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json_stream_processing.html
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<!DOCTYPE html><html lang="en-US"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width,height=device-height,initial-scale=1.0"><meta name="apple-mobile-web-app-capable" content="yes"><meta http-equiv="X-UA-Compatible" content="ie=edge"><meta property="og:type" content="website"><meta name="twitter:card" content="summary"><style>@media screen{body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container button{-webkit-tap-highlight-color:transparent;-webkit-appearance:none;appearance:none;background-color:transparent;border:0;color:inherit;cursor:pointer;font-size:inherit;opacity:.8;outline:none;padding:0;transition:opacity .2s linear}body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button:disabled,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button:disabled,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button:disabled,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container button:disabled{cursor:not-allowed;opacity:.15!important}body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button:hover,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button:hover,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button:hover,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container button:hover{opacity:1}body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button:hover:active,body[data-bespoke-view=next] 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/*!
* Marp default theme.
*
* @theme default
* @author Yuki Hattori
*
* @auto-scaling true
* @size 16:9 1280px 720px
* @size 4:3 960px 720px
*/div#p>svg>foreignObject>section{--color-prettylights-syntax-comment:#6e7781;--color-prettylights-syntax-constant:#0550ae;--color-prettylights-syntax-entity:#8250df;--color-prettylights-syntax-storage-modifier-import:#24292f;--color-prettylights-syntax-entity-tag:#116329;--color-prettylights-syntax-keyword:#cf222e;--color-prettylights-syntax-string:#0a3069;--color-prettylights-syntax-variable:#953800;--color-prettylights-syntax-brackethighlighter-unmatched:#82071e;--color-prettylights-syntax-invalid-illegal-text:#f6f8fa;--color-prettylights-syntax-invalid-illegal-bg:#82071e;--color-prettylights-syntax-carriage-return-text:#f6f8fa;--color-prettylights-syntax-carriage-return-bg:#cf222e;--color-prettylights-syntax-string-regexp:#116329;--color-prettylights-syntax-markup-list:#3b2300;--color-prettylights-syntax-markup-heading:#0550ae;--color-prettylights-syntax-markup-italic:#24292f;--color-prettylights-syntax-markup-bold:#24292f;--color-prettylights-syntax-markup-deleted-text:#82071e;--color-prettylights-syntax-markup-deleted-bg:#ffebe9;--color-prettylights-syntax-markup-inserted-text:#116329;--color-prettylights-syntax-markup-inserted-bg:#dafbe1;--color-prettylights-syntax-markup-changed-text:#953800;--color-prettylights-syntax-markup-changed-bg:#ffd8b5;--color-prettylights-syntax-markup-ignored-text:#eaeef2;--color-prettylights-syntax-markup-ignored-bg:#0550ae;--color-prettylights-syntax-meta-diff-range:#8250df;--color-prettylights-syntax-brackethighlighter-angle:#57606a;--color-prettylights-syntax-sublimelinter-gutter-mark:#8c959f;--color-prettylights-syntax-constant-other-reference-link:#0a3069;--color-fg-default:#24292f;--color-fg-muted:#57606a;--color-fg-subtle:#6e7781;--color-canvas-default:#fff;--color-canvas-subtle:#f6f8fa;--color-border-default:#d0d7de;--color-border-muted:#d8dee4;--color-neutral-muted:rgba(175,184,193,.2);--color-accent-fg:#0969da;--color-accent-emphasis:#0969da;--color-attention-subtle:#fff8c5;--color-danger-fg:#cf222e;color-scheme:light}div#p>svg>foreignObject>section:where(.invert){--color-prettylights-syntax-comment:#8b949e;--color-prettylights-syntax-constant:#79c0ff;--color-prettylights-syntax-entity:#d2a8ff;--color-prettylights-syntax-storage-modifier-import:#c9d1d9;--color-prettylights-syntax-entity-tag:#7ee787;--color-prettylights-syntax-keyword:#ff7b72;--color-prettylights-syntax-string:#a5d6ff;--color-prettylights-syntax-variable:#ffa657;--color-prettylights-syntax-brackethighlighter-unmatched:#f85149;--color-prettylights-syntax-invalid-illegal-text:#f0f6fc;--color-prettylights-syntax-invalid-illegal-bg:#8e1519;--color-prettylights-syntax-carriage-return-text:#f0f6fc;--color-prettylights-syntax-carriage-return-bg:#b62324;--color-prettylights-syntax-string-regexp:#7ee787;--color-prettylights-syntax-markup-list:#f2cc60;--color-prettylights-syntax-markup-heading:#1f6feb;--color-prettylights-syntax-markup-italic:#c9d1d9;--color-prettylights-syntax-markup-bold:#c9d1d9;--color-prettylights-syntax-markup-deleted-text:#ffdcd7;--color-prettylights-syntax-markup-deleted-bg:#67060c;--color-prettylights-syntax-markup-inserted-text:#aff5b4;--color-prettylights-syntax-markup-inserted-bg:#033a16;--color-prettylights-syntax-markup-changed-text:#ffdfb6;--color-prettylights-syntax-markup-changed-bg:#5a1e02;--color-prettylights-syntax-markup-ignored-text:#c9d1d9;--color-prettylights-syntax-markup-ignored-bg:#1158c7;--color-prettylights-syntax-meta-diff-range:#d2a8ff;--color-prettylights-syntax-brackethighlighter-angle:#8b949e;--color-prettylights-syntax-sublimelinter-gutter-mark:#484f58;--color-prettylights-syntax-constant-other-reference-link:#a5d6ff;--color-fg-default:#c9d1d9;--color-fg-muted:#8b949e;--color-fg-subtle:#484f58;--color-canvas-default:#0d1117;--color-canvas-subtle:#161b22;--color-border-default:#30363d;--color-border-muted:#21262d;--color-neutral-muted:hsla(215,8%,47%,.4);--color-accent-fg:#58a6ff;--color-accent-emphasis:#1f6feb;--color-attention-subtle:rgba(187,128,9,.15);--color-danger-fg:#f85149;color-scheme:dark}div#p>svg>foreignObject>section{-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;word-wrap:break-word;background-color:var(--color-canvas-default);color:var(--color-fg-default);font-family:-apple-system,BlinkMacSystemFont,Segoe 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:where(.hljs-bullet){color:var(--color-prettylights-syntax-markup-list)}div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-emphasis){color:var(--color-prettylights-syntax-markup-italic);font-style:italic}div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-strong){color:var(--color-prettylights-syntax-markup-bold);font-weight:700}div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-addition){background-color:var(--color-prettylights-syntax-markup-inserted-bg);color:var(--color-prettylights-syntax-markup-inserted-text)}div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-deletion){background-color:var(--color-prettylights-syntax-markup-deleted-bg);color:var(--color-prettylights-syntax-markup-deleted-text)}div#p>svg>foreignObject>section footer,div#p>svg>foreignObject>section header{color:var(--header-footer-color);font-size:18px;left:30px;margin:0;position:absolute}div#p>svg>foreignObject>section header{top:21px}div#p>svg>foreignObject>section footer{bottom:21px}div#p>svg>foreignObject>section{--h1-color:#246;--header-footer-color:hsla(0,0%,40%,.75);--heading-strong-color:#48c;--paginate-color:#777;align-items:stretch;display:flex;flex-flow:column nowrap;font-size:29px;height:720px;justify-content:center;padding:78.5px;width:1280px}div#p>svg>foreignObject>section{--marpit-root-font-size:29px}div#p>svg>foreignObject>section:where(.invert){--h1-color:#cee7ff;--header-footer-color:hsla(0,0%,60%,.75);--heading-strong-color:#7bf;--paginate-color:#999}div#p>svg>foreignObject>section>:last-child,div#p>svg>foreignObject>section[data-footer]>:nth-last-child(2){margin-bottom:0}div#p>svg>foreignObject>section>:first-child,div#p>svg>foreignObject>section>header:first-child+*{margin-top:0}div#p>svg>foreignObject>section:after{bottom:21px;color:var(--paginate-color);font-size:24px;padding:0;position:absolute;right:30px}div#p>svg>foreignObject>section:after{--marpit-root-font-size:24px}div#p>svg>foreignObject>section[data-color] :is(h1,marp-h1),div#p>svg>foreignObject>section[data-color] :is(h2,marp-h2),div#p>svg>foreignObject>section[data-color] :is(h3,marp-h3),div#p>svg>foreignObject>section[data-color] :is(h4,marp-h4),div#p>svg>foreignObject>section[data-color] :is(h5,marp-h5),div#p>svg>foreignObject>section[data-color] :is(h6,marp-h6){color:currentcolor}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]{columns:initial!important;display:block!important;padding:0!important}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]:after,div#p>svg>foreignObject>section[data-marpit-advanced-background=background]:before,div#p>svg>foreignObject>section[data-marpit-advanced-background=content]:after,div#p>svg>foreignObject>section[data-marpit-advanced-background=content]:before{display:none!important}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]{all:initial;display:flex;flex-direction:row;height:100%;overflow:hidden;width:100%}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container][data-marpit-advanced-background-direction=vertical]{flex-direction:column}div#p>svg>foreignObject>section[data-marpit-advanced-background=background][data-marpit-advanced-background-split]>div[data-marpit-advanced-background-container]{width:var(--marpit-advanced-background-split,50%)}div#p>svg>foreignObject>section[data-marpit-advanced-background=background][data-marpit-advanced-background-split=right]>div[data-marpit-advanced-background-container]{margin-left:calc(100% - var(--marpit-advanced-background-split, 