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Groovy example source code file (ClosureAsParamTest.groovy)

This example Groovy source code file (ClosureAsParamTest.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

callable, callable, closureasparamtest, closureasparamtest, groovytestcase, groovytestcase, threading, threads

The Groovy ClosureAsParamTest.groovy source code

/*
 * Copyright 2003-2010 the original author or authors.
 *
 * 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 groovy

import java.util.concurrent.Callable

/**
 * Tests calling methods with Closures as parameters.
 *
 * @author <a href="mailto:james@coredevelopers.net">James Strachan
 * @author Paul King
 * @version $Revision: 20481 $
 */
class ClosureAsParamTest extends GroovyTestCase {

    int x

    void testSimpleBlockCall() {
        assert 'hello!' == assertClosure({ owner -> owner })
    }

    void testRunnable() {
        x = 0
        assertRunnable({ x = 1 })
        assert x == 1
    }

    void testCallable() {
        x = 0
        assert 'Callable' == assertCallable({ x = 2; 'Callable' })
        assert x == 2
    }

    void testRunnablePreferred() {
        x = 0
        assertRunnableAndCallable({ x = 3; 'result' })
        assert x == 6
    }

    void testCallableCoercion() {
        x = 0
        assert 'result' == assertRunnableAndCallable({ x = 3; 'result' } as Callable)
        assert x == 9
    }

    def assertClosure(Closure block) {
        assert block != null
        block.call("hello!")
    }

    def assertRunnable(Runnable r) {
        r.run()
    }

    def assertCallable(Callable c) {
        c.call()
    }

    def assertRunnableAndCallable(Runnable r) {
        r.run()
        x *= 2
    }

    def assertRunnableAndCallable(Callable c) {
        def result = c.call()
        x *= 3
        result
    }

}

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