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makes the level notion more clear by andimarek · Pull Request #3981 · graphql-java/graphql-java · GitHub

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makes the level notion more clear #3981

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makes the level notion more clear #3981

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43 changes: 27 additions & 16 deletions ...java/graphql/execution/instrumentation/dataloader/PerLevelDataLoaderDispatchStrategy.java
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Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,8 @@ private static class CallStack {

// this means one sub selection has been fully fetched
// and the expected execute objects calls for the next level have been calculated
// the level here is the level of the sub selection in order to avoid 0 levels, because
// the root fields are on level 1
private final LevelMap happenedOnFieldValueCallsPerLevel = new LevelMap();

private final Set<Integer> dispatchedLevels = ConcurrentHashMap.newKeySet();
Expand All @@ -85,9 +87,8 @@ private static class CallStack {


public CallStack() {
// in the first level there is only one sub selection,
// so we only expect one execute object call (which is actually an executionStrategy call)
expectedExecuteObjectCallsPerLevel.set(1, 1);
// the first execute object happens on level 0 and there is only one: the start of the strategy
expectedExecuteObjectCallsPerLevel.set(0, 1);
}

public void addResultPathWithDataLoader(int level, ResultPathWithDataLoader resultPathWithDataLoader) {
Expand Down Expand Up @@ -139,8 +140,8 @@ boolean allExecuteObjectCallsHappened(int level) {
return happenedExecuteObjectCallsPerLevel.get(level) == expectedExecuteObjectCallsPerLevel.get(level);
}

boolean allSubSelectionsFetchingHappened(int level) {
return happenedOnFieldValueCallsPerLevel.get(level) == expectedExecuteObjectCallsPerLevel.get(level);
boolean allSubSelectionsFetchingHappened(int subSelectionLevel) {
return happenedOnFieldValueCallsPerLevel.get(subSelectionLevel) == expectedExecuteObjectCallsPerLevel.get(subSelectionLevel - 1);
}

boolean allFetchesHappened(int level) {
Expand Down Expand Up @@ -197,17 +198,19 @@ public void executeDeferredOnFieldValueInfo(FieldValueInfo fieldValueInfo, Execu
@Override
public void executionStrategy(ExecutionContext executionContext, ExecutionStrategyParameters parameters) {
Assert.assertTrue(parameters.getExecutionStepInfo().getPath().isRootPath());
increaseHappenedExecuteObjectAndIncreaseExpectedFetchCount(1, parameters);
// the execute object on level 0 is beginning of the strategy
increaseHappenedExecuteObjectAndIncreaseExpectedFetchCount(0, parameters);
}

@Override
public void executionSerialStrategy(ExecutionContext executionContext, ExecutionStrategyParameters parameters) {
resetCallStack();
increaseHappenedExecuteObjectAndIncreaseExpectedFetchCount(1, 1);
increaseHappenedExecuteObjectAndIncreaseExpectedFetchCount(0, 1);
}

@Override
public void executionStrategyOnFieldValuesInfo(List<FieldValueInfo> fieldValueInfoList) {
// the root fields are the root sub selection on level 1
onFieldValuesInfoDispatchIfNeeded(fieldValueInfoList, 1);
}

Expand All @@ -220,19 +223,21 @@ public void executionStrategyOnFieldValuesException(Throwable t) {

@Override
public void executeObject(ExecutionContext executionContext, ExecutionStrategyParameters parameters) {
int curLevel = parameters.getExecutionStepInfo().getPath().getLevel() + 1;
int curLevel = parameters.getPath().getLevel();
increaseHappenedExecuteObjectAndIncreaseExpectedFetchCount(curLevel, parameters);
}

@Override
public void executeObjectOnFieldValuesInfo(List<FieldValueInfo> fieldValueInfoList, ExecutionStrategyParameters parameters) {
// the level of the sub selection that is fully fetched is one level more than parameters level
int curLevel = parameters.getPath().getLevel() + 1;
onFieldValuesInfoDispatchIfNeeded(fieldValueInfoList, curLevel);
}


