Technology Experiments

2018-03-18T22:33:00.000-04:00

yo angular inside folder.

npm install --save-dev karma jasmine karma-jasmine karma-firefox-launcher grunt-cli grunt-karma

Protractor issue:

If you are on Mac:

brew upgrade selenium-server-standalone
brew upgrade chromedriver

if the above two are not installed:

brew install selenium-server-standalone
brew install chromedriver

npm install chromedriver
webdriver-manager update
webdriver-manager start

protractor conf.js

fatal error: 'openssl/ssl.h' file not found on Mac

2016-07-18T09:20:00.003-04:00

Correcting the problem -

First make sure Command Line tools are already installed.

xcode-select --install

xcode-select: error: command line tools are already installed, use "Software Update" to install updates

using Brew to update openssl -

sudo brew update

sudo brew install openssl

sudo brew link --force openssl

Adding curl library in C project in Xcode

2016-07-17T12:57:00.000-04:00

Steps:

1. Click over the project name in Xcode.

2. Go to "Build Phases" and expand "Link Binary with Libraries".

3. Click "+" sign and "Add Other".

4. Click "Shift" + "Command" + "G". This will launch a folder select dialogue.

5. Go to "/usr/lib" and then select "libcurl.dylib".

Setting System properties using ADB and accessing in #android code

2016-05-13T11:41:00.001-04:00

ADB command to set system properties-

adb shell setprop test.android.Sysprop Sandeep

Android code:

try {

Class clazz = Class.forName("android.os.SystemProperties");

//Parameters Types
@SuppressWarnings("rawtypes")
Class[] paramTypes = new Class[1];
paramTypes[0] = String.class;
Method get = clazz.getMethod("get", paramTypes);

//Parameters
Object[] params = new Object[1];
params[0] = "test.android.Sysprop";
String ret = (String) get.invoke(clazz, params);
Log.i(TAG,"ret:"+ret);
}catch(Exception e){
Log.e(TAG,e.getMessage(),e);
}

Remove .idea or some not needed files from remote

2015-12-17T11:22:00.002-05:00

git rm -r --cached .idea

git rm -r --cached

git commit -m "Removing not necessary files"

git push origin

To create an empty branch from master - local and remote

2015-12-17T08:32:00.001-05:00

git checkout --orphan EmptyBranch

git rm -rf .

git commit --allow-empty -m "initial commit"

git push -u origin EmptyBranch

Clash of Gradle classes for different versionsin #Android Studio - inactive functions

2015-12-11T15:11:00.001-05:00

If your gradle path in Project Properties is pointing to one version of gradle like gradle 2.4

And the gradle wrapper file, gradle-wrapper.properties
in gradle/wrapper folder

distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-2.8-all.zip

there will be clash.

Result- You will not be able to see active gradle function links in build.gradle.

buildscript {
repositories {
jcenter()
}
dependencies {

classpath 'com.android.tools.build:gradle:1.3.0'
classpath 'org.robolectric:robolectric-gradle-plugin:0.14.+'
classpath 'com.jakewharton.hugo:hugo-plugin:1.1.0'
}
}

If you Press Command+ Mouse Over on "buildscript" in build.gradle, you will not see an active link.

Some Flume Configurations

2015-12-10T19:58:00.000-05:00

FLUME_LOG_DIR=/var/log/flume-ng
FLUME_CONF_DIR=/etc/flume-ng/conf_${FLUME_AGENT_NAME}
FLUME_RUN_DIR=/var/run/flume-ng
FLUME_HOME=/usr/lib/flume-ng

Starting flume in background
nohup flume-ng agent -n CollectionFlume -c conf -f conf/flume-conf.properties > /dev/null 2>&1 &

or better

"nohup /opt/cloudera/parcels/CDH/lib/flume-ng/bin/flume-ng agent -c /opt/cloudera/parcels/CDH/lib/flume-ng/conf -f /opt/cloudera/parcels/CDH/lib/flume-ng/conf/flume-conf.properties -n agent >/dev/null 2>&1 "

Process

ps auxwww|grep -i 'flume-ng'

Helllo World In #Erlang on Mac

2015-09-29T02:10:00.001-04:00

Store

-module(hello).
-export([hello_world/0]).
hello_world() -> io:fwrite("hello, world\n").

in a hello.erl file. You can use Sublime as an editor.
[hello_world/0] means function hello_world with zero argument.

Compile the file

erl -compile hello

Open the Erlang Terminal

erl

You can also compile the program in terminal by
c(hello) compiles the file hello.erl

Run the program

hello:hello_world().

