Java Code Examples for org.apache.flink.api.common.state.ReducingState#add()

The following examples show how to use org.apache.flink.api.common.state.ReducingState#add() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example 1

Source File: ContinuousEventTimeTrigger.java From flink with Apache License 2.0

6 votes

@Override
public TriggerResult onEventTime(long time, W window, TriggerContext ctx) throws Exception {

	if (time == window.maxTimestamp()){
		return TriggerResult.FIRE;
	}

	ReducingState<Long> fireTimestampState = ctx.getPartitionedState(stateDesc);

	Long fireTimestamp = fireTimestampState.get();

	if (fireTimestamp != null && fireTimestamp == time) {
		fireTimestampState.clear();
		fireTimestampState.add(time + interval);
		ctx.registerEventTimeTimer(time + interval);
		return TriggerResult.FIRE;
	}

	return TriggerResult.CONTINUE;
}

Example 2

Source File: StateBackendTestBase.java From flink with Apache License 2.0

6 votes

/**
 * Verify that an empty {@code ReduceState} yields {@code null}.
 */
@Test
public void testReducingStateDefaultValue() throws Exception {
	AbstractKeyedStateBackend<Integer> backend = createKeyedBackend(IntSerializer.INSTANCE);

	ReducingStateDescriptor<String> kvId = new ReducingStateDescriptor<>("id", new AppendingReduce(), String.class);

	ReducingState<String> state = backend.getPartitionedState(
			VoidNamespace.INSTANCE,
			VoidNamespaceSerializer.INSTANCE, kvId);

	backend.setCurrentKey(1);
	assertNull(state.get());

	state.add("Ciao");
	assertEquals("Ciao", state.get());

	state.clear();
	assertNull(state.get());

	backend.dispose();
}

Example 3

Source File: StateBackendTestBase.java From flink with Apache License 2.0

6 votes

/**
 * Verify that an empty {@code ReduceState} yields {@code null}.
 */
@Test
public void testReducingStateDefaultValue() throws Exception {
	AbstractKeyedStateBackend<Integer> backend = createKeyedBackend(IntSerializer.INSTANCE);

	ReducingStateDescriptor<String> kvId = new ReducingStateDescriptor<>("id", new AppendingReduce(), String.class);

	ReducingState<String> state = backend.getPartitionedState(
			VoidNamespace.INSTANCE,
			VoidNamespaceSerializer.INSTANCE, kvId);

	backend.setCurrentKey(1);
	assertNull(state.get());

	state.add("Ciao");
	assertEquals("Ciao", state.get());

	state.clear();
	assertNull(state.get());

	backend.dispose();
}

Example 4

Source File: ContinuousEventTimeTrigger.java From flink with Apache License 2.0

6 votes

@Override
public TriggerResult onElement(Object element, long timestamp, W window, TriggerContext ctx) throws Exception {

	if (window.maxTimestamp() <= ctx.getCurrentWatermark()) {
		// if the watermark is already past the window fire immediately
		return TriggerResult.FIRE;
	} else {
		ctx.registerEventTimeTimer(window.maxTimestamp());
	}

	ReducingState<Long> fireTimestamp = ctx.getPartitionedState(stateDesc);
	if (fireTimestamp.get() == null) {
		long start = timestamp - (timestamp % interval);
		long nextFireTimestamp = start + interval;
		ctx.registerEventTimeTimer(nextFireTimestamp);
		fireTimestamp.add(nextFireTimestamp);
	}

	return TriggerResult.CONTINUE;
}

Example 5

Source File: ContinuousEventTimeTrigger.java From Flink-CEPplus with Apache License 2.0

6 votes

@Override
public TriggerResult onEventTime(long time, W window, TriggerContext ctx) throws Exception {

	if (time == window.maxTimestamp()){
		return TriggerResult.FIRE;
	}

	ReducingState<Long> fireTimestampState = ctx.getPartitionedState(stateDesc);

