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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.eclipse.jetty.websocket.core</a></div> |
| <h2 title="Interface FrameHandler" class="title">Interface FrameHandler</h2> |
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| <dl> |
| <dt>All Superinterfaces:</dt> |
| <dd><code><a href="IncomingFrames.html" title="interface in org.eclipse.jetty.websocket.core">IncomingFrames</a></code></dd> |
| </dl> |
| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><code><a href="../jakarta/common/JakartaWebSocketFrameHandler.html" title="class in org.eclipse.jetty.websocket.jakarta.common">JakartaWebSocketFrameHandler</a></code>, <code><a href="../common/JettyWebSocketFrameHandler.html" title="class in org.eclipse.jetty.websocket.common">JettyWebSocketFrameHandler</a></code>, <code><a href="internal/MessageHandler.html" title="class in org.eclipse.jetty.websocket.core.internal">MessageHandler</a></code></dd> |
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| <hr> |
| <pre>public interface <span class="typeNameLabel">FrameHandler</span> |
| extends <a href="IncomingFrames.html" title="interface in org.eclipse.jetty.websocket.core">IncomingFrames</a></pre> |
| <div class="block">Interface for local WebSocket Endpoint Frame handling. |
| |
| <p> |
| This is the receiver of Parsed Frames. It is implemented by the Application (or Application API layer or Framework) |
| as the primary API to/from the Core websocket implementation. The instance to be used for each websocket connection |
| is instantiated by the application, either: |
| </p> |
| <ul> |
| <li>On the server, the application layer must provide a <code>org.eclipse.jetty.websocket.core.server.WebSocketNegotiator</code> instance |
| to negotiate and accept websocket connections, which will return the FrameHandler instance to use from |
| <code>org.eclipse.jetty.websocket.core.server.WebSocketNegotiator#negotiate(Negotiation)</code>.</li> |
| <li>On the client, the application returns the FrameHandler instance to user from the <code>ClientUpgradeRequest</code> |
| instance that it passes to the <code>org.eclipse.jetty.websocket.core.client.WebSocketCoreClient#connect(ClientUpgradeRequest)</code> method/</li> |
| </ul> |
| <p> |
| Once instantiated the FrameHandler follows is used as follows: |
| </p> |
| <ul> |
| <li>The <a href="#onOpen(org.eclipse.jetty.websocket.core.CoreSession,org.eclipse.jetty.util.Callback)"><code>onOpen(CoreSession, Callback)</code></a> method is called when negotiation of the connection is completed. The passed <a href="CoreSession.html" title="interface in org.eclipse.jetty.websocket.core"><code>CoreSession</code></a> instance is used |
| to obtain information about the connection and to send frames</li> |
| <li>Every data and control frame received is passed to <a href="#onFrame(org.eclipse.jetty.websocket.core.Frame,org.eclipse.jetty.util.Callback)"><code>onFrame(Frame, Callback)</code></a>.</li> |
| <li>Received Control Frames that require a response (eg Ping, Close) are first passed to the <a href="#onFrame(org.eclipse.jetty.websocket.core.Frame,org.eclipse.jetty.util.Callback)"><code>onFrame(Frame, Callback)</code></a> to give the |
| Application an opportunity to send the response itself. If an appropriate response has not been sent when the callback passed is completed, then a |
| response will be generated.</li> |
| <li>If an error is detected or received, then <a href="#onError(java.lang.Throwable,org.eclipse.jetty.util.Callback)"><code>onError(Throwable, Callback)</code></a> will be called to inform the application of the cause of the problem. |
| The connection will then be closed or aborted and the <a href="#onClosed(org.eclipse.jetty.websocket.core.CloseStatus,org.eclipse.jetty.util.Callback)"><code>onClosed(CloseStatus, Callback)</code></a> method called.</li> |
| <li>The <a href="#onClosed(org.eclipse.jetty.websocket.core.CloseStatus,org.eclipse.jetty.util.Callback)"><code>onClosed(CloseStatus, Callback)</code></a> method is always called once a websocket connection is terminated, either gracefully or not. The error code |
| will indicate the nature of the close.</li> |
| </ul></div> |
| </li> |
| </ul> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span><span id="t5" class="tableTab"><span><a href="javascript:show(16);">Default Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>default boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isDemanding()">isDemanding</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Does the FrameHandler manage it's own demand?</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#onClosed(org.eclipse.jetty.websocket.core.CloseStatus,org.eclipse.jetty.util.Callback)">onClosed</a></span>​(<a href="CloseStatus.html" title="class in org.eclipse.jetty.websocket.core">CloseStatus</a> closeStatus, |
| <a href="../../util/Callback.html" title="interface in org.eclipse.jetty.util">Callback</a> callback)</code></th> |
| <td class="colLast"> |
| <div class="block">This is the Close Handshake Complete event.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#onError(java.lang.Throwable,org.eclipse.jetty.util.Callback)">onError</a></span>​(java.lang.Throwable cause, |
| <a href="../../util/Callback.html" title="interface in org.eclipse.jetty.util">Callback</a> callback)</code></th> |
| <td class="colLast"> |
| <div class="block">An error has occurred or been detected in websocket-core and being reported to FrameHandler.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#onFrame(org.eclipse.jetty.websocket.core.Frame,org.eclipse.jetty.util.Callback)">onFrame</a></span>​(<a href="Frame.html" title="class in org.eclipse.jetty.websocket.core">Frame</a> frame, |
| <a href="../../util/Callback.html" title="interface in org.eclipse.jetty.util">Callback</a> callback)</code></th> |
| <td class="colLast"> |
| <div class="block">Receiver of all Frames.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#onOpen(org.eclipse.jetty.websocket.core.CoreSession,org.eclipse.jetty.util.Callback)">onOpen</a></span>​(<a href="CoreSession.html" title="interface in org.eclipse.jetty.websocket.core">CoreSession</a> coreSession, |
| <a href="../../util/Callback.html" title="interface in org.eclipse.jetty.util">Callback</a> callback)</code></th> |
