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Instrumentation support for dataloader - better tests and added ChainedDataLoaderInstrumentation
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‎src/main/java/org/dataloader/instrumentation/ChainedDataLoaderInstrumentation.java

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package org.dataloader.instrumentation;
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import org.dataloader.BatchLoaderEnvironment;
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import org.dataloader.DataLoader;
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import org.dataloader.DispatchResult;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Objects;
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import java.util.function.Function;
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import java.util.stream.Collectors;
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/**
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* This {@link DataLoaderInstrumentation} can chain together multiple instrumentations and have them all called in
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* the order of the provided list.
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*/
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public class ChainedDataLoaderInstrumentation implements DataLoaderInstrumentation {
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private final List<DataLoaderInstrumentation> instrumentations;
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public ChainedDataLoaderInstrumentation() {
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instrumentations = List.of();
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}
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public ChainedDataLoaderInstrumentation(List<DataLoaderInstrumentation> instrumentations) {
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this.instrumentations = List.copyOf(instrumentations);
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}
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/**
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* Adds a new {@link DataLoaderInstrumentation} to the list and creates a new {@link ChainedDataLoaderInstrumentation}
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*
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* @param instrumentation the one to add
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* @return a new ChainedDataLoaderInstrumentation object
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*/
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public ChainedDataLoaderInstrumentation add(DataLoaderInstrumentation instrumentation) {
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ArrayList<DataLoaderInstrumentation> list = new ArrayList<>(instrumentations);
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list.add(instrumentation);
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return new ChainedDataLoaderInstrumentation(list);
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}
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@Override
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public DataLoaderInstrumentationContext<DispatchResult<?>> beginDispatch(DataLoader<?, ?> dataLoader) {
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return chainedCtx(it -> it.beginDispatch(dataLoader));
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}
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@Override
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public DataLoaderInstrumentationContext<List<?>> beginBatchLoader(DataLoader<?, ?> dataLoader, List<?> keys, BatchLoaderEnvironment environment) {
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return chainedCtx(it -> it.beginBatchLoader(dataLoader, keys, environment));
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}
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private <T> DataLoaderInstrumentationContext<T> chainedCtx(Function<DataLoaderInstrumentation, DataLoaderInstrumentationContext<T>> mapper) {
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// if we have zero or 1 instrumentations (and 1 is the most common), then we can avoid an object allocation
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// of the ChainedInstrumentationContext since it won't be needed
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if (instrumentations.isEmpty()) {
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return DataLoaderInstrumentationHelper.noOpCtx();
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}
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if (instrumentations.size() == 1) {
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return mapper.apply(instrumentations.get(0));
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}
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return new ChainedInstrumentationContext<>(dropNullContexts(mapper));
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}
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private <T> List<DataLoaderInstrumentationContext<T>> dropNullContexts(Function<DataLoaderInstrumentation, DataLoaderInstrumentationContext<T>> mapper) {
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return instrumentations.stream()
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.map(mapper)
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.filter(Objects::nonNull)
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.collect(Collectors.toList());
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}
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private static class ChainedInstrumentationContext<T> implements DataLoaderInstrumentationContext<T> {
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private final List<DataLoaderInstrumentationContext<T>> contexts;
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public ChainedInstrumentationContext(List<DataLoaderInstrumentationContext<T>> contexts) {
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this.contexts = contexts;
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}
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@Override
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public void onDispatched() {
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contexts.forEach(DataLoaderInstrumentationContext::onDispatched);
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}
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@Override
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public void onCompleted(T result, Throwable t) {
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contexts.forEach(it -> it.onCompleted(result, t));
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}
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}
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}