Output:

hello, world

To shut a system down cleanly, use init:stop().
Some quick ways are evaluating halt(). or control+\.
control+C a give you access to menus.

Installing #Erlang on mac

2015-09-29T02:03:00.000-04:00

brew install erlang

==> Installing dependencies for erlang: openssl, unixodbc, jpeg, libpng,

==> Installing erlang dependency: openssl

==> Downloading https://homebrew.bintray.com/bottles/openssl-1.0.2d_1.yosemite.b

######################################################################## 100.0%

==> Pouring openssl-1.0.2d_1.yosemite.bottle.tar.gz

==> Caveats

A CA file has been bootstrapped using certificates from the system

keychain. To add additional certificates, place .pem files in

/usr/local/etc/openssl/certs

and run

/usr/local/opt/openssl/bin/c_rehash

This formula is keg-only, which means it was not symlinked into /usr/local.

Apple has deprecated use of OpenSSL in favor of its own TLS and crypto libraries

Generally there are no consequences of this for you. If you build your

own software and it requires this formula, you'll need to add to your

build variables:

LDFLAGS: -L/usr/local/opt/openssl/lib

CPPFLAGS: -I/usr/local/opt/openssl/include

==> Summary

🍺 /usr/local/Cellar/openssl/1.0.2d_1: 464 files, 18M

==> Installing erlang dependency: unixodbc

==> Downloading https://homebrew.bintray.com/bottles/unixodbc-2.3.2_1.yosemite.b

######################################################################## 100.0%

==> Pouring unixodbc-2.3.2_1.yosemite.bottle.1.tar.gz

🍺 /usr/local/Cellar/unixodbc/2.3.2_1: 31 files, 1.0M

==> Installing erlang dependency: jpeg

==> Downloading https://homebrew.bintray.com/bottles/jpeg-8d.yosemite.bottle.2.t

######################################################################## 100.0%

==> Pouring jpeg-8d.yosemite.bottle.2.tar.gz

🍺 /usr/local/Cellar/jpeg/8d: 18 files, 776K

==> Installing erlang dependency: libpng

==> Downloading https://homebrew.bintray.com/bottles/libpng-1.6.18.yosemite.bott

######################################################################## 100.0%

==> Pouring libpng-1.6.18.yosemite.bottle.tar.gz

🍺 /usr/local/Cellar/libpng/1.6.18: 17 files, 1.2M

==> Installing erlang dependency: libtiff

==> Downloading https://homebrew.bintray.com/bottles/libtiff-4.0.6.yosemite.bott

######################################################################## 100.0%

==> Pouring libtiff-4.0.6.yosemite.bottle.tar.gz

🍺 /usr/local/Cellar/libtiff/4.0.6: 259 files, 3.9M

==> Installing erlang dependency: wxmac

==> Downloading https://homebrew.bintray.com/bottles/wxmac-3.0.2.yosemite.bottle

######################################################################## 100.0%

==> Pouring wxmac-3.0.2.yosemite.bottle.11.tar.gz

🍺 /usr/local/Cellar/wxmac/3.0.2: 777 files, 41M

==> Installing erlang

==> Downloading https://homebrew.bintray.com/bottles/erlang-18.1.yosemite.bottle

######################################################################## 100.0%

==> Pouring erlang-18.1.yosemite.bottle.tar.gz

==> Caveats

Man pages can be found in:

/usr/local/opt/erlang/lib/erlang/man

Access them with `erl -man`, or add this directory to MANPATH.

==> Summary

🍺 /usr/local/Cellar/erlang/18.1: 7465 files, 287M

Useful commands - ADB and other

2015-07-13T14:11:00.000-04:00

ADB commands:

To list sdk packages

android list sdk --all

android update sdk -u -a -t

logcat current package thread-

adb logcat | grep `adb shell ps | grep -E u0.*com.package.name | awk '{print $2}'`

print UID of app

adb shell dumpsys package com.sandeep.app | grep userId=

enable wifi -
adb shell svc wifi enable

command to kill an app from adb
adb shell ps | grep com.app.sandeep | awk '{print $2}' | xargs adb shell kill

version of app installed

adb shell dumpsys | grep -A18 "Package \[com.sandeep.packageName\]"

disable wifi -
adb shell svc wifi disable

if you are using volley in your application for http request

adb -s "deviceID" shell setprop log.tag.Volley VERBOSE

LCD density is in the build.prop:

adb shell getprop ro.sf.lcd_density

adb shell wm size
Physical size: 1080x1920

Launch settings -
adb shell am start -a android.intent.action.MAIN -n com.android.settings/.Settings

To find location of package in android
adb shell pm path

send intent

adb shell am broadcast -a -c --ei

specifications include these flags and arguments:

[-a ] [-d ] [-t ]

[-c [-c ] ...]