50%))}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]>figure{all:initial;background-position:center;background-repeat:no-repeat;background-size:cover;flex:auto;margin:0}div#p>svg>foreignObject>section[data-marpit-advanced-background=content],div#p>svg>foreignObject>section[data-marpit-advanced-background=pseudo]{background:transparent!important}div#p>svg>foreignObject>section[data-marpit-advanced-background=pseudo],div#p>svg[data-marpit-svg]>foreignObject[data-marpit-advanced-background=pseudo]{pointer-events:none!important}div#p>svg>foreignObject>section[data-marpit-advanced-background-split]{width:100%;height:100%}</style></head><body><div class="bespoke-marp-osc"><button data-bespoke-marp-osc="prev" tabindex="-1" title="Previous slide">Previous slide</button><span data-bespoke-marp-osc="page"></span><button data-bespoke-marp-osc="next" tabindex="-1" title="Next slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button><button data-bespoke-marp-osc="presenter" tabindex="-1" title="Open presenter view (p)">Open presenter view</button></div><div id="p"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="1" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h1>JSON Stream Processing</h1>
<p>Original source is found at <a href="https://github.com/jbee/json-streama/blob/main/PRESENTATION.md">https://github.com/jbee/json-streama/blob/main/PRESENTATION.md</a></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="2" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>Stream-What?</h2>
<p>Here: about processing JSON input, for example a data import</p>
<p>Typical basic case:</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-json"><span class="hljs-punctuation">{</span>
<span class="hljs-attr">"header"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span>
<span class="hljs-attr">"id"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"xyz"</span><span class="hljs-punctuation">,</span>
<span class="hljs-attr">"name"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"collection"</span>
<span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span>
<span class="hljs-attr">"entries"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span><span class="hljs-punctuation">{</span>...<span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span>...<span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> ...<span class="hljs-punctuation">]</span>
<span class="hljs-punctuation">}</span>
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>Mapping vs. Streaming</h2>
<p>Mapping</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code>JSON => Objects => process(Objects)
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>Mapping vs. Streaming</h2>
<p>Streaming (or <em>stream processing</em>)</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code>JSON => process(JSON*)
</code></pre>
<p><code>*</code>: a access "wrapper" API that reads the input as they are processed</p>
<p>could also think of it as:</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code>JSON => new Wrapper(JSON) => process(Wrapper)
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5" data-marpit-fragments="13" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>Why Streaming? - Mapping Pros & Cons</h2>
<p><strong>Pros</strong>:</p>
<ul>
<li data-marpit-fragment="1">object graph as API
<ul>
<li data-marpit-fragment="2">familiar</li>
<li data-marpit-fragment="3">order does not matter</li>
<li data-marpit-fragment="4">navigate graph freely</li>
<li data-marpit-fragment="5">DTOs (high re-usability)</li>
<li data-marpit-fragment="6">straight forward (not very error-prone)</li>
<li data-marpit-fragment="7">easy(er) to maintain <img class="emoji" draggable="false" alt="😍" src="https://cdn.jsdelivr.net/gh/twitter/[email protected]/assets/svg/1f60d.svg" data-marp-twemoji=""/></li>
</ul>
</li>
<li data-marpit-fragment="8">well-supported in common libraries (e.g. jackson)
<ul>
<li data-marpit-fragment="9">usually easy to extend and customise the mapping</li>
</ul>
</li>
</ul>
<p><strong>Cons</strong>:</p>
<ul>
<li data-marpit-fragment="10">object graph
