SHANGHAI TRIAD A film review by Menno Praas Copyright 1996 Menno Praas
Zhang Yimou, China, 109 min.
Looking for action? Wrong movie. Ever wondered how a fourteen year old boy would feel living amongst Shanghai gang members? This is the movie for you. How does this innocent boy from the Chinese countryside turn up in a violent gang? He happens to be a relative of the godfather of one of the most important gangs in Shanghai in the 1930's. In this capacity he is trusted to be the servant of beautiful nightclub singer Bijou (played by Gong Li). She is the gang leader's concubine, living in every conceivable luxury. The boy gets very close to the gang's daily life. He is aware of violence around him, but seems unable to grasp the reality of it. What he experiences threathens his peace of mind but exceeds his comprehension.
In this movie director Zhang Yimou prefers to suggest the use of force, rather than showing it. He also deliberately leaves out most action, an important ingredient of Western style Coppola and Scorsese mafia movies. During the making of the movie Zhang Yimou was in the process of separating from his partner Gong Li. Despite this, Zhang Yimou offers Gong Li lots of time to expose her beauty and qualities to the public. In my opinion Gong Li fills too many gaps in the scenario by singing a choice of Chinese lovesongs in the nightclub.
 She tries her luck when she is having an affair with the gang's second in command. The gang survives a fierce attack from a rivalling gang. The leader decides to go in tactic hiding. The gang escapes for a couple of days to an island off the coast. Bijou and the boy join them. Bored with the quiet island Bijou has several conversations with a widow, living a primitive, but happy life on the island. In these conversations Bijou re-accepts her own low family background. Suddenly, the movie shifts into action. By accident the boy witnesses the preparations of a new attack on the gang. Now the plot thickens. The final battle takes place outside the view of the camera. We just witness bodies piling up. Meanwhile Bijou is ready to abandon her superficial and luxurious lifestyle and acknowledges her true nature. To me, Gong Li doesn't quite convince in her acting on this point. Finally, as the boy's world completely turns upside down, the story reaches its conclusion.
Menno Praas<EMAIL_ADDRESS>The review above was posted to the
rec.arts.movies.reviews newsgroup (de.rec.film.kritiken for German reviews).
The Internet Movie Database accepts no responsibility for the contents of the
review and has no editorial control. Unless stated otherwise, the copyright
belongs to the author.
Please direct comments/criticisms of the review to relevant newsgroups.
Broken URLs inthe reviews are the responsibility of the author.
The formatting of the review is likely to differ from the original due
to ASCII to HTML conversion.
Related links: index of all rec.arts.movies.reviews reviews


Chick-Fil-A to Stop Donating to Anti-LGBTQ Organizations
by VladTVChick-Fil-A is definitely known for their chicken sandwiches, and have faced some competition recently with Popeyes and their now-infamous chicken sandwiches. However, Chick-Fil-A and their stance against the LGBTQ community has also become a focus of the public. Now, the company has come out to say they will no longer be donating to companies that have an anti-LGBTQ stance.
The COO of the company issued a statement saying, “here’s no question we know that, as we go into new markets, we need to be clear about who we are. There are lots of articles and newscasts about Chick-fil-A, and we thought we needed to be clear about our message.” The company will reportedly no longer be giving money to the Paul Anderson Youth Home, the Fellowship of Christian Athletes, and the Salvation Army.
source: Bisnow


