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LOAD-Synchronisation umgeschrieben #21

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merged 2 commits into from
Apr 7, 2024
Merged

LOAD-Synchronisation umgeschrieben #21

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5c8182e
Synchronisation des Load-Events umgeschrieben
denkspuren Apr 7, 2024
482acdb
Neue Synchronisation beim LOAD-Event
denkspuren Apr 7, 2024
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52 changes: 32 additions & 20 deletions lvp.java
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Original file line number Diff line number Diff line change
Expand Up @@ -6,22 +6,23 @@
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.function.Consumer;
import java.util.stream.Collectors;

import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpServer;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.Condition;

// To run this code type `jshell -R-ea --enable-preview`

enum SSEType { WRITE, CALL, SCRIPT, LOAD, CLEAR; }
Expand All @@ -31,16 +32,19 @@ class LiveView {
final int port;
static int defaultPort = 50_001;
static final String index = "./web/index.html";
static Map<Integer,LiveView> views = new HashMap<>();
static Map<Integer,LiveView> views = new ConcurrentHashMap<>();
List<String> paths = new ArrayList<>();

static void setDefaultPort(int port) { defaultPort = port != 0 ? Math.abs(port) : 50_001; }
static int getDefaultPort() { return defaultPort; }

List<HttpExchange> sseClientConnections;

// barrier required to temporarily block SSE event of type `SSEType.LOAD`
private final CyclicBarrier barrier = new CyclicBarrier(2);
// lock required to temporarily block processing of `SSEType.LOAD`
Lock lock = new ReentrantLock();
Condition loadEventOccurredCondition = lock.newCondition();
boolean loadEventOccured = false;


static LiveView onPort(int port) {
port = Math.abs(port);
Expand All @@ -64,18 +68,20 @@ private LiveView(int port) throws IOException {
server = HttpServer.create(new InetSocketAddress("localhost", port), 0);
System.out.println("Open http://localhost:" + port + " in your browser");

// loaded-Request to signal successful processing of SSEType.LOAD
server.createContext("/loaded", exchange -> {
if (!exchange.getRequestMethod().equalsIgnoreCase("post")) {
exchange.sendResponseHeaders(405, -1); // Method Not Allowed
return;
}
exchange.sendResponseHeaders(200, 0);
exchange.close();
try {
barrier.await(2L, TimeUnit.SECONDS);
} catch (InterruptedException | BrokenBarrierException | TimeoutException e) {
System.err.print(e);
System.exit(1);
lock.lock();
try { // try/finally pattern for locks
loadEventOccured = true;
loadEventOccurredCondition.signalAll();
} finally {
lock.unlock();
}
});

Expand Down Expand Up @@ -118,21 +124,27 @@ private LiveView(int port) throws IOException {
void sendServerEvent(SSEType sseType, String data) {
List<HttpExchange> deadConnections = new ArrayList<>();
for (HttpExchange connection : sseClientConnections) {
if (sseType == SSEType.LOAD) lock.lock();
try {
connection.getResponseBody()
.write(("data: " + (sseType + ":" + data).replaceAll("(\\r|\\n|\\r\\n)", "\\\\n") + "\n\n")
.getBytes(StandardCharsets.UTF_8));
connection.getResponseBody().flush();
if (sseType == SSEType.LOAD) {
try {
barrier.await(2L, TimeUnit.SECONDS);
} catch (InterruptedException | BrokenBarrierException | TimeoutException e) {
System.err.print(SSEType.LOAD + " missed confirmation: " + e);
deadConnections.add(connection); // connection is assumed to be dead
}
if (sseType == SSEType.LOAD && !loadEventOccured) {
loadEventOccurredCondition.await(2_000, TimeUnit.MILLISECONDS);
if (!loadEventOccured)
System.err.println("LOAD-Timeout: " + data);
// TODO: failed load i.e. <script>-Tag should be removed in index.html
}
} catch (IOException e) {
deadConnections.add(connection);
} catch (InterruptedException e) {
System.err.println("LOAD-Timeout: " + data + ", " + e);
} finally {
if (sseType == SSEType.LOAD) {
loadEventOccured = false;
lock.unlock();
}
}
}
sseClientConnections.removeAll(deadConnections);
Expand Down
4 changes: 1 addition & 3 deletions web/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -5,9 +5,7 @@
<meta charset="UTF-8">
<link href="web/favicon.ico" rel="icon" type="image/x-icon" />
<title>Clerk in Java Prototype</title>
<link rel="stylesheet" href="web/clerk.css">

<!-- <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js" defer></script> -->
<link rel="stylesheet" href="web/clerk.css">
<script src="web/script.js" defer></script>
</head>
<body>
Expand Down