@Override
public void executeObjectOnFieldValuesException(Throwable t, ExecutionStrategyParameters parameters) {
// the level of the sub selection that is errored is one level more than parameters level
int curLevel = parameters.getPath().getLevel() + 1;
callStack.lock.runLocked(() ->
callStack.increaseHappenedOnFieldValueCalls(curLevel)
Expand All @@ -246,7 +251,8 @@ private void increaseHappenedExecuteObjectAndIncreaseExpectedFetchCount(int curL
private void increaseHappenedExecuteObjectAndIncreaseExpectedFetchCount(int curLevel, int fieldCount) {
callStack.lock.runLocked(() -> {
callStack.increaseHappenedExecuteObjectCalls(curLevel);
callStack.increaseExpectedFetchCount(curLevel, fieldCount);
// the fetch happens on the next level
callStack.increaseExpectedFetchCount(curLevel + 1, fieldCount);
});
}

Expand All @@ -258,7 +264,7 @@ private void resetCallStack() {
callStack.clearFetchCount();
callStack.clearHappenedExecuteObjectCalls();
callStack.clearHappenedOnFieldValueCalls();
callStack.expectedExecuteObjectCallsPerLevel.set(1, 1);
callStack.expectedExecuteObjectCallsPerLevel.set(0, 1);
callStack.dispatchingFinishedPerLevel.clear();
callStack.dispatchingStartedPerLevel.clear();
callStack.allResultPathWithDataLoader.clear();
Expand All @@ -282,11 +288,12 @@ private void onFieldValuesInfoDispatchIfNeeded(List<FieldValueInfo> fieldValueIn
//
// thread safety: called with callStack.lock
//
// this means a sub selection has been fully fetched
private Integer handleOnFieldValuesInfo(List<FieldValueInfo> fieldValueInfos, int curLevel) {
callStack.increaseHappenedOnFieldValueCalls(curLevel);
int expectedOnObjectCalls = getObjectCountForList(fieldValueInfos);
// on the next level we expect the following on object calls because we found non null objects
callStack.increaseExpectedExecuteObjectCalls(curLevel + 1, expectedOnObjectCalls);
// we expect on the level of the current sub selection #expectedOnObjectCalls execute object calls
callStack.increaseExpectedExecuteObjectCalls(curLevel, expectedOnObjectCalls);
// maybe the object calls happened already (because the DataFetcher return directly values synchronously)
// therefore we check the next levels if they are ready
// this means we could skip some level because the higher level is also already ready,
Expand Down Expand Up @@ -339,6 +346,7 @@ public void fieldFetched(ExecutionContext executionContext,
private boolean dispatchIfNeeded(int level) {
boolean ready = checkLevelBeingReady(level);
if (ready) {
System.out.println("dispatchIfNeeded level " + level);
callStack.setDispatchedLevel(level);
return true;
}
Expand Down Expand Up @@ -379,21 +387,24 @@ private boolean checkLevelImpl(int level) {
if (callStack.expectedFetchCountPerLevel.get(level) == 0) {
return false;
}
// level 1 is special: there is no previous sub selections
// and the expected execution object calls is always 1
if (level > 1 && !callStack.allSubSelectionsFetchingHappened(level - 1)) {

// first we make sure that the expected fetch count is correct
// by verifying that the parent level all execute object + sub selection were fetched
if (!callStack.allExecuteObjectCallsHappened(level - 1)) {
return false;
}
if (!callStack.allExecuteObjectCallsHappened(level)) {
if (level > 1 && !callStack.allSubSelectionsFetchingHappened(level - 1)) {
return false;
}
// the main check: all fetches must have happened
if (!callStack.allFetchesHappened(level)) {
return false;
}
return true;
}

void dispatch(int level) {
System.out.println("dispatch level " + level);
if (!enableDataLoaderChaining) {
DataLoaderRegistry dataLoaderRegistry = executionContext.getDataLoaderRegistry();
dataLoaderRegistry.dispatchAll();
Expand Down
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