|
ViennaLS
|
ViennaLS is a header-only C++ level set library developed for high performance topography simulations. The main design goals are simplicity and efficiency, tailored towards scientific simulations. ViennaLS can also be used for visualisation applications, although this is not the main design target.
IMPORTANT NOTE: ViennaLS is under heavy development and improved daily. If you do have suggestions or find bugs, please let us know!
Documentation and Examples can be found online.
Bug reports and suggestions should be filed on GitHub.
Releases are tagged on the maser branch and available in the releases section.
* Windows (Visual Studio)
* Linux (g++ / clang)
* macOS (XCode)
* C++17 Compiler with OpenMP support
* VTK (optional)
* pybind11 (only for building Python libs)
Have a look at the example repo for creating a project with ViennaLS as a dependency.
Since this is a header only project, it does not require any installation. However, we recommend the following procedure in order to set up all dependencies correctly:
This will install the necessary headers and CMake files to the specified path. If DCMAKE_INSTALL_PREFIX is not specified, it will be installed to the standard path for your system, usually /usr/local/ .
In order to install ViennaLS without VTK, run:
If you want to use your own install of dependencies, just specify the directories of dependencies in CMake:
It is possible to specify one preinstalled dependency and automatically install the others, by just passing the path to one dependency as shown above, but not the others, i.e. for using preinstalled vtk but automatically installed ViennaHRLE and pybind11:
The Releases only contain the compiled library for the most common Python version per platform: * Windows: Python 3.8 * Linux: Python 3.8
For all other Python versions, you have to build the library yourself (see below).
In order to use ViennaLS in python, just download the python shared libraries from the releases section and put it in your current folder. From this folder just import the 2D or the 3D version of the library:
All functions which are available in C++ are also available in Python. In order to switch to three dimensions, only the import needs to be changed:
In order to build the python module, set VIENNALS_BUILD_PYTHON_2
or VIENNALS_BUILD_PYTHON_3
to ON
:
If both options are on, only VIENNALS_BUILD_PYTHON_3 will be used, since only one version can be built at a time.
If you just want to install all dependencies before doing anything else, run:
This will take some time the first time it is run. The dependencies only need to be set up once.
ViennaLS uses CTest to run its tests. In order to check whether ViennaLS runs without issues on your system, you can run:
The examples can be built using CMake:
In order to use this library in your CMake project, add the following lines to the CMakeLists.txt of your project:
In order to save build time during developement, dynamically linked shared libraries can be used if ViennaLS was built with them. This is done by precompiling the most common template specialisations. In order to use shared libraries, use
If ViennaLS was build with shared libraries and you use ViennaLS in your project (see above), CMake will automatically link them to your project. In order to build a release of your own project with better runtime performance, but longer build times, use the following CMake option when building a release:
Before being able to merge your PR, make sure you have met all points on the checklist in CONTRIBUTING.md.
If you want to contribute to ViennaLS, make sure to follow the LLVM Coding guidelines. Before creating a pull request, make sure ALL files have been formatted by clang-format, which can be done using the format-project.sh script in the root directory.
Current contributors: Lado Filipovic, Paul Manstetten, Xaver Klemenschits and Josef Weinbub
Founder and initial developer: Otmar Ertl
Contact us via: vienn.nosp@m.ats@.nosp@m.iue.t.nosp@m.uwie.nosp<EMAIL_ADDRESS>ViennaLS was developed under the aegis of the 'Institute for Microelectronics' at the 'TU Wien'. http://www.iue.tuwien.ac.at/
See file LICENSE in the base directory.


/**
* @module fgt-mah-ssapp.LOCALE
*/
/**
* defines the localizes strings for the whole ssapp
*/
const LOCALE = {
en_US: {
home: {
title: "Pharmaledger's Finished Good Traceability Application for Wholesalers"
},
registration: {
title: "Please register as a Wholesaler",
name: {
label: "Registered Wholesaler's name:",
placeholder: 'Please enter your name here...',
value: 'PDM the Wholesaler',
required: true
},
id: {
label: 'Registered Id:',
placeholder: 'Please enter your id here...',
value: '#ThIsIsAwHoLeSaLeRiD=',
required: true
},
email: {
label: 'Registered Email:',
placeholder: 'Please enter your email here...',
value<EMAIL_ADDRESS>required: true
},
tin: {
label: 'Registered TIN (Tax Identification Number):',
placeholder: "Enter your TIN (Tax Identification Number)...",
value: 500000000,
required: true
},
address: {
label: 'Registered Address:',
placeholder: "Enter your address...",
required: true,
value: "This in an Address"
},
register: "Register"
},
dashboard:{
title: "This is a Dashboard",
none: "There are no pending orders"
},
processorders: {
title: "Pending Orders",
requesterIdHeader: "Requester Id",
orderIdHeader: "Order Id",
orderLinesHeader: "Order lines",
actionsHeader: "Actions",
gtinHeader: "Gtin",
nameHeader: "Name",
quantityHeader: "Quantity",
none: "No pending orders..."
},
shipment: {
title: "Fill new Shipment Details:",
add: "Add Shipment",
name: {
label: "Product name:",
placeholder: 'Please enter the product name here...',
value: 'PDM product',
required: true
},
gtin: {
label: "Product gtin:",
placeholder: 'Please enter your name here...',
value: '05290931025615',
required: true
},
description: {
label: "Product description:",
placeholder: 'Please enter the product description here...',
value: 'This product is very good for you'
},
manufName: {
label: "Marketing Authorization Holder:"
}
},
shipments: {
title: "Shipment Manager",
shipmentIdHeader: "Shipment Id",
productsHeader: "Products",
shipmentStatusHeader: "Status"
},
stock: {
title: "Stock Manager",
gtinHeader: "Gtin",
nameHeader: "Name",
batchesHeader: "Batches",
quantityHeader: "Quantity",
none: "No products in stock..."
}
}
}