[-e|--es ...]

[--esn ...]

[--ez ...]

[--ei ...]

[--el ...]

[--ef ...]

[--eu ...]

[--ecn ]

[--eia [,

[--ela [,

[--efa [,

[--esa [,

(to embed a comma into a string escape it using "\,")

Different application manager commands:

am start [-D] [-W] [-P ] [--start-profiler ]

[--sampling INTERVAL] [-R COUNT] [-S] [--opengl-trace]

[--user | current]

am startservice [--user | current]

am stopservice [--user | current]

am force-stop [--user | all | current]

am kill [--user | all | current]

am kill-all

am broadcast [--user | all | current]

am instrument [-r] [-e ] [-p ] [-w]

[--user | current]

[--no-window-animation] [--abi ]

am profile start [--user current]

am profile stop [--user current] []

am dumpheap [--user current] [-n]

am set-debug-app [-w] [--persistent]

am clear-debug-app

am monitor [--gdb ]

am hang [--allow-restart]

am restart

am idle-maintenance

am screen-compat [on|off]

am to-uri [INTENT]

am to-intent-uri [INTENT]

am switch-user

am start-user

am stop-user

am stack start

am stack movetask [true|false]

am stack resize

am stack list

am stack info

am lock-task

am lock-task stop

am get-config

am start: start an Activity. Options are:

-D: enable debugging

-W: wait for launch to complete

--start-profiler : start profiler and send results to

--sampling INTERVAL: use sample profiling with INTERVAL microseconds

between samples (use with --start-profiler)

-P : like above, but profiling stops when app goes idle

-R: repeat the activity launch times. Prior to each repeat,

the top activity will be finished.

-S: force stop the target app before starting the activity

--opengl-trace: enable tracing of OpenGL functions

--user | current: Specify which user to run as; if not

specified then run as the current user.

am startservice: start a Service. Options are:

--user | current: Specify which user to run as; if not

specified then run as the current user.

am stopservice: stop a Service. Options are:

--user | current: Specify which user to run as; if not

specified then run as the current user.

am force-stop: force stop everything associated with .

--user | all | current: Specify user to force stop;

all users if not specified.

am kill: Kill all processes associated with . Only kills.

processes that are safe to kill -- that is, will not impact the user

experience.

--user | all | current: Specify user whose processes to kill;

all users if not specified.

am kill-all: Kill all background processes.

am broadcast: send a broadcast Intent. Options are:

--user | all | current: Specify which user to send to; if not

specified then send to all users.

--receiver-permission : Require receiver to hold permission.

am instrument: start an Instrumentation. Typically this target

is the form /. Options are:

-r: print raw results (otherwise decode REPORT_KEY_STREAMRESULT). Use with

[-e perf true] to generate raw output for performance measurements.

-e : set argument to . For test runners a

common form is [-e [,...]].

-p : write profiling data to

-w: wait for instrumentation to finish before returning. Required for

test runners.

--user | current: Specify user instrumentation runs in;

current user if not specified.

--no-window-animation: turn off window animations while running.

--abi : Launch the instrumented process with the selected ABI.

This assumes that the process supports the selected ABI.

am profile: start and stop profiler on a process. The given argument

may be either a process name or pid. Options are:

--user | current: When supplying a process name,

specify user of process to profile; uses current user if not specified.

am dumpheap: dump the heap of a process. The given argument may

be either a process name or pid. Options are:

-n: dump native heap instead of managed heap

--user | current: When supplying a process name,

specify user of process to dump; uses current user if not specified.

am set-debug-app: set application to debug. Options are:

-w: wait for debugger when application starts

--persistent: retain this value

am clear-debug-app: clear the previously set-debug-app.

am bug-report: request bug report generation; will launch UI

when done to select where it should be delivered.

am monitor: start monitoring for crashes or ANRs.

--gdb: start gdbserv on the given port at crash/ANR

am hang: hang the system.