| <td class="colLast"> |
| <div class="block">Async notification that Connection is being opened.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </div> |
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| <!-- ============ METHOD DETAIL ========== --> |
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| <!-- --> |
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| <h3>Method Detail</h3> |
| <a id="onOpen(org.eclipse.jetty.websocket.core.CoreSession,org.eclipse.jetty.util.Callback)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
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| <h4>onOpen</h4> |
| <pre class="methodSignature">void onOpen​(<a href="CoreSession.html" title="interface in org.eclipse.jetty.websocket.core">CoreSession</a> coreSession, |
| <a href="../../util/Callback.html" title="interface in org.eclipse.jetty.util">Callback</a> callback)</pre> |
| <div class="block">Async notification that Connection is being opened. |
| <p> |
| FrameHandler can write during this call, but can not receive frames until the callback is succeeded. |
| </p> |
| <p> |
| If the FrameHandler succeeds the callback we transition to OPEN state and can now receive frames if |
| not demanding, or can now call <a href="CoreSession.html#demand(long)"><code>CoreSession.demand(long)</code></a> to receive frames if demanding. |
| If the FrameHandler fails the callback a close frame will be sent with <a href="CloseStatus.html#SERVER_ERROR"><code>CloseStatus.SERVER_ERROR</code></a> and |
| the connection will be closed. <br> |
| </p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>coreSession</code> - the session associated with this connection.</dd> |
| <dd><code>callback</code> - the callback to indicate success in processing (or failure)</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="onFrame(org.eclipse.jetty.websocket.core.Frame,org.eclipse.jetty.util.Callback)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>onFrame</h4> |
| <pre class="methodSignature">void onFrame​(<a href="Frame.html" title="class in org.eclipse.jetty.websocket.core">Frame</a> frame, |
| <a href="../../util/Callback.html" title="interface in org.eclipse.jetty.util">Callback</a> callback)</pre> |
| <div class="block">Receiver of all Frames. |
| This method will never be called in parallel for the same session and will be called |
| sequentially to satisfy all outstanding demand signaled by calls to |
| <a href="CoreSession.html#demand(long)"><code>CoreSession.demand(long)</code></a>. |
| Control and Data frames are passed to this method. |
| Close frames may be responded to by the handler, but if an appropriate close response is not |
| sent once the callback is succeeded, then a response close will be generated and sent.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="IncomingFrames.html#onFrame(org.eclipse.jetty.websocket.core.Frame,org.eclipse.jetty.util.Callback)">onFrame</a></code> in interface <code><a href="IncomingFrames.html" title="interface in org.eclipse.jetty.websocket.core">IncomingFrames</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>frame</code> - the raw frame</dd> |
| <dd><code>callback</code> - the callback to indicate success in processing frame (or failure)</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="onError(java.lang.Throwable,org.eclipse.jetty.util.Callback)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>onError</h4> |
| <pre class="methodSignature">void onError​(java.lang.Throwable cause, |
| <a href="../../util/Callback.html" title="interface in org.eclipse.jetty.util">Callback</a> callback)</pre> |
| <div class="block">An error has occurred or been detected in websocket-core and being reported to FrameHandler. |
| A call to onError will be followed by a call to <a href="#onClosed(org.eclipse.jetty.websocket.core.CloseStatus,org.eclipse.jetty.util.Callback)"><code>onClosed(CloseStatus, Callback)</code></a> giving the close status |
| derived from the error. This will not be called more than once, <a href="#onClosed(org.eclipse.jetty.websocket.core.CloseStatus,org.eclipse.jetty.util.Callback)"><code>onClosed(CloseStatus, Callback)</code></a> |
| will be called on the callback completion.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>cause</code> - the reason for the error</dd> |
| <dd><code>callback</code> - the callback to indicate success in processing (or failure)</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="onClosed(org.eclipse.jetty.websocket.core.CloseStatus,org.eclipse.jetty.util.Callback)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>onClosed</h4> |
| <pre class="methodSignature">void onClosed​(<a href="CloseStatus.html" title="class in org.eclipse.jetty.websocket.core">CloseStatus</a> closeStatus, |
| <a href="../../util/Callback.html" title="interface in org.eclipse.jetty.util">Callback</a> callback)</pre> |
| <div class="block">This is the Close Handshake Complete event. |
| <p> |
| The connection is now closed, no reading or writing is possible anymore. |
| Implementations of FrameHandler can cleanup their resources for this connection now. |
| This method will be called only once. |
| </p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>closeStatus</code> - the close status received from remote, or in the case of abnormal closure from local.</dd> |
| <dd><code>callback</code> - the callback to indicate success in processing (or failure)</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="isDemanding()"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>isDemanding</h4> |
| <pre class="methodSignature">default boolean isDemanding()</pre> |
| <div class="block">Does the FrameHandler manage it's own demand?</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true iff the FrameHandler will manage its own flow control by calling <a href="CoreSession.html#demand(long)"><code>CoreSession.demand(long)</code></a> when it |
| is willing to receive new Frames. Otherwise the demand will be managed by an automatic call to demand(1) after every |
| succeeded callback passed to <a href="#onFrame(org.eclipse.jetty.websocket.core.Frame,org.eclipse.jetty.util.Callback)"><code>onFrame(Frame, Callback)</code></a>.</dd> |
| </dl> |
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