<ul>
<li data-marpit-fragment="11">larger JSON => larger graph => more memory => <code>OutOfMemoryError</code> <img class="emoji" draggable="false" alt="🥴" src="https://cdn.jsdelivr.net/gh/twitter/[email protected]/assets/svg/1f974.svg" data-marp-twemoji=""/></li>
<li data-marpit-fragment="12">slow(er) <img class="emoji" draggable="false" alt="😴" src="https://cdn.jsdelivr.net/gh/twitter/[email protected]/assets/svg/1f634.svg" data-marp-twemoji=""/></li>
<li data-marpit-fragment="13">needs guard against too large input</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6" data-marpit-fragments="11" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>Why Streaming? - Streaming Pros & Cons</h2>
<p><strong>Pros</strong>:</p>
<ul>
<li data-marpit-fragment="1">no intermediate representation
<ul>
<li data-marpit-fragment="2">can handle almost any size input (GB or even beyond) <img class="emoji" draggable="false" alt="😎" src="https://cdn.jsdelivr.net/gh/twitter/[email protected]/assets/svg/1f60e.svg" data-marp-twemoji=""/></li>
<li data-marpit-fragment="3">fast(er)</li>
<li data-marpit-fragment="4">no guard against large input required</li>
</ul>
</li>
</ul>
<p><strong>Cons</strong>:</p>
<ul>
<li data-marpit-fragment="5">usually library specific or hand-crafted API</li>
<li data-marpit-fragment="6">usually requires custom coded processing
<ul>
<li data-marpit-fragment="7">1-off solution (low re-usability)</li>
<li data-marpit-fragment="8">not straight forward (error-prone)</li>
<li data-marpit-fragment="9">hard(er) to maintain <img class="emoji" draggable="false" alt="🤯" src="https://cdn.jsdelivr.net/gh/twitter/[email protected]/assets/svg/1f92f.svg" data-marp-twemoji=""/></li>
</ul>
</li>
<li data-marpit-fragment="10">in streams order is significant by nature</li>
<li data-marpit-fragment="11">streams by nature are transient</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="7" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>Wouldn't it be nice to have the best of both worlds?</h2>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="8" data-marpit-fragments="6" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>What makes stream processing difficult?</h2>
<h4>1. Order Matters</h4>
<p><em>What we are used to</em>:</p>
<ul>
<li data-marpit-fragment="1">for JSON order of object members does not matter</li>
</ul>
<p><em>Reality</em>:</p>
<ul>
<li data-marpit-fragment="2">In streams order of object members matters</li>
<li data-marpit-fragment="3">(or the code gets very complicated and still only true for primitive members)</li>
</ul>
<h4>2. Transient Data</h4>
<p><em>What we are used to in OO</em>:</p>
<ul>
<li data-marpit-fragment="4">Data can be accessed at any time and does not change unless we do that change ourselves</li>
</ul>
<p><em>Reality</em>:</p>
<ul>
<li data-marpit-fragment="5">Stream values are only present at that point in the stream.</li>
<li data-marpit-fragment="6">Remembering previous values must be coded for each case.</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="9" data-marpit-fragments="7" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>Stream Processing JSON with Jackson</h2>
<p>For example: <a href="https://github.com/dhis2/dhis2-core/pull/9574/files">https://github.com/dhis2/dhis2-core/pull/9574/files</a></p>
<p>Jackson's "Wrapper" is <code>JsonParser</code></p>
<p><strong>Properties</strong>:</p>
<ul>
<li data-marpit-fragment="1">token based (object-start, object-end, ...)</li>
<li data-marpit-fragment="2">very low level</li>
<li data-marpit-fragment="3">quite error-prone</li>
<li data-marpit-fragment="4">quite hard to understand and maintain</li>
<li data-marpit-fragment="5">1-off solution per input JSON format</li>
<li data-marpit-fragment="6">order very important => difficult to code</li>
<li data-marpit-fragment="7">internal state tracking nightmare <img class="emoji" draggable="false" alt="😱" src="https://cdn.jsdelivr.net/gh/twitter/[email protected]/assets/svg/1f631.svg" data-marp-twemoji=""/></li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="10" data-marpit-fragments="2" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>Stream Processing JSON with Jackson II</h2>
<p>Pseudo code:</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-java"><span class="hljs-keyword">while</span> (parser.hasTokens()) {
<span class="hljs-type">String</span> <span class="hljs-variable">value</span> <span class="hljs-operator">=</span> <span class="hljs-literal">null</span>;