--allow-restart: allow watchdog to perform normal system restart

am restart: restart the user-space system.

am idle-maintenance: perform idle maintenance now.

am screen-compat: control screen compatibility mode of .

am to-uri: print the given Intent specification as a URI.

am to-intent-uri: print the given Intent specification as an intent: URI.

am switch-user: switch to put USER_ID in the foreground, starting

execution of that user if it is currently stopped.

am start-user: start USER_ID in background if it is currently stopped,

use switch-user if you want to start the user in foreground.

am stop-user: stop execution of USER_ID, not allowing it to run any

code until a later explicit start or switch to it.

am stack start: start a new activity on using .

am stack movetask: move from its current stack to the top (true) or bottom (false) of .

am stack resize: change size and position to .

am stack list: list all of the activity stacks and their sizes.

am stack info: display the information about activity stack .

am lock-task: bring to the front and don't allow other tasks to run

am get-config: retrieve the configuration and any recent configurations

of the device

specifications include these flags and arguments:

[-a ] [-d ] [-t ]

[-c [-c ] ...]

[-e|--es ...]

[--esn ...]

[--ez ...]

[--ei ...]

[--el ...]

[--ef ...]

[--eu ...]

[--ecn ]

[--eia [,

[--ela [,

[--efa [,

[--esa [,

(to embed a comma into a string escape it using "\,")

[-n ] [-f ]

[--grant-read-uri-permission] [--grant-write-uri-permission]

[--grant-persistable-uri-permission] [--grant-prefix-uri-permission]

[--debug-log-resolution] [--exclude-stopped-packages]

[--include-stopped-packages]

[--activity-brought-to-front] [--activity-clear-top]

[--activity-clear-when-task-reset] [--activity-exclude-from-recents]

[--activity-launched-from-history] [--activity-multiple-task]

[--activity-no-animation] [--activity-no-history]

[--activity-no-user-action] [--activity-previous-is-top]

[--activity-reorder-to-front] [--activity-reset-task-if-needed]

[--activity-single-top] [--activity-clear-task]

[--activity-task-on-home]

[--receiver-registered-only] [--receiver-replace-pending]

[--selector]

[ | | ]

Location of java sdk on Mac:
ls /Library/Java/JavaVirtualMachines/

Installing #Oracle #Weblogic server on Mac

2015-07-09T04:56:00.002-04:00

Download Generic weblogic server installer from
http://www.oracle.com/technetwork/middleware/weblogic/downloads/

Installation command for downloaded jar -
java -d64 -Dspace.detection=false -Xmx1024m -jar fmw_12.1.3.0.0_wls.jar

For starter, select everything default.

Installed Domains-
ls ~/Oracle/Middleware/Oracle_Home/user_projects/domains/

Start the domain server-
cd /Users/sandeepshabd/Oracle/Middleware/Oracle_Home/user_projects/domains/wl_server
./startWebLogic.sh -Xrs

If Exception comes:

Caused By: java.net.UnknownHostException: hello: nodename nor servname provided, or not known

edit host file at /private/etc/ for all named localhost
127.0.0.1 hello

Also, remove any strange IP address, if present like
:::1 localhost

127.0.0.1 localhost is ok. DO not remove that.

If configurations has to be changed -

cd ~/Oracle/Middleware/Oracle_Home/wlserver/common/bin

./config.sh

Eclipse Preferences -> Server -> Installed Runtimes -> Add... -> Download additional server adapters
Once downloaded, select the adapter for the installed version of weblogic.

Server logs at

cd ~/Oracle/Middleware/Oracle_Home/user_projects/domains/wl_server/servers/AdminServer/logs

JMS and Advanced Queuing Protocol - Searched from Internet

2015-07-08T22:08:00.001-04:00

From Stackoverflow:

The Java Message Service (JMS) API is a Java Message Oriented Middleware (MOM) API for sending messages between two or more clients. JMS is a part of the Java Platform, Enterprise Edition, and is defined by a specification developed under the Java Community Process as JSR 914. It is a messaging standard that allows application components based on the Java Enterprise Edition (Java EE) to create, send, receive, and read messages. It allows the communication between different components of a distributed application to be loosely coupled, reliable, and asynchronous(From WIKI).
Now
The Advanced Message Queuing Protocol (AMQP)

is an open standard application layer protocol for message-oriented middleware. The defining features of AMQP are message orientation, queuing, routing (including point-to-point and publish-and-subscribe), reliability and security

And the most important thing

Unlike JMS, which merely defines an API, AMQP is a wire-level protocol. A wire-level protocol is a description of the format of the data that is sent across the network as a stream of octets. Consequently any tool that can create and interpret messages that conform to this data format can interoperate with any other compliant tool irrespective of implementation language

(From WIKI).