	Long fireTimestamp = fireTimestampState.get();

	if (fireTimestamp != null && fireTimestamp == time) {
		fireTimestampState.clear();
		fireTimestampState.add(time + interval);
		ctx.registerEventTimeTimer(time + interval);
		return TriggerResult.FIRE;
	}

	return TriggerResult.CONTINUE;
}

Example 6

Source File: ContinuousEventTimeTrigger.java From flink with Apache License 2.0

6 votes

@Override
public TriggerResult onEventTime(long time, W window, TriggerContext ctx) throws Exception {

	if (time == window.maxTimestamp()){
		return TriggerResult.FIRE;
	}

	ReducingState<Long> fireTimestampState = ctx.getPartitionedState(stateDesc);

	Long fireTimestamp = fireTimestampState.get();

	if (fireTimestamp != null && fireTimestamp == time) {
		fireTimestampState.clear();
		fireTimestampState.add(time + interval);
		ctx.registerEventTimeTimer(time + interval);
		return TriggerResult.FIRE;
	}

	return TriggerResult.CONTINUE;
}

Example 7

Source File: ContinuousProcessingTimeTrigger.java From flink with Apache License 2.0

6 votes

@Override
public TriggerResult onElement(Object element, long timestamp, W window, TriggerContext ctx) throws Exception {
	ReducingState<Long> fireTimestamp = ctx.getPartitionedState(stateDesc);

	timestamp = ctx.getCurrentProcessingTime();

	if (fireTimestamp.get() == null) {
		long start = timestamp - (timestamp % interval);
		long nextFireTimestamp = start + interval;

		ctx.registerProcessingTimeTimer(nextFireTimestamp);

		fireTimestamp.add(nextFireTimestamp);
		return TriggerResult.CONTINUE;
	}
	return TriggerResult.CONTINUE;
}

Example 8

Source File: ElementTriggers.java From flink with Apache License 2.0

5 votes

@Override
public boolean onElement(Object element, long timestamp, W window) throws Exception {
	ReducingState<Long> count = ctx.getPartitionedState(countStateDesc);
	count.add(1L);
	if (count.get() >= countElems) {
		count.clear();
		return true;
	} else {
		return false;
	}
}

Example 9

Source File: ContinuousProcessingTimeTrigger.java From flink with Apache License 2.0

5 votes

@Override
public TriggerResult onProcessingTime(long time, W window, TriggerContext ctx) throws Exception {
	ReducingState<Long> fireTimestamp = ctx.getPartitionedState(stateDesc);

	if (fireTimestamp.get().equals(time)) {
		fireTimestamp.clear();
		fireTimestamp.add(time + interval);
		ctx.registerProcessingTimeTimer(time + interval);
		return TriggerResult.FIRE;
	}
	return TriggerResult.CONTINUE;
}

Example 10

Source File: ProcessingTimeTriggers.java From flink with Apache License 2.0

5 votes

@Override
public boolean onProcessingTime(long time, W window) throws Exception {
	ReducingState<Long> nextFiring = ctx.getPartitionedState(nextFiringStateDesc);
	Long timer = nextFiring.get();
	if (timer != null && timer == time) {
		long newTimer = time + interval;
		ctx.registerProcessingTimeTimer(newTimer);
		nextFiring.clear();
		nextFiring.add(newTimer);
		return true;
	} else {
		return false;
	}
}

Example 11

Source File: CountTrigger.java From flink with Apache License 2.0

5 votes

@Override
public TriggerResult onElement(Object element, long timestamp, W window, TriggerContext ctx) throws Exception {
	ReducingState<Long> count = ctx.getPartitionedState(stateDesc);
	count.add(1L);
	if (count.get() >= maxCount) {
		count.clear();
		return TriggerResult.FIRE;
	}
	return TriggerResult.CONTINUE;
}

Example 12

Source File: ContinuousProcessingTimeTrigger.java From Flink-CEPplus with Apache License 2.0

5 votes

@Override
public TriggerResult onProcessingTime(long time, W window, TriggerContext ctx) throws Exception {
	ReducingState<Long> fireTimestamp = ctx.getPartitionedState(stateDesc);

	if (fireTimestamp.get().equals(time)) {
		fireTimestamp.clear();
		fireTimestamp.add(time + interval);
		ctx.registerProcessingTimeTimer(time + interval);
		return TriggerResult.FIRE;
	}
	return TriggerResult.CONTINUE;
}