<span class="hljs-keyword">switch</span> (parser.nextToken()) {
<span class="hljs-keyword">case</span> OBJECT_START: <span class="hljs-comment">// what state are we in again?</span>
<span class="hljs-keyword">case</span> STRING: <span class="hljs-comment">// what state are we in again?</span>
value = parser.nextString();
}
<span class="hljs-comment">// what to do with the value now? </span>
<span class="hljs-comment">// and... what state are we in again?</span>
}
</code></pre>
<p>You have to wonder...</p>
<ul>
<li data-marpit-fragment="1"><strong>what is the state in the parser???</strong></li>
<li data-marpit-fragment="2"><strong>what is the state of the processing code variables???</strong></li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="11" data-marpit-fragments="11" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>Wouldn't it be nice...</h2>
<p>... to have best of both worlds?</p>
<h4>Wishlist</h4>
<ul>
<li data-marpit-fragment="1">fast</li>
<li data-marpit-fragment="2">low-footprint (memory, CPU)</li>
<li data-marpit-fragment="3">can handle large input</li>
<li data-marpit-fragment="4">easy to understand</li>
<li data-marpit-fragment="5">easy to use and extend</li>
<li data-marpit-fragment="6">re-usable "objects", composable</li>
<li data-marpit-fragment="7">"OO think" and Java types</li>
<li data-marpit-fragment="8">order is (mostly) irrelevant (in streams it is by nature)</li>
<li data-marpit-fragment="9">values are (more) stable (again, in streams the can't by nature)</li>
<li data-marpit-fragment="10">no internal and variable state tracking in our brains</li>
<li data-marpit-fragment="11">no JSON level concerns in our code => we want to deal with objects</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="12" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>1 ½ Magic Trick</h2>
<p>Fake it 'till you make it <img class="emoji" draggable="false" alt="😎" src="https://cdn.jsdelivr.net/gh/twitter/[email protected]/assets/svg/1f60e.svg" data-marp-twemoji=""/></p>
<p>Let's just pretend we have objects... use interfaces to model an object graph API:</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-java"><span class="hljs-keyword">interface</span> <span class="hljs-title class_">Payload</span> {
Header <span class="hljs-title function_">header</span><span class="hljs-params">()</span>;
Stream<Entry> <span class="hljs-title function_">entries</span><span class="hljs-params">()</span>;
}
<span class="hljs-keyword">interface</span> <span class="hljs-title class_">Header</span> {
String <span class="hljs-title function_">id</span><span class="hljs-params">()</span>;
String <span class="hljs-title function_">name</span><span class="hljs-params">()</span>;
}
<span class="hljs-keyword">interface</span> <span class="hljs-title class_">Entry</span> { <span class="hljs-comment">/* ... */</span> }
</code></pre>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-json"><span class="hljs-punctuation">{</span>
<span class="hljs-attr">"header"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span>
<span class="hljs-attr">"id"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"xyz"</span><span class="hljs-punctuation">,</span>
<span class="hljs-attr">"name"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"collection"</span>
<span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span>
<span class="hljs-attr">"entries"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span><span class="hljs-punctuation">{</span>...<span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span>...<span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> ...<span class="hljs-punctuation">]</span>
<span class="hljs-punctuation">}</span>
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="13" data-marpit-fragments="2" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>1 ½ Magic Trick II</h2>
<p>Usage:</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-java"><span class="hljs-type">Payload</span> <span class="hljs-variable">root</span> <span class="hljs-operator">=</span> JsonStream.ofRoot(Payload.class, inputStream);
<span class="hljs-type">Header</span> <span class="hljs-variable">header</span> <span class="hljs-operator">=</span> root.header();
root.entries().forEach(entry -> {
<span class="hljs-comment">//...</span>
});
</code></pre>
<ul>
<li data-marpit-fragment="1">1 "auto" implements using Java <code>Proxy</code></li>
<li data-marpit-fragment="2">½ order and reading is given/driven by usage (method calls on proxy API)</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="14" data-marpit-fragments="7" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>Yeah, but...</h2>