Some imp things you should know
1: Keep in mind that AMQP is a Messaging technologies that do not implement the JMS API.
2: JMS is API and AMQP is a protocol.So it doesn't make sense to say that what is default protocol of JMS , Ofcourse client applications use HTTP/S as the connection protocol when invoking a WebLogic Web Service.
3: JMS is only a API spec. It doesnt use any protocol. A JMS provider (like ActiveMQ) could be using any underlying protocol to realize the JMS API. For ex: Apache ActiveMQ can use any of the following protocols: AMQP, MQTT, OpenWire, REST(HTTP), RSS and Atom, Stomp, WSIF, WS Notification, XMPP

List of MQTT broker:
https://github.com/mqtt/mqtt.github.io/wiki/servers

(Extract from http://activemq.apache.org/weblogic-integration.html )

WebLogic 9.2 and above are known to support JMS 1.1. (I don't know what JMS release WebLogic 9.0-9.1 support)

To work with ActiveMQ in one of these release of WebLogic Server, you can use the J2EE Connector included with ActiveMQ (known as ActiveMQ-RA). This will provide full ActiveMQ support to J2EE applications – ActiveMQ can be used to both send messages and to deliver incoming messages to message-driven beans. Your J2EE applications can map connection factory and destination references in JNDI.

I don't have an example of using the J2EE Connector from a J2EE 1.4 application in WebLogic. If someone can contribute one that would be great!

If you're using Spring or another non-J2EE architecture in your application, you may choose to skip the J2EE Connector and just connect directly to ActiveMQ using the technique described in the next section.

On the surface it's not obvious why you might want to run an ActiveMQ broker within WebLogic instead of standalone, but the considerations include:

When ActiveMQ is run within WebLogic, it can be deployed, started, stopped, and redeployed like other applications, using the WebLogic console or other tools, while the JVM and WebLogic are still running
ActiveMQ can hook into the WebLogic JMX management system (as well as e.g. JRockit) to provide a single management interface to the app server, applications, ActiveMQ, and even the JVM.
ActiveMQ can leverage WebLogic security realms for authentication and authorization – not only are there more security realm types available for WebLogic, but they're also easier to configure via the WebLogic console

Using the ActiveMQ-RA J2EE Connector – ActiveMQ provides a J2EE Connector that is normally used by clients to connect to a separate ActiveMQ broker. However, the J2EE Connector accepts arguments to run an embedded broker and provide the location of an XML config file for an embedded broker. This is probably the best way to deploy an ActiveMQ broker in WebLogic Server, because ActiveMQ then has access to WebLogic thread pools and other resources.
Deploying an ActiveMQ Broker as a WebLogic Application – This is the technique described below for WebLogic Express. It works equally well in WebLogic Server.

ActiveMQ as a WebLogic Application

The easiest type of WebLogic application to configure with all the needed ActiveMQ libraries and configuration and not much else is a web application. The JARs go in WEB-INF/lib/ and config files typically in WEB-INF/. The only necessary configuration for the web application itself is to install a listener that will start and stop ActiveMQ when the web application is started and stopped. There are also a couple optional classes that can be used to integrate ActiveMQ with WebLogic's security system. Additionally, in this example, a simple web page included in the WAR will be available whenever ActiveMQ is running, so a simple HTTP request can determine whether the ActiveMQ module has been started.

Install #mosquitto on mac using #homebrew and related commands

2015-07-07T21:26:00.002-04:00

$ brew install mosquitto

==> Installing dependencies for mosquitto: c-ares, openssl, libwebsockets

==> Installing mosquitto dependency: c-ares

==> Downloading https://homebrew.bintray.com/bottles/c-ares-1.10.0.yosemite.bottle.tar.gz

######################################################################## 100.0%

==> Pouring c-ares-1.10.0.yosemite.bottle.tar.gz

🍺 /usr/local/Cellar/c-ares/1.10.0: 57 files, 540K

==> Installing mosquitto dependency: openssl

==> Downloading https://homebrew.bintray.com/bottles/openssl-1.0.2c.yosemite.bottle.tar.gz

######################################################################## 100.0%

==> Pouring openssl-1.0.2c.yosemite.bottle.tar.gz

==> Caveats

A CA file has been bootstrapped using certificates from the system

keychain. To add additional certificates, place .pem files in

/usr/local/etc/openssl/certs

and run

/usr/local/opt/openssl/bin/c_rehash

This formula is keg-only, which means it was not symlinked into /usr/local.

OS X already provides this software and installing another version in

parallel can cause all kinds of trouble.

