurrence probability is reduced somewhat, it is not solved at all.
Netty is a popular asynchronous event-driven Java open source web application framework for rapid development of maintainable high-performance protocol servers and clients. The Netty encapsulates the NIO API of the JDK, so that the complexity is greatly reduced, and developers can develop services without relation to the underlying technology. The main characteristics are: 1) the design is elegant: the method is suitable for unified API blocking and non-blocking of various transmission types; based on a flexible and extensible event model, points of interest can be clearly separated; a highly customizable threading model (single thread, one or more thread pools); true connectionless datagram socket support. 2) The use is convenient: java doc, user guide and examples of detailed records. 3) High performance, higher throughput: the delay is lower; the resource consumption is reduced; unnecessary memory replication is minimized. 4) Safety: complete SSL/TLS (secure sockets layer/secure transport layer) and StartTLS support (StartTLS is an extension of the clear text communication protocol that enables the clear text communication link to be directly an encrypted link (using SSL or TLS encryption) without using another special port for encrypted communication, which is opportunistic encryption).
Disclosure of Invention
The invention aims to provide a cloud printing method, a printing method of a cloud printing service platform and a storage medium, and a stable and safe cloud printing framework is built by applying a Netty application mechanism.
In order to achieve the above object, the present invention provides a cloud printing method, including: a first connection step of establishing long connections with a plurality of terminal printers, respectively; a detection step, detecting the unauthorized long connection; a first acquisition step of acquiring a cloud print task; and a forwarding step, namely forwarding the cloud printing task to the terminal printer.
Further, still include: and monitoring, namely monitoring the information of the cloud printing management platform in real time and sending a heartbeat packet to the terminal printer at regular time.
Further, the monitoring step specifically includes: a first sending step, sending a ping instruction to a terminal printer with overtime reading and writing or idle; and a recycling step, recycling the disconnected long connection to avoid resource leakage.
Further, still include: and a storage step, namely, the long connection is kept in a cache so as to accurately find a transmission channel in the next service call for instruction issuing.
Further, still include: and a second acquisition step of acquiring a printing result of the terminal printer.
Further, the first connecting step specifically includes: a first accepting step of accepting the terminal printer request; a selection step of selecting a long connection service according to a policy; and establishing a long connection with the terminal printer.
Further, the first acquiring step specifically includes: a second receiving step of receiving the coding information of the cloud printing service platform; and unpacking, namely decoding the coded information to obtain the cloud printing task.
The invention also provides a printing method of the cloud printing service platform, which comprises the following steps: a third receiving step of receiving order information of a user, wherein the order information comprises an order number and a printing document; a second connection step of establishing a long connection with a corresponding communication service; a step of packet sticking, namely encoding and encrypting the order information; and a second sending step of sending the encrypted order information to a communication service.
Further, still include: and a display step of displaying the printing state of the terminal printer in real time.
The present invention also provides a storage medium storing computer-readable instructions which, when executed by one or more processors, cause the one or more processors to perform the method steps described.
The invention has the beneficial effects that the invention provides the cloud printing method, the printing method of the cloud printing service platform and the storage medium, and safety detection is carried out before long connection is established with the terminal printer by carrying the Netty asynchronous event driven network application program framework, so that malicious connection is prevented. In addition, the heartbeat mechanism of the invention adds the IdleStateHandler processing on the long chain of Netty, respectively sends a ping message to the client in the overtime or idle time of reading and writing to keep heartbeat detection, and recycles the disconnected connection to avoid resource leakage. The method relies on the natural performance advantages of Netty, is quite convenient for development and integration, basically does not need to be changed too much, and can stably and continuously provide service for customers.
Drawings
The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.
Fig. 1 is a flowchart of a cloud printing method provided by the present invention.
Fig. 2 is a specific flowchart of the first connection step provided by the present invention.
Fig. 3 is a specific flowchart of the first obtaining step provided by the present invention.
FIG. 4 is a flow chart of the monitoring steps provided by the present invention.
Fig. 5 is a flowchart of a printing method of the cloud printing service platform provided by the present invention.
FIG. 6 is a schematic diagram of an embodiment of an NIO application provided by the present invention.
Fig. 7 is a schematic diagram of an embodiment of a cloud printing application provided by the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
As shown in fig. 1, the present invention provides a cloud printing method executed by a server, including the following steps S1 to S7.
And S1, a first connection step, namely establishing long connection with the terminal printers respectively.
As shown in fig. 2, the first connection step specifically includes the following steps S101 to S103.
S101, a first receiving step, wherein the terminal printer request is received.