‎src/main/java/org/dataloader/instrumentation/DataLoaderInstrumentation.java

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*/
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public interface DataLoaderInstrumentation {
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/**
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* This call back is done just before the {@link DataLoader#dispatch()} is invoked
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* This call back is done just before the {@link DataLoader#dispatch()} is invoked,
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* and it completes when the dispatch call promise is done.
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*
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* @param dataLoader the {@link DataLoader} in question
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}
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/**
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* This call back is done just before the batch loader of a {@link DataLoader} is invoked. Remember a batch loader
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* This call back is done just before the `batch loader` of a {@link DataLoader} is invoked. Remember a batch loader
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* could be called multiple times during a dispatch event (because of max batch sizes)
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*
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* @param dataLoader the {@link DataLoader} in question

‎src/main/java/org/dataloader/instrumentation/DataLoaderInstrumentationContext.java

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*/
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public interface DataLoaderInstrumentationContext<T> {
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/**
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* This is invoked when the instrumentation step is initially dispatched
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* This is invoked when the instrumentation step is initially dispatched. Note this is NOT
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* the same time as the {@link DataLoaderInstrumentation}`beginXXX()` starts, but rather after all the inner
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* work has been done.
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*/
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default void onDispatched() {
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}
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/**
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* This is invoked when the instrumentation step is fully completed
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* This is invoked when the instrumentation step is fully completed.
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*
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* @param result the result of the step (which may be null)
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* @param t this exception will be non-null if an exception was thrown during the step

‎src/test/java/org/dataloader/fixtures/parameterized/TestDataLoaderFactory.java

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// Convenience methods
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default <K> DataLoader<K, K> idLoader(DataLoaderOptions options) {
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return idLoader(options, new ArrayList<>());
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}
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default <K> DataLoader<K, K> idLoader(List<Collection<K>> calls) {
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return idLoader(null, calls);
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}

‎src/test/java/org/dataloader/instrumentation/ChainedDataLoaderInstrumentationTest.java