Example 13

Source File: CountTrigger.java From Flink-CEPplus with Apache License 2.0

5 votes

@Override
public TriggerResult onElement(Object element, long timestamp, W window, TriggerContext ctx) throws Exception {
	ReducingState<Long> count = ctx.getPartitionedState(stateDesc);
	count.add(1L);
	if (count.get() >= maxCount) {
		count.clear();
		return TriggerResult.FIRE;
	}
	return TriggerResult.CONTINUE;
}

Example 14

Source File: StateBackendTestBase.java From Flink-CEPplus with Apache License 2.0

4 votes

@Test
@SuppressWarnings("unchecked")
public void testReducingState() throws Exception {
	CheckpointStreamFactory streamFactory = createStreamFactory();
	SharedStateRegistry sharedStateRegistry = new SharedStateRegistry();
	AbstractKeyedStateBackend<Integer> backend = createKeyedBackend(IntSerializer.INSTANCE);

	ReducingStateDescriptor<String> kvId = new ReducingStateDescriptor<>("id", new AppendingReduce(), String.class);

	TypeSerializer<Integer> keySerializer = IntSerializer.INSTANCE;
	TypeSerializer<VoidNamespace> namespaceSerializer = VoidNamespaceSerializer.INSTANCE;

	ReducingState<String> state = backend.getPartitionedState(VoidNamespace.INSTANCE, VoidNamespaceSerializer.INSTANCE, kvId);
	@SuppressWarnings("unchecked")
	InternalKvState<Integer, VoidNamespace, String> kvState = (InternalKvState<Integer, VoidNamespace, String>) state;

	// this is only available after the backend initialized the serializer
	TypeSerializer<String> valueSerializer = kvId.getSerializer();

	// some modifications to the state
	backend.setCurrentKey(1);
	assertNull(state.get());
	assertNull(getSerializedValue(kvState, 1, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));
	state.add("1");
	backend.setCurrentKey(2);
	assertNull(state.get());
	assertNull(getSerializedValue(kvState, 2, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));
	state.add("2");
	backend.setCurrentKey(1);
	assertEquals("1", state.get());
	assertEquals("1", getSerializedValue(kvState, 1, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));

	// draw a snapshot
	KeyedStateHandle snapshot1 = runSnapshot(
		backend.snapshot(682375462378L, 2, streamFactory, CheckpointOptions.forCheckpointWithDefaultLocation()),
		sharedStateRegistry);

	// make some more modifications
	backend.setCurrentKey(1);
	state.add("u1");
	backend.setCurrentKey(2);
	state.add("u2");
	backend.setCurrentKey(3);
	state.add("u3");

	// draw another snapshot
	KeyedStateHandle snapshot2 = runSnapshot(
		backend.snapshot(682375462379L, 4, streamFactory, CheckpointOptions.forCheckpointWithDefaultLocation()),
		sharedStateRegistry);

	// validate the original state
	backend.setCurrentKey(1);
	assertEquals("1,u1", state.get());
	assertEquals("1,u1", getSerializedValue(kvState, 1, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));
	backend.setCurrentKey(2);
	assertEquals("2,u2", state.get());
	assertEquals("2,u2", getSerializedValue(kvState, 2, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));
	backend.setCurrentKey(3);
	assertEquals("u3", state.get());
	assertEquals("u3", getSerializedValue(kvState, 3, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));

	backend.dispose();
	// restore the first snapshot and validate it
	backend = restoreKeyedBackend(IntSerializer.INSTANCE, snapshot1);
	snapshot1.discardState();

