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<title>WebSocketFrame (flash-parent 2.1.0-SNAPSHOT API)</title>
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<div class="header">
<div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">dev.relism.flash.websocket</a></div>
<h1 title="Class WebSocketFrame" class="title">Class WebSocketFrame</h1>
</div>
<div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a>
<div class="inheritance">dev.relism.flash.websocket.WebSocketFrame</div>
</div>
<section class="class-description" id="class-description">
<hr>
<div class="type-signature"><span class="modifiers">public final class </span><span class="element-name type-name-label">WebSocketFrame</span>
<span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></span></div>
<div class="block">Zero-copy view over <a href="WebSocketSession.html" title="class in dev.relism.flash.websocket"><code>WebSocketSession</code></a>'s read buffer.
One instance allocated per connection, reset per frame — zero steady-state allocation.
<p><b>Lifetime contract:</b> valid ONLY within the synchronous scope of
<a href="WebSocketHandler.html#onMessage(dev.relism.flash.websocket.WebSocketSession,dev.relism.flash.websocket.WebSocketFrame)"><code>WebSocketHandler.onMessage(WebSocketSession, WebSocketFrame)</code></a>.
The underlying buffer is owned by <a href="WebSocketSession.html" title="class in dev.relism.flash.websocket"><code>WebSocketSession</code></a> and will be
overwritten on the next frame read. Never retain a reference beyond the
callback; use <a href="#copyPayload()"><code>copyPayload()</code></a> when data must outlive the call.
<p><b>Debug safety:</b> <code>buffer()</code> is package-private to prevent
accidental cross-boundary access. External consumers must go through
<a href="#copyPayload()"><code>copyPayload()</code></a> or process in-place within the callback.</div>
</section>
<section class="summary">
<ul class="summary-list">
<!-- =========== FIELD SUMMARY =========== -->
<li>
<section class="field-summary" id="field-summary">
<h2>Field Summary</h2>
<div class="caption"><span>Fields</span></div>
<div class="summary-table three-column-summary">
<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Field</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color"><code>static final byte</code></div>
<div class="col-second even-row-color"><code><a href="#OP_BINARY" class="member-name-link">OP_BINARY</a></code></div>
<div class="col-last even-row-color">&nbsp;</div>
<div class="col-first odd-row-color"><code>static final byte</code></div>
<div class="col-second odd-row-color"><code><a href="#OP_CLOSE" class="member-name-link">OP_CLOSE</a></code></div>
<div class="col-last odd-row-color">&nbsp;</div>
<div class="col-first even-row-color"><code>static final byte</code></div>
<div class="col-second even-row-color"><code><a href="#OP_CONTINUATION" class="member-name-link">OP_CONTINUATION</a></code></div>
<div class="col-last even-row-color">&nbsp;</div>
<div class="col-first odd-row-color"><code>static final byte</code></div>
<div class="col-second odd-row-color"><code><a href="#OP_PING" class="member-name-link">OP_PING</a></code></div>
<div class="col-last odd-row-color">&nbsp;</div>
<div class="col-first even-row-color"><code>static final byte</code></div>
<div class="col-second even-row-color"><code><a href="#OP_PONG" class="member-name-link">OP_PONG</a></code></div>
<div class="col-last even-row-color">&nbsp;</div>
<div class="col-first odd-row-color"><code>static final byte</code></div>
<div class="col-second odd-row-color"><code><a href="#OP_TEXT" class="member-name-link">OP_TEXT</a></code></div>
<div class="col-last odd-row-color">&nbsp;</div>
</div>
</section>
</li>
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
<li>
<section class="constructor-summary" id="constructor-summary">
<h2>Constructor Summary</h2>
<div class="caption"><span>Constructors</span></div>
<div class="summary-table two-column-summary">
<div class="table-header col-first">Constructor</div>
<div class="table-header col-last">Description</div>
<div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E()" class="member-name-link">WebSocketFrame</a>()</code></div>
<div class="col-last even-row-color">&nbsp;</div>
</div>
</section>
</li>
<!-- ========== METHOD SUMMARY =========== -->
<li>
<section class="method-summary" id="method-summary">
<h2>Method Summary</h2>
<div id="method-summary-table">
<div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div>
<div id="method-summary-table.tabpanel" role="tabpanel" aria-labelledby="method-summary-table-tab0">
<div class="summary-table three-column-summary">
<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Method</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>byte[]</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#copyPayload()" class="member-name-link">copyPayload</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Copies the payload into a fresh array.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>int</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#generation()" class="member-name-link">generation</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Returns the generation counter at the moment of this call.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#isFin()" class="member-name-link">isFin</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>byte</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#opcode()" class="member-name-link">opcode</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>int</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#payloadLength()" class="member-name-link">payloadLength</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>int</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#payloadOffset()" class="member-name-link">payloadOffset</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3>
