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Push realtime data from the internal server to the webmap (#8)
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152 changes: 152 additions & 0 deletions
152
core/src/main/java/net/pl3x/map/core/httpd/LiveDataHandler.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,152 @@ | ||
| /* | ||
| * MIT License | ||
| * | ||
| * Copyright (c) 2020-2023 William Blake Galbreath | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| * of this software and associated documentation files (the "Software"), to deal | ||
| * in the Software without restriction, including without limitation the rights | ||
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| * copies of the Software, and to permit persons to whom the Software is | ||
| * furnished to do so, subject to the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be included in all | ||
| * copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| * SOFTWARE. | ||
| */ | ||
| package net.pl3x.map.core.httpd; | ||
|
|
||
| import io.undertow.Handlers; | ||
| import io.undertow.server.HttpServerExchange; | ||
| import io.undertow.server.handlers.sse.ServerSentEventConnection; | ||
| import io.undertow.server.handlers.sse.ServerSentEventHandler; | ||
| import java.io.IOException; | ||
| import org.jetbrains.annotations.NotNull; | ||
| import org.jetbrains.annotations.Nullable; | ||
|
|
||
| public class LiveDataHandler { | ||
| private ServerSentEventHandler serverSentEventHandler; | ||
|
|
||
| public LiveDataHandler() { | ||
| this.serverSentEventHandler = Handlers.serverSentEvents(); | ||
| } | ||
|
|
||
| /** | ||
| * | ||
| * @param event The message event | ||
| * @param data The message data | ||
| * @param success The callback that is called when a message is sucessfully sent. | ||
| * @param failure The callback that is called when a message send fails. | ||
| */ | ||
| public void send(String event, String data, SuccessCallback success, FailureCallback failure) { | ||
| if (serverSentEventHandler == null) { | ||
| return; | ||
| } | ||
|
|
||
| Callback callback = new Callback(success, failure); | ||
| for (ServerSentEventConnection connection : this.serverSentEventHandler.getConnections()) { | ||
| connection.send(data, event, null, callback); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * | ||
| * @param event The message event | ||
| * @param data The message data | ||
| * @param success The callback that is called when a message is sucessfully sent. | ||
| */ | ||
| public void send(String event, String data, SuccessCallback success) { | ||
| this.send(event, data, success, null); | ||
| } | ||
|
|
||
| /** | ||
| * | ||
| * @param event The message event | ||
| * @param data The message data | ||
| */ | ||
| public void send(String event, String data) { | ||
| this.send(event, data, null, null); | ||
| } | ||
|
|
||
| /** | ||
| * | ||
| * @param data The message data | ||
| */ | ||
| public void send(String data) { | ||
| this.send(null, data); | ||
| } | ||
|
|
||
| public void closeConnections() { | ||
| for (ServerSentEventConnection connection : serverSentEventHandler.getConnections()) { | ||
| connection.shutdown(); | ||
| } | ||
| } | ||
|
|
||
| public void handle(HttpServerExchange exchange) throws Exception { | ||
| this.serverSentEventHandler.handleRequest(exchange); | ||
| } | ||
|
|
||
| public ServerSentEventHandler get() { | ||
| return this.serverSentEventHandler; | ||
| } | ||
|
|
||
| /** | ||
| * Notification that is called when a message is sucessfully sent | ||
| */ | ||
| @FunctionalInterface | ||
| public interface SuccessCallback { | ||
| /** | ||
| * @param connection The connection | ||
| * @param data The message data | ||
| * @param event The message event | ||
| * @param id The message id | ||
| */ | ||
| void apply(@NotNull ServerSentEventConnection connection, @Nullable String data, @Nullable String event, @Nullable String id); | ||
| } | ||
|
|
||
| /** | ||
| * Notification that is called when a message send fails. | ||
| */ | ||
| @FunctionalInterface | ||
| public interface FailureCallback { | ||
| /** | ||
| * @param connection The connection | ||
| * @param data The message data | ||
| * @param event The message event | ||
| * @param id The message id | ||
| * @param exception The exception | ||
| */ | ||
| void apply(@NotNull ServerSentEventConnection connection, @Nullable String data, @Nullable String event, @Nullable String id, @NotNull IOException exception); | ||
| } | ||
|
|
||
| private class Callback implements ServerSentEventConnection.EventCallback { | ||
| private SuccessCallback success; | ||
| private FailureCallback failure; | ||
|
|
||
| public Callback(SuccessCallback success, FailureCallback failure) { | ||
| this.success = success; | ||
| this.failure = failure; | ||
| } | ||
|
|
||
| @Override | ||
| public void done(ServerSentEventConnection connection, String data, String event, String id) { | ||
| if (success != null) { | ||
| success.apply(connection, data, event, id); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public void failed(ServerSentEventConnection connection, String data, String event, String id, IOException e) { | ||
| if (failure != null) { | ||
| failure.apply(connection, data, event, id, e); | ||
| } | ||
| } | ||
| } | ||
| } |
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