#147 [vrtx] Introduce VertxAsyncRunner

requestor/ext/requestor-vertx/src/main/java/io/reinert/requestor/vertx/VertxAsyncRunner.java

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+/*
+ * Copyright 2023 Danilo Reinert
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.reinert.requestor.vertx;
+
+import io.reinert.requestor.core.AsyncRunner;
+import io.vertx.core.AsyncResult;
+import io.vertx.core.Vertx;
+
+/**
+ * AsyncRunner that integrates Requestor with Vertx.
+ *
+ * @author Danilo Reinert
+ */
+public class VertxAsyncRunner implements AsyncRunner {
+
+    public VertxAsyncRunner(Vertx vertx) {
+        this.vertx = vertx;
+    }
+    private final Vertx vertx;
+
+    @Override
+    public void run(Runnable runnable, long delayMillis) {
+        if (delayMillis < 1) {
+            executeBlocking(runnable);
+        } else {
+            vertx.setTimer(delayMillis, ignored -> executeBlocking(runnable));
+        }
+    }
+
+    @Override
+    public void sleep(long millis) {
+        try {
+            Thread.sleep(millis);
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private void executeBlocking(Runnable runnable) {
+        vertx.executeBlocking(promise -> {
+            runnable.run();
+            promise.complete();
+        }, VertxAsyncRunner::ignore);
+    }
+
+    private static void ignore(AsyncResult<?> res) {
+        // no-op
+    }
+
+    @Override
+    public void shutdown() {
+        // no-op
+    }
+
+    @Override
+    public boolean isShutdown() {
+        return false;
+    }
+
+    @Override
+    public Lock getLock() {
+        return new Lock();
+    }
+
+    public static class Lock implements AsyncRunner.Lock {
+
+        private volatile boolean awaiting = false;
+
+        @Override
+        public synchronized void await(long timeout) throws InterruptedException {
+            awaiting = true;
+            wait(timeout);
+        }
+
+        @Override
+        public boolean isAwaiting() {
+            return awaiting;
+        }
+
+        @Override
+        public synchronized void signalAll() {
+            notifyAll();
+        }
+    }
+}

requestor/ext/requestor-vertx/src/test/java/io/reinert/requestor/vertx/VertxAsyncRunnerTest.java

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+/*
+ * Copyright 2023 Danilo Reinert
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.reinert.requestor.vertx;
+
+import io.reinert.requestor.core.RequestException;
+import io.reinert.requestor.core.Session;
+import io.reinert.requestor.java.net.Requestor;
+import io.vertx.core.Vertx;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * Tests for VertxAsyncRunner
+ */
+public class VertxAsyncRunnerTest {
+
+    @Test
+    public void testRunMethod() {
+        AtomicInteger counter = new AtomicInteger();
+
+        // Create a Vertx instance
+        Vertx vertx = Vertx.vertx();
+
+        // Create an instance of VertxAsyncRunner
+        VertxAsyncRunner asyncRunner = new VertxAsyncRunner(vertx);
+
+        // Define the delay in milliseconds
+        long delayMillis = 2000;
+
+        // Define the Runnable to be executed
+        // Perform the desired actions
+        Runnable runnable = counter::incrementAndGet;
+
+        // Execute the run method
+        asyncRunner.run(runnable, delayMillis);
+
+        // Sleep for a sufficient amount of time to allow the execution to complete
+        try {
+            Thread.sleep(delayMillis + 1000);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+
+        vertx.close();
+
+        Assert.assertEquals(1, counter.get());
+    }
+
+    @Test
+    public void testSessionRequest() throws RequestException {
+        AtomicInteger counter = new AtomicInteger();
+
+        Vertx vertx = Vertx.vertx();
+
+        // Integrates requestor to vertx engine
+        VertxAsyncRunner asyncRunner = new VertxAsyncRunner(vertx);
+
+        // Start a new session with vertx async runner
+        Session session = Requestor.newSession(asyncRunner);
+
+        session.get("https://httpbin.org/ip", String.class)
+                .onSuccess(counter::incrementAndGet)
+                .await(); // hold main thread until request is done
+
+        vertx.close();
+
+        Assert.assertEquals(1, counter.get());
+    }
+}