Apple has deprecated use of OpenSSL in favor of its own TLS and crypto libraries

Generally there are no consequences of this for you. If you build your

own software and it requires this formula, you'll need to add to your

build variables:

LDFLAGS: -L/usr/local/opt/openssl/lib

CPPFLAGS: -I/usr/local/opt/openssl/include

==> Summary

🍺 /usr/local/Cellar/openssl/1.0.2c: 463 files, 18M

==> Installing mosquitto dependency: libwebsockets

==> Downloading https://homebrew.bintray.com/bottles/libwebsockets-1.4.yosemite.bottle.tar.gz

######################################################################## 100.0%

==> Pouring libwebsockets-1.4.yosemite.bottle.tar.gz

🍺 /usr/local/Cellar/libwebsockets/1.4: 23 files, 3.3M

==> Installing mosquitto

==> Downloading https://homebrew.bintray.com/bottles/mosquitto-1.4.2.yosemite.bottle.tar.gz

######################################################################## 100.0%

==> Pouring mosquitto-1.4.2.yosemite.bottle.tar.gz

==> Caveats

mosquitto has been installed with a default configuration file.

You can make changes to the configuration by editing:

/usr/local/etc/mosquitto/mosquitto.conf

To have launchd start mosquitto at login:

ln -sfv /usr/local/opt/mosquitto/*.plist ~/Library/LaunchAgents

Then to load mosquitto now:

launchctl load ~/Library/LaunchAgents/homebrew.mxcl.mosquitto.plist

Or, if you don't want/need launchctl, you can just run:

mosquitto -c /usr/local/etc/mosquitto/mosquitto.conf

==> Summary

🍺 /usr/local/Cellar/mosquitto/1.4.2: 28 files, 700K

To run Mosquitto:

/usr/local/sbin/mosquitto -c /usr/local/etc/mosquitto/mosquitto.conf

Installing mosquitto on ubuntu
sudo apt-get install mosquitto

In another tab Subscribe , with verbose and debug mode

mosquitto_sub -v -d -h localhost -t sandeep

In another tab Pusblish

mosquitto_pub -d -h localhost -t sandeep -m "Up and Running"

You will see subscribe received message

Up and Running

Running mosquitto process on port 1883

ps -ef | grep mosq && netstat -tln | grep 1883

client id - default name.hostname

mosquitto_sub [-1] [-A bind_address] [-c] [-d] [-h hostname] [-i client_id] [-I client id prefix] [-k keepalive time] [-p port number] [-q message QoS] [-R] [-S] [-N] [--quiet] [-v] [ [-u username] [-P password] ] [ --will-topic topic [--will-payload payload] [--will-qos qos] [--will-retain] ] [[ { --cafile file | --capath dir } [--certfile] [--key file] [--tls-version version] [--insecure] ] | [ --psk hex-key --psk-identity identity [--tls-version version] ]] [-T filter-out...] -t message-topic...

mosquitto_pub [-A bind_address] [-d] [-h hostname] [-i client_id] [-I client id prefix] [-p port number] [-q message QoS] [--quiet] [-r] [-S] { -f file | -l | -m message | -n | -s } [ [-u username] [-P password] ] [ --will-topic topic [--will-payload payload] [--will-qos qos] [--will-retain] ] [[ { --cafile file | --capath dir } [--cert file] [--key file] [--ciphers ciphers] [--tls-version version] [--insecure] ] | [ --psk hex-key --psk-identity identity [--ciphers ciphers] [--tls-version version] ]] -tmessage-topic

mosquitto_pub [--help]

Working with #Genymotion - Some tips

2015-06-29T17:46:00.005-04:00

Kill and Start Genymotion from terminal-
ps ax | grep "Player.app" | grep -v "grep" | xargs kill
VBoxManage list vms
/Applications/Genymotion.app/Contents/MacOS/player --vm-name

To access your localhost through Genymotion is using your mac IP address. To get your IP address type on Terminal - ifconfig

then search for IPv4, copy the IP and paste it in your URL.