S102, selecting step, selecting long connection service according to the strategy. In this step, the execution policy may be order-first; for terminal printers with a connection between them, a connection may be preferred.
S103, establishing a long connection with the terminal printer.
The long connection of the single machine is limited by the file opening number of the host, so that the connection number of 1-2 ten thousand at most is generally limited for each server, the subsequent number can be conveniently expanded, and the integration of an expandable scheme is performed on different long connection services distributed to different brands of printers.
The Netty service on the server adopts a zookeeper cluster environment, and different brands of printers can be configured to distribute different Netty resources, so that the services of the brands are not influenced.
And S2, detecting the unauthorized long connection.
The detection step is mainly used for preventing malicious connection, specifically, the connection which is not trusted is placed in a delay queue for detection, and the connection which is generally authenticated within 5 seconds is actively destroyed, so that the malicious connection is prevented from occupying server resources.
S3, a first acquisition step, acquiring the cloud printing task.
As shown in fig. 3, the first acquiring step specifically includes the following steps S301 to S302.
S301, a second receiving step of receiving the coding information of the cloud printing service platform.
The coding information processing adopts the self-defined Length FieldBasedFrameDecoder of netty to prevent the message from losing or mistakenly packing.
The data communication message format is as follows.
TABLE 1 data communication message Format
| Message header (4byte) | Message length (4byte) | Instruction code (1byte) | Message content |
S302, unpacking, namely decoding the coded information to obtain the cloud printing task.
And S4, a forwarding step, namely forwarding the cloud printing task to the terminal printer.
And S5, monitoring the information of the cloud printing management platform in real time and sending heartbeat packets to the terminal printer at regular time.
As shown in fig. 4, the monitoring step specifically includes the following steps S501 to S502.
S501, a first sending step, sending a ping instruction to the terminal printer with overtime reading and writing or idle.
S502, a recovery step, namely recovering the disconnected long connection so as to avoid resource leakage.
The heartbeat mechanism of the invention adds the treatment of IdleStateHandler on the long connection of Netty, and respectively sends a ping message to the client in the overtime or idle time of reading and writing to keep heartbeat detection so as to recycle the disconnected connection to avoid resource leakage.
And S6, a storage step, namely, the long connection is kept in a cache so as to accurately find a transmission channel in the next service call for instruction issue.
And the storing step is used for establishing connection according to the strategy in the selecting step when the connection is established next time.
Specifically, the message communication between the server and the terminal printer uses a netty ChannelHandlerAdap to develop the service, and the connection of the terminal is kept in a redis cache, so that a transmission channel can be accurately found in the next service call to issue an instruction.
S7, a second acquisition step, acquiring the printing result of the terminal printer.
Specifically, the step is a feedback step for summarizing the printing results of the terminal printers and printing information by the mobile phone.
Specifically, the printing information includes whether printing was successful, time required for printing, and the amount of ink remaining; and judging the working performance of the terminal printer according to the printing time, the ink quantity and the printing result.
The invention provides a cloud printing method, which carries out safety detection to prevent malicious connection before long connection is established with a terminal printer by carrying a Netty asynchronous event driven network application program framework. In addition, the heartbeat mechanism of the invention adds the IdleStateHandler processing on the long chain of Netty, respectively sends a ping message to the client in the overtime or idle time of reading and writing to keep heartbeat detection, and recycles the disconnected connection to avoid resource leakage. The method relies on the natural performance advantages of Netty, is quite convenient for development and integration, basically does not need to be changed too much, and can stably and continuously provide service for customers.
As shown in fig. 5, the present invention further provides a printing method of a cloud print service platform, including the following steps S801 to S805.
S801, a third receiving step, namely receiving order information of the user, wherein the order information comprises an order number and a printed document.
The user can order the printing task by downloading the customer service end by self, or can order the public number by scanning the two-dimensional code on the printer; after the order is placed, the cloud printing service platform generates order information.
And S802, a second connection step, namely establishing long connection with the corresponding communication service (Netty). A communication service (Netty) runs in the server, i.e. is connected to the server.
And S803, a packet sticking step, namely encrypting the order information code.
The coding information of the sticky packet adopts a self-defined Length FieldBasedFrameDecoder of the netty to prevent the packet loss or packet error of the message.
S804, a second sending step, namely sending the encrypted order information to a communication service.
And S805, a display step of displaying the printing state of the terminal printer in real time. And the printing state is the printing result of the terminal printer.
In addition, when the ink quantity or other performances of the terminal printer are in a problem, the display step gives an alarm in time and repairs in time.