Senior Project Fair
Zachary Cohen
Hubo
I learned how to design in Creo Parametric
I learned how to print my designs
I learned to use python, html and maestor
I found the limits of every upperbody joint on Hubo
How I feel about this kind of work


SignUp to get Notified for Vaccination
A website where you can be notified if a vaccine is available in your pincode. To know whether vaccine is available at your location for your age, you needed to check the Co-Win app every time. So I just automated that process, you register in this system and we will email you the moment when there is a vaccine. For more visit CO-WIN


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IBM employees
Related Links


Click here for more information on lions
They are often called house cats when kept as indoor pets or simply cats when there is no need to distinguish them from other felids and felines. They are often valued by humans for companionship.
There are more than seventy cat breeds recognized by various cat registries..
Cats were venerated in ancient Egypt, but there may have been instances of domestication as early as the Neolithic from around 9,500 years ago (7500 BC). Did you know that, The felids are a rapidly evolving family of mammals that includes:
Present in Africa and India, the lion typically inhabits grasslands and savannahs, but is absent in dense forests. It is usually more diurnal than other big cats, but when persecuted adapts to being active at night and at twilight. A lion pride consists of a few adult males, related females and cubs. Prides vary in size and composition from three to 20 adult lions, depending on habitat and prey availability. Females cooperate when hunting and prey mostly on large ungulates, including antelope, deer, buffalo, zebra and even giraffe
| Characteristics | Behaviour |
|---|---|
| The lion is a muscular, deep-chested cat with a short, rounded head, a reduced neck and round ears | Lions spend much of their time and resting, and are inactive for about 20 hours per day. |


{% responsive_image_block %}
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alt: {{ include.alt1 }}
template: _includes/responsive-float-thumb.html
{% endresponsive_image_block %}
{% if include.alt1 %}
{{ include.alt1 }}
{% endif %}
{% responsive_image_block %}
path: "assets/img/{{ include.name2 }}"
alt: {{ include.alt2 }}
template: _includes/responsive-float-thumb.html
{% endresponsive_image_block %}
{% if include.alt2 %}
{{ include.alt2 }}
{% endif %}
{% responsive_image_block %}
path: "assets/img/{{ include.name3 }}"
alt: {{ include.alt3 }}
template: _includes/responsive-float-thumb.html
{% endresponsive_image_block %}
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{% endif %}


--- layout: archive title: Zulip Chat Archive permalink: /stream/113488-general/topic/prime.20in.20.60ring_theory.2Fassociated.2Elean.60.html ---
ring_theory/associated.lean
defines
/-- prime element of a semiring -/ def prime [comm_semiring α] (p : α) : Prop := p ≠ 0 ∧ ¬ is_unit p ∧ (∀a b, p ∣ a * b → p ∣ a ∨ p ∣ b)
in the root namespace, which then causes clashes with nat.prime
if you have nat
open.
Could we rename or namespace this? @Johannes Hölzl introduced it here.
We could just get rid of nat prime as well.
wat @_@
What do you mean, @Chris Hughes?
Just get rid of nat.prime
and use prime in its place. I just realized that currently nat.prime is basically irreducible
, so this would be a non trivial redactor.
Oh, I see! That sounds both a good idea and ambitious. :-)
Is there a good fix in the meantime?
I would just call this one ring.prime
I'm okay with ring.prime
if the kill nat.prime thing doesn't work
although I've already fixed some bugs caused by this in the library (adding nat.prime
when nat
was open), maybe they should be re-ambiguated if it lands?
Last updated: Apr 24 2020 at 19:02 UTC


#!chuck_extends "project/base.html" #!chuck_renders content The big MOOOOOH has pwned you! #!end #!chuck_extends "project/base2.html" #!chuck_renders content Balle was here :) #!end


In this next case study, we examine the argument that “life begins at conception”. Many pro life groups claim that life begins at conception. One such group is Pro-Life Wisconsin 4 . On this organization’s webpage 5 , they write: Figure 1.8.3. A snippet from the Pro-Life Wisconsin's website.


Technology
This page collects the softwares and technologies that are used to devolop the project, and they are also briefly describe.
  Qgis
Version: 3.4.10-Madeira
QGIS is a free and open-source cross-platform desktop geographic information system (GIS) application that supports viewing, editing, and analysis of geospatial data.
It is used for different phases of the work: visualization of the downloaded data; pre-processing, intercomparison, and validation.
In each phase the most appropriate processing toolbox, plugins, and script are exploited to reach the scope.
Qgis is free and open-source software distributed under GNU General Public License Version 2.
  GeoServer
Version: 2.15.1
GeoServer is a Java-based software server that allows users to publishes data from any major spatial data source using open standards. GeoServer implements several Open Geospatial Consortium protocols including Web Map Service (WMS), Web Feature Service (WFS), Web Coverage Service (WCS) and Web Map Tile Service (WMTS). Additional extensions are available for Catalogue Service (CSW) and Web Processing Service (WPS).
  OpenLayers
Version: v6.5.0
OpenLayers makes it easy to put a dynamic map in any web page. It can display map tiles, vector data and markers loaded from any source. OpenLayers has been developed to further the use of geographic information of all kinds. It is completely free, Open Source JavaScript, released under the 2-clause BSD License (also known as the FreeBSD).
  Sublime Text
Version: 3.2.2
Sublime Text is a shareware cross-platform source code editor with a Python application programming interface (API). It natively supports many programming languages and markup languages, and functions can be added by users with plugins, typically community-built and maintained under free-software licenses.
  GitHub
Version: 2.17.1
Git is a distributed version-control system for tracking changes in any set of files, originally designed for coordinating work among programmers cooperating on source code during software development.Its goals include speed, data integrity, and support for distributed, non-linear workflows.
Git is free and open-source software distributed under GNU General Public License Version 2.
Repository: click here


Who should audition for FCS?
Anyone who loves the Lord, loves to sing, and loves to praise and serve the Lord through music. And pray about it! FCS is a very time-consuming commitment, but it is also very rewarding, and God does so much in our group every single year! If that describes you, we'd love to have you audition for us!
Currently, For Christ's Sake is not looking for new members. Auditions typically happen at the beginning of each semester, so watch out for when that time comes around!
Check out our About page for an introduction to who we are, our FAQ page for a more in-depth look at our mission, or feel free to contact us at our email<EMAIL_ADDRESS>for any particular questions or concerns!


Hi ! Thank you for filling out this survey. Based on your results, I think you should check out the track. There, you can . You can find out more about .
Hi ! Thank you for filling out this survey. Unfortunately, the survey was unable to produce a clear winner. You can either try to take it again, read more about the various tracks, or wait and see how your feelings change as your current course goes on!