<code><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div>
</section>
</li>
</ul>
</section>
<section class="details">
<ul class="details-list">
<!-- ============ FIELD DETAIL =========== -->
<li>
<section class="field-details" id="field-detail">
<h2>Field Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="OP_CONTINUATION">
<h3>OP_CONTINUATION</h3>
<div class="member-signature"><span class="modifiers">public static final</span>&nbsp;<span class="return-type">byte</span>&nbsp;<span class="element-name">OP_CONTINUATION</span></div>
<dl class="notes">
<dt>See Also:</dt>
<dd>
<ul class="tag-list">
<li><a href="../../../../constant-values.html#dev.relism.flash.websocket.WebSocketFrame.OP_CONTINUATION">Constant Field Values</a></li>
</ul>
</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="OP_TEXT">
<h3>OP_TEXT</h3>
<div class="member-signature"><span class="modifiers">public static final</span>&nbsp;<span class="return-type">byte</span>&nbsp;<span class="element-name">OP_TEXT</span></div>
<dl class="notes">
<dt>See Also:</dt>
<dd>
<ul class="tag-list">
<li><a href="../../../../constant-values.html#dev.relism.flash.websocket.WebSocketFrame.OP_TEXT">Constant Field Values</a></li>
</ul>
</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="OP_BINARY">
<h3>OP_BINARY</h3>
<div class="member-signature"><span class="modifiers">public static final</span>&nbsp;<span class="return-type">byte</span>&nbsp;<span class="element-name">OP_BINARY</span></div>
<dl class="notes">
<dt>See Also:</dt>
<dd>
<ul class="tag-list">
<li><a href="../../../../constant-values.html#dev.relism.flash.websocket.WebSocketFrame.OP_BINARY">Constant Field Values</a></li>
</ul>
</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="OP_CLOSE">
<h3>OP_CLOSE</h3>
<div class="member-signature"><span class="modifiers">public static final</span>&nbsp;<span class="return-type">byte</span>&nbsp;<span class="element-name">OP_CLOSE</span></div>
<dl class="notes">
<dt>See Also:</dt>
<dd>
<ul class="tag-list">
<li><a href="../../../../constant-values.html#dev.relism.flash.websocket.WebSocketFrame.OP_CLOSE">Constant Field Values</a></li>
</ul>
</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="OP_PING">
<h3>OP_PING</h3>
<div class="member-signature"><span class="modifiers">public static final</span>&nbsp;<span class="return-type">byte</span>&nbsp;<span class="element-name">OP_PING</span></div>
<dl class="notes">
<dt>See Also:</dt>
<dd>
<ul class="tag-list">
<li><a href="../../../../constant-values.html#dev.relism.flash.websocket.WebSocketFrame.OP_PING">Constant Field Values</a></li>
</ul>
</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="OP_PONG">
<h3>OP_PONG</h3>
<div class="member-signature"><span class="modifiers">public static final</span>&nbsp;<span class="return-type">byte</span>&nbsp;<span class="element-name">OP_PONG</span></div>
<dl class="notes">
<dt>See Also:</dt>
<dd>
<ul class="tag-list">
<li><a href="../../../../constant-values.html#dev.relism.flash.websocket.WebSocketFrame.OP_PONG">Constant Field Values</a></li>
</ul>
</dd>
</dl>
</section>
</li>
</ul>
</section>
</li>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<li>
<section class="constructor-details" id="constructor-detail">
<h2>Constructor Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="&lt;init&gt;()">
<h3>WebSocketFrame</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">WebSocketFrame</span>()</div>
</section>
</li>
</ul>
</section>
</li>
<!-- ============ METHOD DETAIL ========== -->
<li>
<section class="method-details" id="method-detail">
<h2>Method Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="opcode()">
<h3>opcode</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">byte</span>&nbsp;<span class="element-name">opcode</span>()</div>
</section>
</li>
<li>
<section class="detail" id="isFin()">
<h3>isFin</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name">isFin</span>()</div>
</section>
</li>
<li>
<section class="detail" id="payloadOffset()">
<h3>payloadOffset</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">int</span>&nbsp;<span class="element-name">payloadOffset</span>()</div>
</section>
</li>
<li>
<section class="detail" id="payloadLength()">
<h3>payloadLength</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">int</span>&nbsp;<span class="element-name">payloadLength</span>()</div>
</section>
</li>
<li>
<section class="detail" id="generation()">
<h3>generation</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">int</span>&nbsp;<span class="element-name">generation</span>()</div>
<div class="block">Returns the generation counter at the moment of this call.
Store it at callback entry and compare later to detect stale retention:
<pre><code>
int gen = frame.generation();
executor.submit(() -&gt; {
assert frame.generation() == gen : "frame buffer was recycled!";
});
</code></pre></div>
</section>
</li>
<li>
<section class="detail" id="copyPayload()">
<h3>copyPayload</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">byte[]</span>&nbsp;<span class="element-name">copyPayload</span>()</div>
<div class="block">Copies the payload into a fresh array. Allocates — O(n) in payload size.
Use only when data must outlive the <code>onMessage</code> callback or be
handed off to another thread. For payloads &gt; a few KB consider wrapping
the result in a pooled <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/nio/ByteBuffer.html" title="class or interface in java.nio" class="external-link"><code>ByteBuffer</code></a> to avoid GC pressure.</div>
</section>
</li>
</ul>
</section>
</li>
</ul>
</section>
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