	ReducingState<String> restored1 = backend.getPartitionedState(VoidNamespace.INSTANCE, VoidNamespaceSerializer.INSTANCE, kvId);
	@SuppressWarnings("unchecked")
	InternalKvState<Integer, VoidNamespace, String> restoredKvState1 = (InternalKvState<Integer, VoidNamespace, String>) restored1;

	backend.setCurrentKey(1);
	assertEquals("1", restored1.get());
	assertEquals("1", getSerializedValue(restoredKvState1, 1, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));
	backend.setCurrentKey(2);
	assertEquals("2", restored1.get());
	assertEquals("2", getSerializedValue(restoredKvState1, 2, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));

	backend.dispose();
	// restore the second snapshot and validate it
	backend = restoreKeyedBackend(IntSerializer.INSTANCE, snapshot2);
	snapshot2.discardState();

	ReducingState<String> restored2 = backend.getPartitionedState(VoidNamespace.INSTANCE, VoidNamespaceSerializer.INSTANCE, kvId);
	@SuppressWarnings("unchecked")
	InternalKvState<Integer, VoidNamespace, String> restoredKvState2 = (InternalKvState<Integer, VoidNamespace, String>) restored2;

	backend.setCurrentKey(1);
	assertEquals("1,u1", restored2.get());
	assertEquals("1,u1", getSerializedValue(restoredKvState2, 1, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));
	backend.setCurrentKey(2);
	assertEquals("2,u2", restored2.get());
	assertEquals("2,u2", getSerializedValue(restoredKvState2, 2, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));
	backend.setCurrentKey(3);
	assertEquals("u3", restored2.get());
	assertEquals("u3", getSerializedValue(restoredKvState2, 3, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));

	backend.dispose();
}

Example 15

Source File: StateBackendTestBase.java From flink with Apache License 2.0

4 votes

@Test
public void testReducingStateAddAndGet() throws Exception {

	final ReducingStateDescriptor<Long> stateDescr =
		new ReducingStateDescriptor<>("my-state", (a, b) -> a + b, Long.class);

	AbstractKeyedStateBackend<String> keyedBackend = createKeyedBackend(StringSerializer.INSTANCE);

	try {
		ReducingState<Long> state =
			keyedBackend.getPartitionedState(VoidNamespace.INSTANCE, VoidNamespaceSerializer.INSTANCE, stateDescr);

		keyedBackend.setCurrentKey("abc");
		assertNull(state.get());

		keyedBackend.setCurrentKey("def");
		assertNull(state.get());
		state.add(17L);
		state.add(11L);
		assertEquals(28L, state.get().longValue());

		keyedBackend.setCurrentKey("abc");
		assertNull(state.get());

		keyedBackend.setCurrentKey("g");
		assertNull(state.get());
		state.add(1L);
		state.add(2L);

		keyedBackend.setCurrentKey("def");
		assertEquals(28L, state.get().longValue());
		state.clear();
		assertNull(state.get());

		keyedBackend.setCurrentKey("g");
		state.add(3L);
		state.add(2L);
		state.add(1L);

		keyedBackend.setCurrentKey("def");
		assertNull(state.get());

		keyedBackend.setCurrentKey("g");
		assertEquals(9L, state.get().longValue());
		state.clear();

		// make sure all lists / maps are cleared
		assertThat("State backend is not empty.", keyedBackend.numKeyValueStateEntries(), is(0));
	}
	finally {
		keyedBackend.close();
		keyedBackend.dispose();
	}
}

Example 16

Source File: TtlReducingStateVerifier.java From Flink-CEPplus with Apache License 2.0

4 votes

@Override
void updateInternal(@Nonnull ReducingState<Integer> state, Integer update) throws Exception {
	state.add(update);
}

Example 17

Source File: StateBackendTestBase.java From Flink-CEPplus with Apache License 2.0

4 votes

@Test
@SuppressWarnings("unchecked")
public void testReducingStateRestoreWithWrongSerializers() throws Exception {
	CheckpointStreamFactory streamFactory = createStreamFactory();
	SharedStateRegistry sharedStateRegistry = new SharedStateRegistry();
	AbstractKeyedStateBackend<Integer> backend = createKeyedBackend(IntSerializer.INSTANCE);

	try {
		ReducingStateDescriptor<String> kvId = new ReducingStateDescriptor<>("id",
				new AppendingReduce(),
				StringSerializer.INSTANCE);
		ReducingState<String> state = backend.getPartitionedState(VoidNamespace.INSTANCE, VoidNamespaceSerializer.INSTANCE, kvId);

		backend.setCurrentKey(1);
		state.add("1");
		backend.setCurrentKey(2);
		state.add("2");