#include <decoder.h>
|
| | PredecBlk (int num_dec_signals, Decoder *dec, double C_wire_predec_blk_out, double R_wire_predec_blk_out, int num_dec_per_predec, bool is_dram_, bool is_blk1) |
| |
| void | compute_widths () |
| |
| void | compute_area () |
| |
| void | leakage_feedback (double temperature) |
| |
| pair< double, double > | compute_delays (pair< double, double > inrisetime) |
| |
| | Component () |
| |
| | ~Component () |
| |
| double | compute_gate_area (int gate_type, int num_inputs, double w_pmos, double w_nmos, double h_gate) |
| |
| double | compute_tr_width_after_folding (double input_width, double threshold_folding_width) |
| |
| double | height_sense_amplifier (double pitch_sense_amp) |
| |
|
| int | logical_effort (int num_gates_min, double g, double F, double *w_n, double *w_p, double C_load, double p_to_n_sz_ratio, bool is_dram_, bool is_wl_tr_, double max_w_nmos) |
| |
Definition at line 82 of file decoder.h.
◆ PredecBlk()
| PredecBlk::PredecBlk |
( |
int |
num_dec_signals, |
|
|
Decoder * |
dec, |
|
|
double |
C_wire_predec_blk_out, |
|
|
double |
R_wire_predec_blk_out, |
|
|
int |
num_dec_per_predec, |
|
|
bool |
is_dram_, |
|
|
bool |
is_blk1 |
|
) |
| |
◆ compute_area()
| void PredecBlk::compute_area |
( |
| ) |
|
◆ compute_delays()
| pair< double, double > PredecBlk::compute_delays |
( |
pair< double, double > |
inrisetime | ) |
|
◆ compute_widths()
| void PredecBlk::compute_widths |
( |
| ) |
|
◆ leakage_feedback()
| void PredecBlk::leakage_feedback |
( |
double |
temperature | ) |
|
◆ branch_effort_nand2_gate_output
| int PredecBlk::branch_effort_nand2_gate_output |
◆ branch_effort_nand3_gate_output
| int PredecBlk::branch_effort_nand3_gate_output |
◆ C_ld_predec_blk_out
| double PredecBlk::C_ld_predec_blk_out |
◆ dec
◆ delay_nand2_path
| double PredecBlk::delay_nand2_path |
◆ delay_nand3_path
| double PredecBlk::delay_nand3_path |
◆ exist
◆ flag_L2_gate
| int PredecBlk::flag_L2_gate |
◆ flag_two_unique_paths
| bool PredecBlk::flag_two_unique_paths |
◆ is_dram_
◆ min_number_gates_L1
| int PredecBlk::min_number_gates_L1 |
◆ min_number_gates_L2
| int PredecBlk::min_number_gates_L2 |
◆ num_L1_active_nand2_path
| int PredecBlk::num_L1_active_nand2_path |
◆ num_L1_active_nand3_path
| int PredecBlk::num_L1_active_nand3_path |
◆ number_gates_L1_nand2_path
| int PredecBlk::number_gates_L1_nand2_path |
◆ number_gates_L1_nand3_path
| int PredecBlk::number_gates_L1_nand3_path |
◆ number_gates_L2
| int PredecBlk::number_gates_L2 |
◆ number_input_addr_bits
| int PredecBlk::number_input_addr_bits |
◆ number_inputs_L1_gate
| int PredecBlk::number_inputs_L1_gate |
◆ power_L2
◆ power_nand2_path
◆ power_nand3_path
◆ R_wire_predec_blk_out
| double PredecBlk::R_wire_predec_blk_out |
◆ w_L1_nand2_n
| double PredecBlk::w_L1_nand2_n[MAX_NUMBER_GATES_STAGE] |
◆ w_L1_nand2_p
| double PredecBlk::w_L1_nand2_p[MAX_NUMBER_GATES_STAGE] |
◆ w_L1_nand3_n
| double PredecBlk::w_L1_nand3_n[MAX_NUMBER_GATES_STAGE] |
◆ w_L1_nand3_p
| double PredecBlk::w_L1_nand3_p[MAX_NUMBER_GATES_STAGE] |
◆ w_L2_n
| double PredecBlk::w_L2_n[MAX_NUMBER_GATES_STAGE] |
◆ w_L2_p
| double PredecBlk::w_L2_p[MAX_NUMBER_GATES_STAGE] |
The documentation for this class was generated from the following files:
- gpgpu-sim_distribution/src/gpuwattch/cacti/decoder.h
- gpgpu-sim_distribution/src/gpuwattch/cacti/decoder.cc


