njbartlett

module Main where

import Control.Monad
import Data.List

type Line = [Int]

data Wire = Wire { start :: Int
                 , end   :: Int } deriving Show

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countCrossings :: TestCase -> Int
countCrossings = length . guardedPairs crosses

-- This is the "pairs" function from the first meeting, with the addition of a
-- predicate function to filter out unwanted pairs
guardedPairs :: (a -> a -> Bool) -> [a] -> [(a,a)]
guardedPairs p xs = [(x,y) | (x:ys) <- tails xs, y <- ys, p x y]

crosses :: Wire -> Wire -> Bool
crosses (Wire s1 e1) (Wire s2 e2) = if s1 < s2 then e1 > e2 else e1 < e2

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-- Find the longest shared prefix of two lists
-- e.g. findPrefix [1,2,3,4] [1,2,3,5] returns [1,2,3]
findPrefix :: (Eq a) => [a] -> [a] -> [a]
findPrefix xs = map fst . takeWhile (uncurry (==)) . zip xs

njbartlett

package org.example.api;

public interface Greeting {
    String sayHello(String name);
}

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package org.example.impl;

import org.example.api.Greeting;
import aQute.bnd.annotation.component.Component;

@Component
public class BasicGreeting implements Greeting {
    public String sayHello(String name) {
        return "Hello " + name;
    }

njbartlett

package org.example.impl;

import junit.framework.TestCase;

public class BasicGreetingTest extends TestCase {
    public void testHello() {
        assertEquals("Hello Fred", new BasicGreeting().sayHello("Fred"));
    }
}

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package org.example.gui;

import java.awt.Container;
import java.awt.Dimension;
import java.awt.event.*;
import javax.swing.*;
import org.example.api.Greeting;
import aQute.bnd.annotation.component.*;

@Component

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@Reference(type = '?')
public void setLog(LogService log) {
    // ...
}
	
public void unsetLog(LogService log) {
    // ...
}

@Reference(type = '*')

njbartlett

osgi> 2011-10-18 11:28:36
Full thread dump Java HotSpot(TM) Client VM (14.3-b01 mixed mode):
 
"[ThreadPool Manager] - Idle Thread" daemon prio=6 tid=0x35668c00 nid=0x1688 in Object.wait() [0x3715f000]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x07220be8> (a org.eclipse.equinox.internal.util.impl.tpt.threadpool.Executor)
        at java.lang.Object.wait(Object.java:485)
        at org.eclipse.equinox.internal.util.impl.tpt.threadpool.Executor.run(Executor.java:106)
        - locked <0x07220be8> (a org.eclipse.equinox.internal.util.impl.tpt.threadpool.Executor)

njbartlett

public class ExampleBundleTest extends TestCase {

    private final BundleContext context = FrameworkUtil.getBundle(ExampleBundleTest.class).getBundleContext();

    public void testServiceAvailable() {
        // Tests that a specific service exists and can be invoked successfully.
        // The service reference is released automatically.
        try (ServiceConsumer<MyService> svc = new ServiceConsumer<>(MyService.class, context)) {
            assertEquals("Hello Neil", svc.get().sayHello("Neil"));
        }