And if the terminal printer which is printing has a problem, the cloud printing service platform resends the printing task to the server, and the server selects a new terminal printer for printing. The premise of this embodiment is that the new terminal printer and the faulty printer are located in the same working area.
In practical application, one working area is provided with a plurality of terminal printers for printing.
The invention also provides a printing method of the cloud printing service platform, which is characterized in that long connection is established with a communication service (Netty), the Netty communication service adopts a zookeeper cluster environment, and a Netty custom LengthFieldBasedFrameDecoder is adopted for encoding information of a sticky packet, so that message packet loss or packet error is prevented.
The present invention also provides an application embodiment, as shown in fig. 6, the operation mode is essentially the concept of NIO. The main reader Thread is responsible for monitoring a server socket of a client (client), receiving (acceptor) new connection, assigning the established socket to a sub reader, wherein the sub reader can be a Thread or a Thread Pool (which can be generally set as CPU core number), is responsible for demultiplexing the connected socket, reads and writes network data (decode-computer-encoder) during queuing task, and throws the network data to a workflow Thread Pool for specific service processing function to complete (decode-computer-encoder). The NIO has three types of threads, namely a mainReactor thread, a subReactor thread and a work thread. Different threads do professional things, and finally each thread is fully utilized, so that the performance of the system is fully exerted.
Specifically, as shown in fig. 7, the Netty communication service corresponds to one working area 200 or a plurality of working areas 200, the working area 200 includes a plurality of terminal printers 201, and the Netty communication service establishes a long connection with the plurality of terminal printers. The Netty communication service and the cloud printing management platform establish long connection, the cloud printing management platform carries a zookeeper cluster environment, and different brands of printers can be configured to distribute different Netty resources.
A server running a Netty communication service serves a maximum number of connections of 1-2 million. Therefore, the capacity expansion is convenient later, and the integration of the expandable scheme is carried out on the distribution of printers in different working areas to different long connection services.
Between the Netty communication service and a plurality of terminal printers, the cloud printing method is executed to work; and between the Netty communication service and the cloud printing management platform, working is carried out by executing the printing method of the cloud printing service platform.
The present invention also provides a storage medium storing computer readable instructions which, when executed by one or more processors, cause the one or more processors to perform the cloud printing method and the printing method steps of the cloud printing service platform.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The principle and the implementation of the present invention are explained in the present text by applying specific examples, and the above description of the examples is only used to help understanding the technical solution and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A cloud printing method, comprising:
a first connection step of establishing long connections with a plurality of terminal printers, respectively;
a detection step, detecting the unauthorized long connection;
a first acquisition step of acquiring a cloud print task;
and a forwarding step, namely forwarding the cloud printing task to the terminal printer.
2. The cloud printing method of claim 1, further comprising:
and monitoring, namely monitoring the information of the cloud printing management platform in real time and sending a heartbeat packet to the terminal printer at regular time.
3. The cloud printing method of claim 2,
the monitoring step specifically comprises:
a first sending step, sending a ping instruction to a terminal printer with overtime reading and writing or idle;
and a recycling step, recycling the disconnected long connection to avoid resource leakage.
4. The cloud printing method of claim 1, further comprising:
and a storage step, namely, the long connection is kept in a cache so as to accurately find a transmission channel in the next service call for instruction issuing.
5. The cloud printing method of claim 1, further comprising:
and a second acquisition step of acquiring a printing result of the terminal printer.
6. The cloud printing method of claim 1,
the first connecting step specifically includes:
a first accepting step of accepting the terminal printer request;
a selection step of selecting a long connection service according to a policy;
and establishing a long connection with the terminal printer.
7. The cloud printing method of claim 1,
the first acquiring step specifically includes:
a second receiving step of receiving the coding information of the cloud printing service platform;
and unpacking, namely decoding the coded information to obtain the cloud printing task.
8. A printing method of a cloud printing service platform is characterized by comprising the following steps:
a third receiving step of receiving order information of a user, wherein the order information comprises an order number and a printing document;
a second connection step of establishing a long connection with a corresponding communication service;
a step of packet sticking, namely encoding and encrypting the order information;
and a second sending step of sending the encrypted order information to a communication service.
9. The printing method of the cloud print service platform according to claim 8, further comprising:
and a display step of displaying the printing state of the terminal printer in real time.
10. A storage medium storing computer readable instructions which, when executed by one or more processors, cause the one or more processors to perform the method steps of any one of claims 1-7 or 8-9.
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| CN113419691A (en) * | 2021-07-01 | 2021-09-21 | 山东白令三维科技有限公司 | 3D printing method and device and 3D printing Internet of things system |
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