The service provider interfaces in the Java Debug Interface
(JDI) enable the Connector
and
TransportService
implementations to be developed and
deployed. The TransportService
class represents the
underlying transport service used by a Connector
and
is used to establish connections and transport Java Debug Wire
Protocol (JDWP) packets between a debugger and a target VM.
In addition to service provider interfaces in JDI, the JDK also includes a transport library interface called the Java Debug Wire Protocol Transport Interface (jdwpTransport). This is a native (C/C++) interface to allow the development and deployment of transport libraries. A transport library is loaded by the debuggee-side JDWP agent and is used to establish a connection to the debugger and to transport JDWP packets between the debugger and the VM.
This page describes a number of scenarios where the new interfaces may be used. It also provides an overview of the tasks involved in developing and deploying new Connectors and transport implementations.
The service provider interfaces and the native transport interface are expected to be used by the following classes of users:
Given the above class of user the following describes a number of scenarios where the new interfaces might be used.
On the debuggee-side a transport library for the new transport can be developed by implementing the jdwpTransport interface. For the debugger, a TransportService implementation can be developed. When the TransportService implementation is deployed, the JDI VirtualMachineManager implementation will automatically create an AttachingConnector and a ListeningConnector to allow remote debugging to the target VM.
For these examples, an AttachingConnector
implementation can be developed. The
AttachingConnector
implementation extends
com.sun.jdi.connect.AttachingConnectors
and when
deployed it will appear on the list of attaching connectors
returned by the VirtualMachineManager's
attachingConnectors()
method.
com.sun.jdi.CommandLineLaunch
LaunchingConnector
may not be sufficient. In such
cases the operating system or virtual machine vendor may decide to
develop their own LaunchingConnector
that is capable
of launching the target VM. This new
LaunchingConnector
would have appropriate
Connector
arguments which would be used to configure
the target VM for debugging. Once deployed it will appear on the
list of Connectors
returned by the
VirtualMachineManager
object's
launchingConnectors()
method.In this example the IDE implementer develops a transport library using the jdwpTransport interface. This allows the debuggee to use the new transport. On the debugger-side the IDE implementer has a choice. One option is to develop and deploy a TransportService implementation. This option would allow the new transport to be used for remote debugging.
Alternatively, the IDE implementer may decide to create a Connector implementation that encapsulates the transport. This option is appropriate when the IDE implementer wishes to add new Connector arguments. For example, with a secure transport the IDE implementer may wish to have a Connector that has Connector arguments to specify keystore, pass phrase, or other options needed to configure the secure connection. If a new Connector is appropriate then the IDE implementer develops a transport library for the debuggee-side and a Connector for the debugger-side. The type of Connector is the choice of the implementer - one example is a LaunchingConnector that launches the debuggee and establishes a secure connection between the debugger and debuggee.
Every Connector implementation must have a public no-arg constructor in addition to implementing all the Connector methods. The constructor will be called by the VirtualMachineManager during initialization. The constructor may be a no-op or it may perform initialization tasks such as loading a transport service. The constructor does not throw any checked exceptions so any problems during initialization should be thrown as an Error or other unchecked exceptions.
Connectors are not required to use a TransportService. Some Connectors may connect to the target VM using a mechanism other than a transport (in the Example Scenarios section we list the examples of AttachingConnectors that attach to crash dumps or hung processes). For Connectors that use a TransportService implementation the Connector can either reference the TransportService implementation directly or it can load the implementation at runtime. Connectors that wish to make use of Oracle-provided transports should load the transport service using code such as following:
try { Class c = Class.forName("com.sun.tools.jdi.SocketTransportService"); ts = (TransportService)c.newInstance(); } catch (Exception x) { throw new Error(x); }
Java SE implementations are not required to include Oracle's socket or shared memory transport service implementations so in the above example an Error will be thrown if the transport service does not exist.
Assuming that the type of Connector is known then the following items should be noted when developing the implementation:
VirtualMachine vm = Bootstrap.virtualMachineManager().createVirtualMachine(conn);
The VirtualMachineManager
also involves another
form of the createVirtualMachine
method for use by
LaunchingConnector
instances. The other form allows
the LaunchingConnector
to specify the
java.lang.Process
that represents the debuggee. See
the specification for
com.sun.jdi.VirtualMachineManager
for further
details.
You can view the source code for an example
LaunchingConnector
, SimpleLaunchingConnector.java.
The Connector has a single Connector.Argument
called class that specifies the class name of class to run
in the target VM. The example demonstrates all of the points
discussed previously, including Connector.Argument
,
transport naming, and the use of the createVirtualMachine method.
To deploy a Connector requires packaging the classes for the Connector implementation into a jar file along with a service configuration file that lists the fully-qualified class name of the Connector. The jar file is then deployed in a location that is visible to the system class loader.
