Here we have a method that allows us to determine return parameter type using templates and operator overloading in C++. This is something that I needed for a project that I am working on where a method call would give me the expected type based on the return type. Usage There is two way of …
While serializing ByteBuffer using Kryo we will run into the following issue. Class cannot be created (missing no-arg constructor): java.nio.HeapByteBuffer To fix this we can create a custom serializer that will take a ByteBuffer and serialize it to and from Kryo. Serializer is rather simple all we need is two pieces of data, length of …
Kryo (missing no-arg constructor): java.nio.HeapByteBuffer Read More »
Our EventEmitter in PhantomSQL is based on NodeJS version so they should be compatible. Here are couple examples on how to use the emitter. Basic usage of registering and listening to an event. "use strict"; const {EventEmitter} = require(’events’); // Dump all the args em.on(’hello-event’, (…arg)=> {console.info("Hello event handler : " + arg)}); …
Example with Chromium Embedded Framework (CEF) on how to create an object in C++ and make it accessible via Javascript. console.inof(api) Object {ready: true, version: "psql.0.0.1", info: Object, getVersion: function}console.inof(api) Object {ready: true, version: "psql.0.0.1", info: Object, getVersion: function} void ExtractEngineApp::OnContextCreated( CefRefPtr<CefBrowser> browser, CefRefPtr<CefFrame> frame, CefRefPtr<CefV8Context> context) { auto info = CefV8Value::CreateObject(NULL, NULL); info->SetValue("major", …
Creating Javascript accessible object from C++ / CEF Read More »
nohup egrep -rnw ‘=\s112’ –include=*.java ./ 2>&1 | tee ~/112-audit-nick.txt
Here we will create Data retrieval service with exponential backoff that we covered in the previous post. Implementation package com.rms.blueprint.data; import java.util.Date; import java.util.Objects; import java.util.concurrent.TimeUnit; import java.util.function.Function; import java.util.function.ObjLongConsumer; import java.util.function.Supplier; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class DataRetrievalWithBackoff implements Runnable { public final Logger LOGGER = LoggerFactory.getLogger(DataRetrievalWithBackoff.class); private final …
In a variety of computer networks, binary exponential backoff or truncated binary exponential backoff refers to an algorithm used to space out repeated retransmissions of the same block of data, often as part of network congestion avoidance. Wikipedia Exponential backoff Here is an implementation in Java /** * Calculate Exponential backoff * * @param attempt …
Since the beginning of this project, I have learned many lessons. First of all the syntax of the language was to closely related to SQL, as this was the language that I wanted to mimic and fit into this framework. Main reason for that was that I wanted something familiar to the end user, I …
Couple snippets that allow us to run checksum and get unique md5 checksums. This is two step process. First, we obtain our md5 checksum for all files find -type f -exec md5sum "{}" + > /opt/checklist.chkfind -type f -exec md5sum "{}" + > /opt/checklist.chk This produces file with following contents 71cc452a8ac5a27c32a83e6a0909e7ae ./PID_190_7344_0_47710322.tif6712032974632727465.tiff 71cc452a8ac5a27c32a83e6a0909e7ae ./PID_190_7344_0_47710322.tif174464329785828524.tiff 71cc452a8ac5a27c32a83e6a0909e7ae …
Run MD5 check sum against all files in a directory Read More »
This is a small utility class that allows us to obtain a random number between two values that are uniformly distributed in the range of ‘low’ to ‘high’. This works for floats, doubles and integers. The inner working of this class are straight forward, our uniform(int, int) method uses the nextInt(int) method of Random class …