<ul>
<li data-marpit-fragment="1">can primitive fields be accessed in a random order? <strong>Yes</strong></li>
<li data-marpit-fragment="2">can there be multiple stream processed collections? <strong>Yes</strong></li>
<li data-marpit-fragment="3">can stream processing be nested? <strong>Yes</strong></li>
<li data-marpit-fragment="4">can the JSON contain members that are not "mapped"? <strong>Yes</strong></li>
<li data-marpit-fragment="5">can stream processing be applied to JSON arrays and object "maps"? <strong>Yes</strong></li>
<li data-marpit-fragment="6">can the root be an array or object "map"? <strong>Yes</strong></li>
<li data-marpit-fragment="7">can stream processed entries use other Java types than <code>Stream</code>? <strong>Yes</strong>, supported are:
<ul>
<li><code>Stream</code> (<code>Stream<Entry> entries()</code>)</li>
<li><code>Iterator</code> (<code>Iterator<Entry> entries()</code>)</li>
<li><code>Consumer</code> (<code>void entries(Consumer<Entry> forEachEntry)</code>)</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="15" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>Object "Maps" vs. Arrays</h2>
<p>Map-of-objects style:</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-json"><span class="hljs-punctuation">[</span><span class="hljs-punctuation">{</span> <span class="hljs-attr">"1"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span><span class="hljs-attr">"name"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"Track 1"</span><span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"2"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span><span class="hljs-attr">"name"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"Track 2"</span><span class="hljs-punctuation">}</span><span class="hljs-punctuation">}</span><span class="hljs-punctuation">]</span>
</code></pre>
<p>can be mapped directly to <code>Stream<Track></code>:</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-java"><span class="hljs-keyword">interface</span> <span class="hljs-title class_">Track</span> {
<span class="hljs-meta">@JsonProperty(key = true)</span>
<span class="hljs-type">int</span> <span class="hljs-title function_">no</span><span class="hljs-params">()</span>;
String <span class="hljs-title function_">name</span><span class="hljs-params">()</span>;
}
</code></pre>
<p>still, this array-of-objects style input will also work:</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-json"><span class="hljs-punctuation">[</span><span class="hljs-punctuation">{</span><span class="hljs-attr">"no"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">1</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"name"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"Track 1"</span><span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span><span class="hljs-attr">"no"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">2</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"name"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"Track 2"</span><span class="hljs-punctuation">}</span><span class="hljs-punctuation">]</span>
</code></pre>
<p>also a property named <code>key</code> does not require the annotation.</p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="16" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>Managing Expectations</h2>
<p>For example, tracks of a music album:</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-json"><span class="hljs-punctuation">{</span><span class="hljs-attr">"tracks"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span><span class="hljs-punctuation">{</span><span class="hljs-attr">"name"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"A"</span><span class="hljs-punctuation">}</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span><span class="hljs-attr">"name"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"B"</span><span class="hljs-punctuation">}</span><span class="hljs-punctuation">]</span><span class="hljs-punctuation">}</span>
</code></pre>
<p>Make properties mandatory using <code>required</code>:</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-java"><span class="hljs-keyword">interface</span> <span class="hljs-title class_">Track</span> {
<span class="hljs-meta">@JsonProperty(required = true)</span>
String <span class="hljs-title function_">name</span><span class="hljs-params">()</span>;
}