The service configuration file that must be included in the jar file is named META-INF/services/com.sun.jdi.connect.Connector. The file simply lists the fully-qualified class names of the Connector included in the jar file. Multiple Connector implementations may be included in the same jar file and in that case the class name for each Connector is listed on a separate line.
Suppose you wish to deploy a launching connector named SimpleLaunchingConnector. In order to deploy this you create a file META-INF/services/com.sun.jdi.connect.Connector similar to the following:
# A very simple launching connector SimpleLaunchingConnector
This service configuration file is then packaged into a jar file along with the classes that comprise the implementation of the Connector:
jar cf SimpleLaunchingConnector.jar \ META-INF/services/com.sun.jdi.connect.Connector \ SimpleLaunchingConnector.class
The jar file is then copied into a location that is visible to the system class loader.
Once deployed the Connector will be located by the debugger when the debugger is restarted. That is, SimpleLaunchingConnector will be included in the list of Connectors returned by VirtualMachineManager's allConnectors() method. In addition, as this is a launching connector, it will also appear on the list of launching connectors returned by the launchingConnectors() method.
Developing a transport service requires developing two components :
The development of a transport service requires a high degree of familiarity with the transport and the underlying communication protocol. A transport service essentially binds JDWP to an underlying communication protocol. The service that it provides is reliable and JDWP packets are exchanged between the debugger and debuggee without duplication or data loss. Given that packets must be exchanged in a reliable manner might mean that additional protocol support be included in the transport service over and beyond that provided by the underlying communication protocol. For example, if debugging over a raw and unreliable serial connection is required, then the transport service implementer may be required to build in error detection and recovery in the implementation to ensure that JDWP packets can be reliably transported between the debugger and the debuggee.
Assuming the details of the transport and underlying communication protocol are understood then the next step is to consider the following:
/dev/ttya;9600,1
Once the above have been resolved then creating a TransportService involves extending com.sun.jdi.connect.spi.TransportService and providing an implementation. The attach and accept methods return an instance of com.sun.jdi.connect.spi.Connection so an implementation of Connection is required so that the debugger can exchange JDWP packets with the debuggee.
You can view an example of a TransportService implementation for Oracle's socket transport, SocketTransportService.java. This is provided for reference purposes only.
To develop a native transport library requires implementing each of the functions listed in the jdwpTransport specification. The function prototypes and definitions are defined in ${java_home}/include/jdwpTransport.h.
The transport library implementer compiles and links the function implementations into a dynamic library (or equivalent). The library exports a function jdwpTransport_OnLoad function which the JDWP agent will call when the transport library is loaded. Some embedded environments don't support dynamic linking and in such environments the transport library may need to be statically linked. In that case there isn't any library loading but the jdwpTransport_OnLoad function will still be called to initialize the transport library and obtain the environment pointer.
As an example of a jdwpTransport implementation, you can download code for Oracle's socket transport library (dt_socket), socketTransport-example.c. This is provided for references purposes only.
A TransportService is deployed in a similar manner to a Connector. To deploy a TransportService requires packaging the classes for the TransportService implementation into a jar file along with a service configuration file that lists the fully-qualified class name of the TransportService. The jar file is then deployed in a location that is visible to the system class loader.
The service configuration file that must be included in the jar file is named META-INF/services/com.sun.jdi.connect.spi.TransportService. As per Connector deployment the configuration file may list the classes names of multiple transport service implementations in the event that the jar file includes multiple implementations.
In the case of a transport service com.sun.SerialTransportService then the service configuration file will be similar to the following :
# Serial line transport com.foo.SerialTransportService
This service configuration file is then packaged into a jar file along with the classes that comprise the implementation. For this example we will assume that the implementation involves a number of classes :
jar cf SerialTransportService.jar \ META-INF/services/com.sun.jdi.connect.spi.TransportService \ com/foo/SerialTransportService.class \ com/foo/SerialConnection.class \ com/foo/SerialCapabilities.clas \ com/foo/SerialIO.class \ com/foo/SerialProtocol.class
As per the deployment of Connectors, the jar file is then copied into a location that is visible to the system class loader.
A TransportService may have native methods or rely on other APIs that require a native library. In that case the native library must be location that allows it be loaded using System.loadLibrary.
A native transport library is loaded by the JDWP agent. In must be located on the normal runtime library search path for the operating systems. For example, on Solaris or Linux systems it must be on search path specified by the LD_LIBRARY_PATH environment variable.