		// draw a snapshot
		KeyedStateHandle snapshot1 = runSnapshot(
			backend.snapshot(682375462378L, 2, streamFactory, CheckpointOptions.forCheckpointWithDefaultLocation()),
			sharedStateRegistry);

		backend.dispose();
		// restore the first snapshot and validate it
		backend = restoreKeyedBackend(IntSerializer.INSTANCE, snapshot1);
		snapshot1.discardState();

		@SuppressWarnings("unchecked")
		TypeSerializer<String> fakeStringSerializer =
				(TypeSerializer<String>) (TypeSerializer<?>) FloatSerializer.INSTANCE;

		try {
			kvId = new ReducingStateDescriptor<>("id", new AppendingReduce(), fakeStringSerializer);

			state = backend.getPartitionedState(VoidNamespace.INSTANCE, VoidNamespaceSerializer.INSTANCE, kvId);

			state.get();

			fail("should recognize wrong serializers");
		} catch (StateMigrationException ignored) {
			// expected
		}
	} finally {
		backend.dispose();
	}
}

Example 18

Source File: TtlReducingStateVerifier.java From flink with Apache License 2.0

4 votes

@Override
void updateInternal(@Nonnull ReducingState<Integer> state, Integer update) throws Exception {
	state.add(update);
}

Example 19

Source File: StateBackendTestBase.java From flink with Apache License 2.0

4 votes

@Test
@SuppressWarnings("unchecked")
public void testReducingState() throws Exception {
	CheckpointStreamFactory streamFactory = createStreamFactory();
	SharedStateRegistry sharedStateRegistry = new SharedStateRegistry();
	AbstractKeyedStateBackend<Integer> backend = createKeyedBackend(IntSerializer.INSTANCE);

	ReducingStateDescriptor<String> kvId = new ReducingStateDescriptor<>("id", new AppendingReduce(), String.class);

	TypeSerializer<Integer> keySerializer = IntSerializer.INSTANCE;
	TypeSerializer<VoidNamespace> namespaceSerializer = VoidNamespaceSerializer.INSTANCE;

	ReducingState<String> state = backend.getPartitionedState(VoidNamespace.INSTANCE, VoidNamespaceSerializer.INSTANCE, kvId);
	@SuppressWarnings("unchecked")
	InternalKvState<Integer, VoidNamespace, String> kvState = (InternalKvState<Integer, VoidNamespace, String>) state;

	// this is only available after the backend initialized the serializer
	TypeSerializer<String> valueSerializer = kvId.getSerializer();

	// some modifications to the state
	backend.setCurrentKey(1);
	assertNull(state.get());
	assertNull(getSerializedValue(kvState, 1, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));
	state.add("1");
	backend.setCurrentKey(2);
	assertNull(state.get());
	assertNull(getSerializedValue(kvState, 2, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));
	state.add("2");
	backend.setCurrentKey(1);
	assertEquals("1", state.get());
	assertEquals("1", getSerializedValue(kvState, 1, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));

	// draw a snapshot
	KeyedStateHandle snapshot1 = runSnapshot(
		backend.snapshot(682375462378L, 2, streamFactory, CheckpointOptions.forCheckpointWithDefaultLocation()),
		sharedStateRegistry);

	// make some more modifications
	backend.setCurrentKey(1);
	state.add("u1");
	backend.setCurrentKey(2);
	state.add("u2");
	backend.setCurrentKey(3);
	state.add("u3");

	// draw another snapshot
	KeyedStateHandle snapshot2 = runSnapshot(
		backend.snapshot(682375462379L, 4, streamFactory, CheckpointOptions.forCheckpointWithDefaultLocation()),
		sharedStateRegistry);

