package com.battery.device.registry;
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import static org.junit.jupiter.api.Assertions.assertFalse;
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import static org.junit.jupiter.api.Assertions.assertSame;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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import static org.junit.jupiter.api.Assertions.assertNotSame;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import java.util.concurrent.Future;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.atomic.AtomicBoolean;
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import org.junit.jupiter.api.Test;
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import com.battery.device.api.DeviceAdapter;
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import com.battery.device.model.AdapterCapabilities;
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import com.battery.device.model.ChannelIdentity;
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import com.battery.device.model.DeviceControlCommand;
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class DeviceAdapterRegistryTest
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{
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@Test
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void synchronizesEnabledConfigurationWithoutRecreatingUnchangedAdapter()
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{
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RecordingFactory factory = new RecordingFactory();
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try (DeviceAdapterRegistry registry = new DeviceAdapterRegistry(List.of(factory)))
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{
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AdapterInstanceConfig config = config("127.0.0.1", true);
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registry.synchronize(config);
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DeviceAdapter first = registry.execute("lab-bts", adapter -> adapter);
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registry.synchronize(config);
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assertSame(first, registry.execute("lab-bts", adapter -> adapter));
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assertFalse(factory.adapters.get(0).closed.get());
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}
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}
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@Test
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void replacesChangedConfigurationAndClosesAdapterWhenDisabled()
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{
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RecordingFactory factory = new RecordingFactory();
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try (DeviceAdapterRegistry registry = new DeviceAdapterRegistry(List.of(factory)))
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{
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registry.synchronize(config("127.0.0.1", true));
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StubAdapter first = factory.adapters.get(0);
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registry.synchronize(config("127.0.0.2", true));
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assertTrue(first.closed.get());
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assertNotSame(first, registry.execute("lab-bts", adapter -> adapter));
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registry.synchronize(config("127.0.0.2", false));
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assertTrue(factory.adapters.get(1).closed.get());
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assertFalse(registry.contains("lab-bts"));
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assertThrows(AdapterRegistryException.class,
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() -> registry.execute("lab-bts", adapter -> adapter));
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}
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}
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@Test
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void serializesOperationsForTheSameAdapterInstance() throws Exception
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{
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RecordingFactory factory = new RecordingFactory();
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try (DeviceAdapterRegistry registry = new DeviceAdapterRegistry(List.of(factory)))
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{
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registry.synchronize(config("127.0.0.1", true));
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CountDownLatch firstEntered = new CountDownLatch(1);
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CountDownLatch releaseFirst = new CountDownLatch(1);
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CountDownLatch secondEntered = new CountDownLatch(1);
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ExecutorService executor = Executors.newFixedThreadPool(2);
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try
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{
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Future<?> first = executor.submit(() -> registry.execute("lab-bts", adapter -> {
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firstEntered.countDown();
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await(releaseFirst);
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return null;
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}));
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assertTrue(firstEntered.await(1, TimeUnit.SECONDS));
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Future<?> second = executor.submit(() -> registry.execute("lab-bts", adapter -> {
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secondEntered.countDown();
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return null;
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}));
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assertFalse(secondEntered.await(100, TimeUnit.MILLISECONDS));
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releaseFirst.countDown();
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first.get(1, TimeUnit.SECONDS);
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second.get(1, TimeUnit.SECONDS);
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assertTrue(secondEntered.await(1, TimeUnit.SECONDS));
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}
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finally
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{
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executor.shutdownNow();
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}
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}
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}
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@Test
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void configurationReplacementWaitsForRunningOperationBeforeClosingAdapter() throws Exception
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{
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RecordingFactory factory = new RecordingFactory();
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try (DeviceAdapterRegistry registry = new DeviceAdapterRegistry(List.of(factory)))
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{
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registry.synchronize(config("127.0.0.1", true));
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StubAdapter firstAdapter = factory.adapters.get(0);
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CountDownLatch operationEntered = new CountDownLatch(1);
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CountDownLatch releaseOperation = new CountDownLatch(1);
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CountDownLatch replacementStarted = new CountDownLatch(1);
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ExecutorService executor = Executors.newFixedThreadPool(2);
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try
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{
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Future<?> operation = executor.submit(() -> registry.execute("lab-bts", adapter -> {
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operationEntered.countDown();
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await(releaseOperation);
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return null;
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}));
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assertTrue(operationEntered.await(1, TimeUnit.SECONDS));
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Future<?> replacement = executor.submit(() -> {
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replacementStarted.countDown();
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registry.synchronize(config("127.0.0.2", true));
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});
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assertTrue(replacementStarted.await(1, TimeUnit.SECONDS));
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assertFalse(replacement.isDone());
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assertFalse(firstAdapter.closed.get());
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releaseOperation.countDown();
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operation.get(1, TimeUnit.SECONDS);
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replacement.get(1, TimeUnit.SECONDS);
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assertTrue(firstAdapter.closed.get());
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}
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finally
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{
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executor.shutdownNow();
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}
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}
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}
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private static void await(CountDownLatch latch)
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{
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try
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{
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if (!latch.await(1, TimeUnit.SECONDS)) throw new AssertionError("等待适配器测试信号超时");
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}
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catch (InterruptedException exception)
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{
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Thread.currentThread().interrupt();
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throw new AssertionError("等待适配器测试信号被中断", exception);
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}
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}
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private static AdapterInstanceConfig config(String host, boolean enabled)
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{
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return new AdapterInstanceConfig("lab-bts", "BTS", host, 502, 5000,
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"Asia/Hong_Kong", enabled, AdapterCapabilities.observeOnly());
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}
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private static final class RecordingFactory implements DeviceAdapterFactory
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{
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private final List<StubAdapter> adapters = new ArrayList<>();
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@Override
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public String adapterType()
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{
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return "BTS";
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}
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@Override
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public DeviceAdapter create(AdapterInstanceConfig config)
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{
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StubAdapter adapter = new StubAdapter(config.adapterCode());
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adapters.add(adapter);
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return adapter;
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}
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}
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private static final class StubAdapter implements DeviceAdapter
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{
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private final String code;
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private final AtomicBoolean closed = new AtomicBoolean();
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private StubAdapter(String code)
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{
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this.code = code;
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}
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@Override
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public String adapterCode()
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{
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return code;
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}
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@Override
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public AdapterCapabilities capabilities()
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{
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return AdapterCapabilities.observeOnly();
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}
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@Override
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public List<com.battery.device.model.DetectedChannel> discoverChannels()
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{
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return List.of();
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}
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@Override
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public java.util.Map<ChannelIdentity, com.battery.device.model.RealtimeSnapshot> inquire(
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java.util.Set<ChannelIdentity> channels)
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{
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return java.util.Map.of();
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}
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@Override
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public List<com.battery.device.model.HistoryAvailability> inquireHistory(
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java.util.Set<ChannelIdentity> channels)
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{
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return List.of();
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}
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@Override
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public com.battery.device.model.HistoryPage downloadHistory(ChannelIdentity channel,
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String btsTestId, long startPosition, int limit)
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{
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throw new UnsupportedOperationException();
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}
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@Override
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public void control(ChannelIdentity channel, DeviceControlCommand command)
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{
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throw new UnsupportedOperationException();
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}
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@Override
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public void close()
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{
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closed.set(true);
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}
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}
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}
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