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package org.dataloader.instrumentation;
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import org.dataloader.BatchLoaderEnvironment;
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import org.dataloader.DataLoader;
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import org.dataloader.DataLoaderFactory;
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import org.dataloader.DataLoaderOptions;
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import org.dataloader.DispatchResult;
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import org.dataloader.fixtures.TestKit;
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import org.dataloader.fixtures.parameterized.TestDataLoaderFactory;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.params.ParameterizedTest;
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import org.junit.jupiter.params.provider.MethodSource;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.concurrent.CompletableFuture;
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import static org.awaitility.Awaitility.await;
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import static org.dataloader.DataLoaderOptions.newOptions;
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import static org.hamcrest.MatcherAssert.assertThat;
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import static org.hamcrest.Matchers.equalTo;
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class ChainedDataLoaderInstrumentationTest {
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static class CapturingInstrumentation implements DataLoaderInstrumentation {
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String name;
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List<String> methods = new ArrayList<>();
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public CapturingInstrumentation(String name) {
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this.name = name;
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}
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@Override
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public DataLoaderInstrumentationContext<DispatchResult<?>> beginDispatch(DataLoader<?, ?> dataLoader) {
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methods.add(name + "_beginDispatch");
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return new DataLoaderInstrumentationContext<>() {
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@Override
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public void onDispatched() {
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methods.add(name + "_beginDispatch_onDispatched");
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}
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@Override
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public void onCompleted(DispatchResult<?> result, Throwable t) {
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methods.add(name + "_beginDispatch_onCompleted");
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}
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};
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}
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@Override
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public DataLoaderInstrumentationContext<List<?>> beginBatchLoader(DataLoader<?, ?> dataLoader, List<?> keys, BatchLoaderEnvironment environment) {
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methods.add(name + "_beginBatchLoader");
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return new DataLoaderInstrumentationContext<>() {
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@Override
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public void onDispatched() {
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methods.add(name + "_beginBatchLoader_onDispatched");
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}
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@Override
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public void onCompleted(List<?> result, Throwable t) {
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methods.add(name + "_beginBatchLoader_onCompleted");
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}
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};
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}
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}
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static class CapturingInstrumentationReturnsNull extends CapturingInstrumentation {
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public CapturingInstrumentationReturnsNull(String name) {
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super(name);
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}
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@Override
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public DataLoaderInstrumentationContext<DispatchResult<?>> beginDispatch(DataLoader<?, ?> dataLoader) {
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methods.add(name + "_beginDispatch");
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return null;
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}
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@Override
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public DataLoaderInstrumentationContext<List<?>> beginBatchLoader(DataLoader<?, ?> dataLoader, List<?> keys, BatchLoaderEnvironment environment) {
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methods.add(name + "_beginBatchLoader");
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return null;
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}
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}
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@Test
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void canChainTogetherZeroInstrumentation() {
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// just to prove its useless but harmless
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ChainedDataLoaderInstrumentation chainedItn = new ChainedDataLoaderInstrumentation();
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DataLoaderOptions options = newOptions().setInstrumentation(chainedItn);
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DataLoader<String, String> dl = DataLoaderFactory.newDataLoader(TestKit.keysAsValues(), options);
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dl.load("A");
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dl.load("B");
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CompletableFuture<List<String>> dispatch = dl.dispatch();
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await().until(dispatch::isDone);
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assertThat(dispatch.join(), equalTo(List.of("A", "B")));
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}
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@Test
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void canChainTogetherOneInstrumentation() {
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CapturingInstrumentation capturingA = new CapturingInstrumentation("A");
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ChainedDataLoaderInstrumentation chainedItn = new ChainedDataLoaderInstrumentation()
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.add(capturingA);
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DataLoaderOptions options = newOptions().setInstrumentation(chainedItn);
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DataLoader<String, String> dl = DataLoaderFactory.newDataLoader(TestKit.keysAsValues(), options);
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dl.load("A");
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dl.load("B");
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CompletableFuture<List<String>> dispatch = dl.dispatch();
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await().until(dispatch::isDone);
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assertThat(capturingA.methods, equalTo(List.of("A_beginDispatch",
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"A_beginBatchLoader", "A_beginBatchLoader_onDispatched", "A_beginBatchLoader_onCompleted",
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"A_beginDispatch_onDispatched", "A_beginDispatch_onCompleted")));
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}
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@ParameterizedTest
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@MethodSource("org.dataloader.fixtures.parameterized.TestDataLoaderFactories#get")
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public void canChainTogetherManyInstrumentationsWithDifferentBatchLoaders(TestDataLoaderFactory factory) {
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CapturingInstrumentation capturingA = new CapturingInstrumentation("A");
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CapturingInstrumentation capturingB = new CapturingInstrumentation("B");
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CapturingInstrumentation capturingButReturnsNull = new CapturingInstrumentationReturnsNull("NULL");
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ChainedDataLoaderInstrumentation chainedItn = new ChainedDataLoaderInstrumentation()
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.add(capturingA)
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.add(capturingB)
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.add(capturingButReturnsNull);
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DataLoaderOptions options = newOptions().setInstrumentation(chainedItn);
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DataLoader<String, String> dl = factory.idLoader(options);
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dl.load("A");
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dl.load("B");
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CompletableFuture<List<String>> dispatch = dl.dispatch();
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await().until(dispatch::isDone);
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//
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// A_beginBatchLoader happens before A_beginDispatch_onDispatched because these are sync
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// and no async - a batch scheduler or async batch loader would change that
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//
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assertThat(capturingA.methods, equalTo(List.of("A_beginDispatch",
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"A_beginBatchLoader", "A_beginBatchLoader_onDispatched", "A_beginBatchLoader_onCompleted",
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"A_beginDispatch_onDispatched", "A_beginDispatch_onCompleted")));
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assertThat(capturingB.methods, equalTo(List.of("B_beginDispatch",
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"B_beginBatchLoader", "B_beginBatchLoader_onDispatched", "B_beginBatchLoader_onCompleted",
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"B_beginDispatch_onDispatched", "B_beginDispatch_onCompleted")));
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// it returned null on all its contexts - nothing to call back on
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assertThat(capturingButReturnsNull.methods, equalTo(List.of("NULL_beginDispatch", "NULL_beginBatchLoader")));
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}
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}

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