For example

inet 192.168.1.81

It should looks like the following:

String exampleURL = "http://192.168.1.81:8080/....";

Git command

2015-06-22T10:40:00.002-04:00

to delete all branched other than master:

git branch | grep -v master | xargs git branch -D

to reset master:
git reset --hard origin/master

Working with Node.js server

2015-06-11T13:19:00.001-04:00

server.js

var http = require('http');
http.createServer(function (req, res) {
var body="";
req.on('data', function (chunk) {
body += chunk;
});
req.on('end', function () {
console.log('POSTed: ' + body);
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('success');
});

}).listen(1337, '127.0.0.1');
console.log('Server running at http://127.0.0.1:1337/');

node server.js start the server

-------------
Close the server

hello:tcps-service sandeepshabd$ ps aux | grep node

sandeepshabd 60569 0.0 0.0 2432772 672 s003 S+ 1:16PM 0:00.00 grep node

sandeepshabd 60542 0.0 0.2 3067496 20056 s001 S+ 1:11PM 0:00.18 node server.js

hello:tcps-service sandeepshabd$ kill -2 60542

Proguard change to remove only the log files from android app

2015-06-11T12:03:00.004-04:00

proguard-rules.pro

-dontwarn **
-target 1.7
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontpreverify
-verbose

-optimizations !code/simplification/arithmetic,!code/allocation/variable
-keep class **
-keepclassmembers class *{*;}
-keepattributes *

#This will not remove error log
-assumenosideeffects class android.util.Log {
#public static boolean isLoggable(java.lang.String, int);
public static int v(...);
public static int i(...);
public static int w(...);
public static int d(...);
#public static int e(...);
}

-----------------------------build.gradle ---------------------
buildTypes {

release {
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}

--------------------------------------

Heap size java commands

2015-05-06T12:12:00.000-04:00

To find java heap size

java -XX:+PrintFlagsFinal -version 2>&1 | grep MaxHeapSize


java -XX:+PrintFlagsFinal -version | grep -iE 'HeapSize|PermSize|ThreadStackSize'

    uintx AdaptivePermSizeWeight                    = 20              {product}           

     intx CompilerThreadStackSize                   = 0               {pd product}        

    uintx ErgoHeapSizeLimit                         = 0               {product}           

    uintx HeapSizePerGCThread                       = 87241520        {product}           

    uintx InitialHeapSize                          := 64749440        {product}           

    uintx LargePageHeapSizeThreshold                = 134217728       {product}           

    uintx MaxHeapSize                              := 1035993088      {product}           

    uintx MaxPermSize                               = 174063616       {pd product}        

    uintx PermSize                                  = 21757952        {pd product}        

     intx ThreadStackSize                           = 1024            {pd product}        

     intx VMThreadStackSize                         = 1024            {pd product}        
Bytes t0 MB

87241520/(1024*1024)

Working with #Sqlite database in #Android

2015-04-30T08:53:00.003-04:00

Log in into android Shell

adb root
adb remount
adb shell

Not in shell, cd to the folder where sql db is located at.

cd /data/user/0//databases/

Make sure you have the needed db

ls
example.db

Activate the sqlite commands

sqlite3 and ENTER

to see version of database

.headers on

PRAGMA user_version;

You will see sqlite tab now. Type following command to open the needed database.

sqlite> .open example.db

see the tables in the database

sqlite> .tables

table1 table2 table3

To see schema of table1

sqlite>.schema table1

CREATE TABLE table1 (_id INTEGER PRIMARY KEY, name TEXT NOT NULL, license TEXT NOT NULL);

to see contents of table
sqlite> select * from table1;

To see what all supported commands are there -

sqlite> .help

.backup ?DB? FILE Backup DB (default "main") to FILE

.bail on|off Stop after hitting an error. Default OFF

.clone NEWDB Clone data into NEWDB from the existing database

.databases List names and files of attached databases

.dump ?TABLE? ... Dump the database in an SQL text format

If TABLE specified, only dump tables matching

LIKE pattern TABLE.

.echo on|off Turn command echo on or off

.eqp on|off Enable or disable automatic EXPLAIN QUERY PLAN

.exit Exit this program

.explain ?on|off? Turn output mode suitable for EXPLAIN on or off.

With no args, it turns EXPLAIN on.

.fullschema Show schema and the content of sqlite_stat tables

.headers on|off Turn display of headers on or off

.help Show this message

.import FILE TABLE Import data from FILE into TABLE

.indices ?TABLE? Show names of all indices

If TABLE specified, only show indices for tables

matching LIKE pattern TABLE.

