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package com.oracle.graal.python.test.engine;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;

import org.graalvm.polyglot.Engine;
import org.graalvm.polyglot.Source;
import org.graalvm.polyglot.Value;
import org.junit.Assert;
import org.junit.Test;

public class SharedEngineMultithreadingSimpleLambdaTest extends SharedEngineMultithreadingTestBase {
    private static final int RUNS_COUNT = 2 * RUNS_COUNT_FACTOR;

    @Test
    public void testLambdaInParallelCtxCreatedInMainThread() throws InterruptedException, ExecutionException {
        ExecutorService executorService = createExecutorService();
        log("Running testLambdaInParallelCtxCreatedInMainThread");
        for (int runIndex = 0; runIndex < RUNS_COUNT; runIndex++) {
            // Note: for some reason we must create a fresh source for each run in order to
            // reproduce GR-30689
            Source code = Source.create("python", "lambda: 42");
            try (Engine engine = Engine.create()) {
                Task[] tasks = new Task[THREADS_COUNT];
                log("Iteration %d, submitting %d tasks...", runIndex, tasks.length);
                for (int i = 0; i < Runtime.getRuntime().availableProcessors(); i++) {
                    InitializedContext ctx = initContext(engine, new String[0]);
                    tasks[i] = () -> {
                        try {
                            Value result = ctx.context.eval(code).execute();
                            Assert.assertEquals(42, result.asInt());
                            StdStreams out = ctx.getStreamsOutput();
                            Assert.assertEquals("", out.out);
                            Assert.assertEquals("", out.err);
                        } finally {
                            ctx.close();
                        }
                        return null;
                    };
                }
                submitAndWaitAll(executorService, tasks);
            }
        }
    }

    @Test
    public void testLambdaInParallelCtxCreatedInWorkerThread() throws InterruptedException, ExecutionException {
        ExecutorService executorService = createExecutorService();
        log("Running testLambdaInParallelCtxCreatedInMainThread");
        for (int runIndex = 0; runIndex < RUNS_COUNT; runIndex++) {
            Source code = Source.create("python", "lambda: 42");
            try (Engine engine = Engine.create()) {
                Task[] tasks = new Task[THREADS_COUNT];
                log("Iteration %d, submitting %d tasks...", runIndex, tasks.length);
                for (int i = 0; i < Runtime.getRuntime().availableProcessors(); i++) {
                    tasks[i] = () -> {
                        try (InitializedContext ctx = initContext(engine, new String[0])) {
                            Value result = ctx.context.eval(code).execute();
                            Assert.assertEquals(42, result.asInt());
                            StdStreams out = ctx.getStreamsOutput();
                            Assert.assertEquals("", out.out);
                            Assert.assertEquals("", out.err);
                        }
                        return null;
                    };
                }
                submitAndWaitAll(executorService, tasks);
            }
        }
    }

    @Test
    public void testLambdaInParallelSharedContexts() throws InterruptedException, ExecutionException {
        ExecutorService executorService = createExecutorService();
        log("Running testLambdaInParallelCtxCreatedInMainThread");
        for (int runIndex = 0; runIndex < RUNS_COUNT; runIndex++) {
            Source code = Source.create("python", "lambda: 42");
            try (Engine engine = Engine.create()) {
                InitializedContext[] contexts = new InitializedContext[]{
                                initContext(engine, new String[0]),
                                initContext(engine, new String[0]),
                                initContext(engine, new String[0])
                };
                Task[] tasks = new Task[THREADS_COUNT];
                log("Iteration %d, submitting %d tasks...", runIndex, tasks.length);
                try {
                    for (int i = 0; i < Runtime.getRuntime().availableProcessors(); i++) {
                        tasks[i] = () -> {
                            try (InitializedContext ctx = initContext(engine, new String[0])) {
                                Value result = ctx.context.eval(code).execute();
                                Assert.assertEquals(42, result.asInt());
                                StdStreams out = ctx.getStreamsOutput();
                                Assert.assertEquals("", out.out);
                                Assert.assertEquals("", out.err);
                            }
                            return null;
                        };
                    }
                    submitAndWaitAll(executorService, tasks);
                } finally {
                    for (InitializedContext ctx : contexts) {
                        ctx.close();
                    }
                }
            }
        }
    }
}