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="17" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>Managing Expectations II</h2>
<p>Restricting size using <code>minOccur</code> and <code>maxOccur</code>:</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-java"><span class="hljs-keyword">interface</span> <span class="hljs-title class_">Album</span> {
<span class="hljs-meta">@JsonProperty(minOccur = 1, maxOccur = 25)</span>
Stream<Track> <span class="hljs-title function_">tracks</span><span class="hljs-params">()</span>;
}
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="18" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>Or else...</h2>
<p>If a value is not in the JSON input, return a default</p>
<p>Simply give the "getter" a parameter of the return type:</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-java"><span class="hljs-keyword">interface</span> <span class="hljs-title class_">Track</span> {
String <span class="hljs-title function_">name</span><span class="hljs-params">(String defaultValue)</span>;
}
<span class="hljs-type">String</span> <span class="hljs-variable">name</span> <span class="hljs-operator">=</span> track.name(<span class="hljs-string">"unknown"</span>);
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="19" data-marpit-fragments="4" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>Next Level "Yeah, but..."</h2>
<ul>
<li data-marpit-fragment="1">is malformed JSON detected? <strong>Yes</strong>, => exception</li>
<li data-marpit-fragment="2">are accidental "out of order" usages of proxy objects detected? <strong>Yes</strong>, => exception</li>
<li data-marpit-fragment="3">are stream members out of order detected? <strong>Yes</strong>, => exception</li>
<li data-marpit-fragment="4">can the supported Java types be extended? <strong>Yes</strong> (WIP)</li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code>______ __
| _ \ / |
| | | |___ _ __ ___ ___ `| |
| | | / _ \ '_ ` _ \ / _ \ | |
| |/ / __/ | | | | | (_) | _| |_
|___/ \___|_| |_| |_|\___/ \___/
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="20" data-marpit-fragments="11" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>How are we doing?</h2>
<ul>
<li data-marpit-fragment="1">[x] fast</li>
<li data-marpit-fragment="2">[x] low-footprint (memory, CPU)</li>
<li data-marpit-fragment="3">[x] can handle large input</li>
<li data-marpit-fragment="4">[x] easy to understand</li>
<li data-marpit-fragment="5">[x] easy to use and extend</li>
<li data-marpit-fragment="6">[x] re-usable "objects", composable</li>
<li data-marpit-fragment="7">[x] "OO think" and Java types</li>
<li data-marpit-fragment="8">[x] order is (mostly) irrelevant (in streams it is by nature)</li>
<li data-marpit-fragment="9">[x] values are (more) stable (again, in streams the can't by nature)</li>
<li data-marpit-fragment="10">[x] no internal and variable state tracking in our brains</li>
<li data-marpit-fragment="11">[x] no JSON level concerns in our code => we want to deal with objects</li>
</ul>
<p>Noice!</p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="21" data-marpit-fragments="5" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>Implementation Notes</h2>
<ul>
<li data-marpit-fragment="1"><strong>Proxies</strong>: creates only one per member (independent of the number of items in a stream)</li>
<li data-marpit-fragment="2"><strong>Simple Values</strong>: are stored and accessed via index access in a reused array per member</li>
<li data-marpit-fragment="3"><strong>Parser</strong>:
<ul>
<li data-marpit-fragment="4">zero look ahead</li>
<li data-marpit-fragment="5">"self-suspending" PEG parser</li>
</ul>
</li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code>______ _____
| _ \ / __ \
| | | |___ _ __ ___ ___ `' / /'
| | | / _ \ '_ ` _ \ / _ \ / /
| |/ / __/ | | | | | (_) | ./ /___
|___/ \___|_| |_| |_|\___/ \_____/
</code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="22" data-marpit-fragments="4" data-class="invert" data-theme="default" data-heading-divider="2" class="invert" style="--class:invert;--theme:default;--heading-divider:2;">
<h2>Questions?</h2>
<p>Work in progress:</p>
<ul>
<li data-marpit-fragment="1"><code>IntStream</code>, <code>LongStream</code>, ...</li>
<li data-marpit-fragment="2"><code>Stream<String></code>, <code>Stream<Date></code>, ...</li>
<li data-marpit-fragment="3"><code>List<String></code>, <code>Map<String,Integer></code> ...</li>
<li data-marpit-fragment="4">manual skipping</li>
</ul>
</section>
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