Use both Java and C++ for cryptocurrency development

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·@iizuka·
0.000 HBD
Use both Java and C++ for cryptocurrency development
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<p><img src="https://steemitimages.com/DQmf1spPzfvNWuvTJBUHMm9Dx5DEnfiYhRymF9UQsAhdwH6/Screenshot%20from%202018-02-24%2022-41-18.png" width="616" height="295"/></p>
<p>Now making ASIC &amp; GPU resistant hash algorithm, which is yescript. And I decided to use JNI(Java Native Inerface) in calculating nonce.</p>
<p>Performance of nonce calculation is very severe issue to make all full nodes fair for fair coin distribution.</p>
<p>The demerit of using JNI is to make compiled Java binary incompatible for all OS platform. But full node is server software, so I'm going to specify OS and distribution.&nbsp;</p>
<h2>Why C++ is necessary</h2>
<p>I've told <a href="https://steemit.com/codablecash/@iizuka/development-environment-for-new-cryptocurrency">Java is good programming language</a> before. That's because maintain code is easy. But it has some weakpoints. There are two reasons to use C++.</p>
<h3>Java can't use pointer</h3>
<p>Java doesn't have pointer, so it have to make new object in order to implement following code.</p>
<ul>
  <li>Giving pointer of byte array to other variables</li>
  <li>Manipulating value on byte array</li>
</ul>
<p>Java has Bytefuffer class which can share byte array. But it makes more memory object on comparing with C and C++.</p>
<h3>Fastest implementation for fair distribution</h3>
<p>C++ is much faster than Java, on such codes which use pointer. Therefore if a full node user make codablecash server which uses C++ implementation, the person can calculate nonce much faster.</p>
<p>That means the full node can mine more blocks than others. It causes coin distribution problem.</p>
<p>Therefore I decided to use C++ code with JNI.</p>
<h2>Platform of full node server of Codecash</h2>
<p>At first, I'm going to make server software whose target is 64bit linux. I guess most of users will use cloud servers, like Digital Ocean and AWS.</p>
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