.log FILE|off Turn logging on or off. FILE can be stderr/stdout

.mode MODE ?TABLE? Set output mode where MODE is one of:

csv Comma-separated values

column Left-aligned columns. (See .width)

html HTML code

insert SQL insert statements for TABLE

line One value per line

list Values delimited by .separator string

tabs Tab-separated values

tcl TCL list elements

.nullvalue STRING Use STRING in place of NULL values

.once FILENAME Output for the next SQL command only to FILENAME

.open ?FILENAME? Close existing database and reopen FILENAME

.output ?FILENAME? Send output to FILENAME or stdout

.print STRING... Print literal STRING

.prompt MAIN CONTINUE Replace the standard prompts

.quit Exit this program

.read FILENAME Execute SQL in FILENAME

.restore ?DB? FILE Restore content of DB (default "main") from FILE

.save FILE Write in-memory database into FILE

.schema ?TABLE? Show the CREATE statements

If TABLE specified, only show tables matching

LIKE pattern TABLE.

.separator STRING ?NL? Change separator used by output mode and .import

NL is the end-of-line mark for CSV

.shell CMD ARGS... Run CMD ARGS... in a system shell

.show Show the current values for various settings

.stats on|off Turn stats on or off

.system CMD ARGS... Run CMD ARGS... in a system shell

.tables ?TABLE? List names of tables

If TABLE specified, only list tables matching

LIKE pattern TABLE.

.timeout MS Try opening locked tables for MS milliseconds

.timer on|off Turn SQL timer on or off

.trace FILE|off Output each SQL statement as it is run

.vfsname ?AUX? Print the name of the VFS stack

.width NUM1 NUM2 ... Set column widths for "column" mode

Negative values right-justify

MY SQL commands

2015-04-27T12:32:00.002-04:00

My SQL commands to keep safe update off

SET SQL_SAFE_UPDATES = 0;

Unix commands - maven and file listing

2015-04-22T23:23:00.003-04:00

Maven command to run java program

mvn exec:java -Dexec.mainClass="com.lochbridge.hadoop.NewCollectDriver" -Dexec.args="Sample.txt trips" -Dlog4j.configuration=log4j.properties

Unix command to find non-zero files created today

find -maxdepth 1 -size +0 -mtime -1

List files details

ls -al

ls -al file1 file2 file3

Merge multiple files

cat file1 file2 file3 >ResultFile

Setting Maven on Amazon Ubuntu Linux

2015-04-22T23:16:00.003-04:00

Download the compressed maven binary.

$ sudo wget ftp://apache.mirrors.pair.com/maven/maven-3/3.3.1/binaries/apache-maven-3.3.1-bin.tar.gz

If the link is old, get the latest link from maven site. Copy the link address, by selecting a proper mirror site.

Once you have proper link, the above command will download the compressed file.

$ ls

apache-maven-3.3.1-bin.tar.gz

$ sudo tar -xzvf apache-maven*

$sudo mv apache-maven-3.3.1 /usr/local/maven

$vi ~/.bashrc

type Esc , then i

Go to last line

add

export M2_HOME=/usr/local/maven

export MAVEN_HOME=/usr/local/maven

export M2=/usr/local/maven/bin

export PATH=${PATH}:$M2

then type following commands :

Esc

:wq!

This will exit the vi editor

$source ~/.bashrc

$mvn -version

You are all set. You will see following logs

Apache Maven 3.3.1

Maven home: /usr/local/maven

Fiiles/Folder related to Android Studio

2015-01-09T16:43:00.003-05:00

These folders may be helpful in debugging related to issues related to Android Studio.

~/Library/Application Support/AndroidStudio
~/Library/Caches/AndroidStudio
~/Library/Logs/AndroidStudio
~/Library/Preferences/AndroidStudio

Starting Android Game with libgdx

2014-11-23T19:18:00.000-05:00

I started with libgdx as a game engine to see how easy it to write code with. My initial impression is very good. The libgdx website gives you a jar to download. When you run the following command on the downloaded jar:

java -jar gdx-setup.jar --dir testGame --package --mainClass MyGame --sdkLocation

a UI is presented. I was able to select Android Studio as a my IDE, and was able to generate the project. It generates two modules - android and core. The android module has your application launcher. The core is where your game logic resides.

Once created, it comes with a default sample code. This displays a spooky bad logic icon on a red background. I was able to run the android module on emulator to see the result.

The following code was auto-generated by the jar. Once, you have this code base, you can use it to further extend your game logic.

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;

public class MyGdxGame extends ApplicationAdapter {
 SpriteBatch batch;
 Texture img;
 
 @Override
 public void create () {
  batch = new SpriteBatch();
  img = new Texture("badlogic.jpg");
 }

 @Override
 public void render () {
  Gdx.gl.glClearColor(1, 0, 0, 1);
  Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
  batch.begin();
  batch.draw(img, 0, 0);
  batch.end();
 }
}