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WebRTC fullmesh learning system
Warning
This system is built for learning purpose, and is supposed to only run locally. Not secure for production use on the internet. DO NOT USE FOR PRODUCTION.
About
WebRTC API is very useful for realtime communication between multiple endpoints. However, the handling of WebRTC API on browser side requires dealing with a lot of events which makes it harder to understand and implement, especially when connecting multiple endpoints. This system is aimed at helping understand the API by making these events visibly tracable by logs.
Characteristics of the system
-
-
Queue based WebRTC instance management
-
This is the most important part of the system. The WebRTC instance is handled by queue and only one is handled at a time so that its icecandidate events are sequentially being handled while exchanging sdps between peers. This is because "onicecandidate" event only gives you an event scope while each endpoint needs to know what(offering offer,received offer, answer)sdps they are exchanging with whom.
-
-
-
Simplified message handling
-
This apaproach is applied for both WebSocket and WebRTC. Every message object has "type" attribute for simplicity. The received message can be handled by a dedicated single responsible method(or function) for switching processes.
This is simple but not a trivial thing. The practical value of this type of simplification on messaging shall appear much more realistic to you when you imagine a system with multiple realtime messaging interfaces constantly communicating without any common message handling protocol.
-
Running Enviroment
This system requires Docker,Web browser and an internet connected enviroment(for preparation)as running enviroment.
The tools for development are as follows:
-
OS
-
Windows 10
-
Docker
-
19.03.5
-
docker-compose
-
1.24.1
However, running on {Debian 10, Chromium and Node.js v10} stack is also checked.
Running issues may be related to the older vereions of your OS,Web brwoser, Docker. Try updating them when things dont work.
Preparation
Assuming you are at cloned repository directory from your terminal(or Command Prompt).
-
Install Docker
(If you are using Windows, make sure repository directory is shared with Docker. Make sharing available when disabled)
-
build Docker image. by running:
docker-compose -f docker-compose.run.yml build --no-cache
For Windows user, alternative command is:
prepare
Running
Assuming you are at cloned repository directory from your terminal(or Command Prompt).
-
run:
docker-compose -f docker-compose.run.yml run
For Windows user, alternative command is:
run
-
Open multiple browser(Chrome) windows, then access
localhost:8080
-
Type names and press OK.This process will connect each windows.
-
Check the connection by messaging.
-
Time to read logs and codes.
Stopping the system
-
-
Stopping from termnal(or Command Prompt), press:
-
Ctrl(Command)+c
If you're asked to press Y/N, then type y and enter.
-
-
-
If you have closed the terminal.
-
docker ps
Shows all the containers currently running. Remember first few letters of the container id(first column)
docker stop ${first few letters of the id}
replace ${id} with the remembered first few letters of the id.
You need to do this for those two(of docker ps):
-
${id} webrtc-fullmesh-learning-system_ws-server
-
${id} webrtc-fullmesh-learning-system_page-server
-
-
Further readings
-
WebRTC API
-
Related sample