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 * Licensed to the Apache Software Foundation (ASF) under one                *
 * or more contributor license agreements.  See the NOTICE file              *
 * distributed with this work for additional information                     *
 * regarding copyright ownership.  The ASF licenses this file                *
 * to you 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                *
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 *     http://www.apache.org/licenses/LICENSE-2.0                            *
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 * software distributed under the License is distributed on an               *
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 * specific language governing permissions and limitations                   *
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/****************************************************************************/

package bsh;

import org.junit.Assert;
import org.junit.Test;

import java.util.concurrent.atomic.AtomicInteger;

public class InterpreterConcurrencyTest {

    static final String script =
            /*  1 */ "call(param) {" +
            /*  3 */ "	class Echo {\n" +
            /*  4 */ "		\n" +
            /*  5 */ "   	final Object _s;\n" +
            /*  6 */ "		\n" +
            /*  7 */ "   	Echo(Object s) {\n" +
            /*  8 */ "      	_s = s;\n" +
            /*  9 */ "   	}\n" +
            /*  0 */ "		\n" +
            /* 11 */ "   	Object echo() {\n" +
            /* 12 */ "      	return param;\n" +
            /* 13 */ "   	}\n" +
            /* 14 */ "		\n" +
            /* 15 */ "	}\n" +
            /* 16 */ "	\n" +
            /* 17 */ "	return new Echo(param).echo();\n" +
            /* 18 */ "}" +
            /* 19 */ "return this;";


    @Test
    public void single_threaded() throws Exception {
        final This callable = createCallable();
        Assert.assertEquals("foo", callable.invokeMethod("call", new Object[]{"foo"}));
        Assert.assertEquals(42, callable.invokeMethod("call", new Object[]{42}));
    }


    @Test
    public void multi_threaded_callable() throws Exception {
        final AtomicInteger counter = new AtomicInteger();
        final String script = "call(v) {" +
                "	return v;" +
                "}" +
                "return this;";
        final Interpreter interpreter = new Interpreter();
        final This callable = (This) interpreter.eval(script);
        final Runnable runnable = new Runnable() {
            public void run() {
                final int value = counter.incrementAndGet();
                try {
                    Assert.assertEquals(value, callable.invokeMethod("call", new Object[]{value}));
                } catch (final EvalError evalError) {
                    throw new RuntimeException(evalError);
                }
            }
        };
        TestUtil.measureConcurrentTime(runnable, 30, 30, 100);
    }


    @Test
    public void multi_threaded_class_generation() throws Exception {
        final This callable = createCallable();
        final AtomicInteger counter = new AtomicInteger();
        final Runnable runnable = new Runnable() {
            public void run() {
                try {
                    final int i = counter.incrementAndGet();
                    final Object o = callable.invokeMethod("call", new Object[]{i});
                    Assert.assertEquals(i, o);
                } catch (final EvalError evalError) {
                    throw new RuntimeException(evalError);
                }
            }
        };
        TestUtil.measureConcurrentTime(runnable, 30, 30, 100);
    }


    private This createCallable() throws EvalError {
        final Interpreter interpreter = new Interpreter();
        return (This) interpreter.eval(script);
    }

}
