Map server URL with query parameters in ArcGIS JS 4.6

Starting from ArcGIS JS 4.6, the map server URL should not have any query parameters. Any query parameters exists in the map server URL will be removed.

To handle this issues, you can override the urlUtils.removeQueryParameters() as below


require(["esri/core/urlUtils"], function(urlUtils) {

   urlUtils.removeQueryParameters = function(a){
      return a;
   };

});

But somehow that's a bad trick. A better way is to use the TileLayer._set() to get rid of the parameters stripping action when setting the URL. i.e.

TileLayer._set('url', 'map_server_url')

Using Proxy with ArcGIS JS

For servers without CORS enabled. We can use proxy mechanism to access the services.

This is done by modifying the proxy.ashx.

You can also add any parameters before sending the request to the actual server.

More references could be found at:

https://developers.arcgis.com/javascript/latest/guide/proxies/index.html

Windows file explorer cached hostname specified in hosts file

The 'hosts' file in Windows allows user to add hostname to IP entries. When you modify the entries in hosts, the file explorer might not reflect the changes immediately. This is because the mapping is already cached in the Workstation service.

Consider the following situation, you may hosts file with the following entry:

192.168.1.100   my_nas

Then you can use \\my_nas\share in the file explorer to view content in \\192.168.1.100\share. Next, you try to modify the entry as following:

192.168.1.101   my_nas

While the command ping my_nas tells you my_nas is now 192.168.1.101, but the file explorer cached the entry, hence \\my_nas\share still points to the old IP (i.e. 192.168.1.100).

To clear this cache, apart from rebooting the machine, user can consider to restart the "Workstation" service instead.

LineDashedMaterial in three.js

To use LineDashedMaterial in three.js:

var geometry = new THREE.Geometry();
geometry.vertices.push(new THREE.Vector3(590058.52, 231354.16, 766.42));
geometry.vertices.push(new THREE.Vector3(589941.68, 231476.67, 736.52));
geometry.vertices.push(new THREE.Vector3(589781.32, 231491.91, 757.73));
geometry.vertices.push(new THREE.Vector3(589711.88, 231445.56, 768.16));
geometry.vertices.push(new THREE.Vector3(589702.04, 231336.49, 772.91));
geometry.computeLineDistances();

let material = new THREE.LineDashedMaterial( {
    color: 0xff0000,
    linewidth: 1,
    scale: 1,
    dashSize: 5,
    gapSize: 3,
} );

let line = new THREE.Line(geometry, material);
scene.add(line);

Note: 

• You need to call geometry.computeLineDistances() to make the dash work
• computeLineDistances( ) only works with Geometry (Not work with BufferGeometry)
• The linewidth has no effect in Windows, it is always equals 1

Null safe expression in Thymeleaf

Using '?' after the variable in Thymeleaf expression, that variable will be null safe.

<td th:text="${user.department?.name}"></td>

For the avoid example, even variable department is null, the expression will still be fine.

OpenLayers blurry map with ArcGIS tiles

Check this out:

https://github.com/openlayers/openlayers/issues/6430

Skip testing in Maven

To skip the unit testing in Maven, we need to set the environment variable "maven.test.skip" to true. Or we can use "-DskipTests"

Sample command:

Prompt> mvn package -Dmaven.test.skip=true

OR

Prompt> mvn package -DskipTests

Reference:

https://www.mkyong.com/maven/how-to-skip-maven-unit-test/

Query windows patch via command line

To check if a windows patch (e.g. KB1234567) has been installed, run the following command line:

     C:> wmic qfe | find "1234567"

KVM with NKRO keyboard

Most KVM (e.g. ATEN CS62U) won't compatible with NKRO (N-Key Roll Over) keyboard (e.g. Most mechanical keyboard are with NKRO).

So please pay more attention when purchasing a KVM for NKRO keyboard.

git commands

There are some useful git commands:

Setup a repository:

     git init --bare

Copy an existing repository:

     git clone drive:

Add file to repository:

     git add file
     git commit
     git push

Get updated files from repository:

     git fetch

Merge updated files to my workspace:

     git merge