	// validate the original state
	backend.setCurrentKey(1);
	assertEquals("1,u1", state.get());
	assertEquals("1,u1", getSerializedValue(kvState, 1, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));
	backend.setCurrentKey(2);
	assertEquals("2,u2", state.get());
	assertEquals("2,u2", getSerializedValue(kvState, 2, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));
	backend.setCurrentKey(3);
	assertEquals("u3", state.get());
	assertEquals("u3", getSerializedValue(kvState, 3, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));

	backend.dispose();
	// restore the first snapshot and validate it
	backend = restoreKeyedBackend(IntSerializer.INSTANCE, snapshot1);
	snapshot1.discardState();

	ReducingState<String> restored1 = backend.getPartitionedState(VoidNamespace.INSTANCE, VoidNamespaceSerializer.INSTANCE, kvId);
	@SuppressWarnings("unchecked")
	InternalKvState<Integer, VoidNamespace, String> restoredKvState1 = (InternalKvState<Integer, VoidNamespace, String>) restored1;

	backend.setCurrentKey(1);
	assertEquals("1", restored1.get());
	assertEquals("1", getSerializedValue(restoredKvState1, 1, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));
	backend.setCurrentKey(2);
	assertEquals("2", restored1.get());
	assertEquals("2", getSerializedValue(restoredKvState1, 2, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));

	backend.dispose();
	// restore the second snapshot and validate it
	backend = restoreKeyedBackend(IntSerializer.INSTANCE, snapshot2);
	snapshot2.discardState();

	ReducingState<String> restored2 = backend.getPartitionedState(VoidNamespace.INSTANCE, VoidNamespaceSerializer.INSTANCE, kvId);
	@SuppressWarnings("unchecked")
	InternalKvState<Integer, VoidNamespace, String> restoredKvState2 = (InternalKvState<Integer, VoidNamespace, String>) restored2;

	backend.setCurrentKey(1);
	assertEquals("1,u1", restored2.get());
	assertEquals("1,u1", getSerializedValue(restoredKvState2, 1, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));
	backend.setCurrentKey(2);
	assertEquals("2,u2", restored2.get());
	assertEquals("2,u2", getSerializedValue(restoredKvState2, 2, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));
	backend.setCurrentKey(3);
	assertEquals("u3", restored2.get());
	assertEquals("u3", getSerializedValue(restoredKvState2, 3, keySerializer, VoidNamespace.INSTANCE, namespaceSerializer, valueSerializer));

	backend.dispose();
}

Example 20

Source File: StateBackendTestBase.java From Flink-CEPplus with Apache License 2.0

4 votes

@Test
public void testReducingStateAddAndGet() throws Exception {

	final ReducingStateDescriptor<Long> stateDescr =
		new ReducingStateDescriptor<>("my-state", (a, b) -> a + b, Long.class);

	AbstractKeyedStateBackend<String> keyedBackend = createKeyedBackend(StringSerializer.INSTANCE);

	try {
		ReducingState<Long> state =
			keyedBackend.getPartitionedState(VoidNamespace.INSTANCE, VoidNamespaceSerializer.INSTANCE, stateDescr);

		keyedBackend.setCurrentKey("abc");
		assertNull(state.get());

		keyedBackend.setCurrentKey("def");
		assertNull(state.get());
		state.add(17L);
		state.add(11L);
		assertEquals(28L, state.get().longValue());

		keyedBackend.setCurrentKey("abc");
		assertNull(state.get());

		keyedBackend.setCurrentKey("g");
		assertNull(state.get());
		state.add(1L);
		state.add(2L);

		keyedBackend.setCurrentKey("def");
		assertEquals(28L, state.get().longValue());
		state.clear();
		assertNull(state.get());

		keyedBackend.setCurrentKey("g");
		state.add(3L);
		state.add(2L);
		state.add(1L);

		keyedBackend.setCurrentKey("def");
		assertNull(state.get());

		keyedBackend.setCurrentKey("g");
		assertEquals(9L, state.get().longValue());
		state.clear();

		// make sure all lists / maps are cleared
		assertThat("State backend is not empty.", keyedBackend.numKeyValueStateEntries(), is(0));
	}
	finally {
		keyedBackend.close();
		keyedBackend.dispose();
	}
}