Examples with Helper io.grpc.LoadBalancer.Helper used on opensource projects

Example 11 with Helper

use of io.grpc.LoadBalancer.Helper in project grpc-java by grpc.

the class PriorityLoadBalancerTest method typicalPriorityFailOverFlow.

@Test
public void typicalPriorityFailOverFlow() {
    PriorityChildConfig priorityChildConfig0 = new PriorityChildConfig(new PolicySelection(fooLbProvider, new Object()), true);
    PriorityChildConfig priorityChildConfig1 = new PriorityChildConfig(new PolicySelection(fooLbProvider, new Object()), true);
    PriorityChildConfig priorityChildConfig2 = new PriorityChildConfig(new PolicySelection(fooLbProvider, new Object()), true);
    PriorityChildConfig priorityChildConfig3 = new PriorityChildConfig(new PolicySelection(fooLbProvider, new Object()), true);
    PriorityLbConfig priorityLbConfig = new PriorityLbConfig(ImmutableMap.of("p0", priorityChildConfig0, "p1", priorityChildConfig1, "p2", priorityChildConfig2, "p3", priorityChildConfig3), ImmutableList.of("p0", "p1", "p2", "p3"));
    priorityLb.handleResolvedAddresses(ResolvedAddresses.newBuilder().setAddresses(ImmutableList.<EquivalentAddressGroup>of()).setLoadBalancingPolicyConfig(priorityLbConfig).build());
    assertThat(fooBalancers).hasSize(1);
    assertThat(fooHelpers).hasSize(1);
    LoadBalancer balancer0 = Iterables.getLast(fooBalancers);
    Helper helper0 = Iterables.getOnlyElement(fooHelpers);
    // p0 gets READY.
    final Subchannel subchannel0 = mock(Subchannel.class);
    helper0.updateBalancingState(READY, new SubchannelPicker() {

        @Override
        public PickResult pickSubchannel(PickSubchannelArgs args) {
            return PickResult.withSubchannel(subchannel0);
        }
    });
    assertCurrentPickerPicksSubchannel(subchannel0);
    // p0 fails over to p1 immediately.
    helper0.updateBalancingState(TRANSIENT_FAILURE, new ErrorPicker(Status.ABORTED));
    assertLatestConnectivityState(CONNECTING);
    assertThat(fooBalancers).hasSize(2);
    assertThat(fooHelpers).hasSize(2);
    LoadBalancer balancer1 = Iterables.getLast(fooBalancers);
    // p1 timeout, and fails over to p2
    fakeClock.forwardTime(10, TimeUnit.SECONDS);
    assertLatestConnectivityState(CONNECTING);
    assertThat(fooBalancers).hasSize(3);
    assertThat(fooHelpers).hasSize(3);
    LoadBalancer balancer2 = Iterables.getLast(fooBalancers);
    Helper helper2 = Iterables.getLast(fooHelpers);
    // p2 gets READY
    final Subchannel subchannel1 = mock(Subchannel.class);
    helper2.updateBalancingState(READY, new SubchannelPicker() {

        @Override
        public PickResult pickSubchannel(PickSubchannelArgs args) {
            return PickResult.withSubchannel(subchannel1);
        }
    });
    assertCurrentPickerPicksSubchannel(subchannel1);
    // p0 gets back to READY
    final Subchannel subchannel2 = mock(Subchannel.class);
    helper0.updateBalancingState(READY, new SubchannelPicker() {

        @Override
        public PickResult pickSubchannel(PickSubchannelArgs args) {
            return PickResult.withSubchannel(subchannel2);
        }
    });
    assertCurrentPickerPicksSubchannel(subchannel2);
    // p2 fails but does not affect overall picker
    helper2.updateBalancingState(TRANSIENT_FAILURE, new ErrorPicker(Status.UNAVAILABLE));
    assertCurrentPickerPicksSubchannel(subchannel2);
    // p0 fails over to p3 immediately since p1 already timeout and p2 already in TRANSIENT_FAILURE.
    helper0.updateBalancingState(TRANSIENT_FAILURE, new ErrorPicker(Status.UNAVAILABLE));
    assertLatestConnectivityState(CONNECTING);
    assertThat(fooBalancers).hasSize(4);
    assertThat(fooHelpers).hasSize(4);
    LoadBalancer balancer3 = Iterables.getLast(fooBalancers);
    Helper helper3 = Iterables.getLast(fooHelpers);
    // p3 timeout then the channel should go to TRANSIENT_FAILURE
    fakeClock.forwardTime(10, TimeUnit.SECONDS);
    assertCurrentPickerReturnsError(Status.Code.UNAVAILABLE, "timeout");
    // p3 fails then the picker should have error status updated
    helper3.updateBalancingState(TRANSIENT_FAILURE, new ErrorPicker(Status.DATA_LOSS.withDescription("foo")));
    assertCurrentPickerReturnsError(Status.Code.DATA_LOSS, "foo");
    // p2 gets back to READY
    final Subchannel subchannel3 = mock(Subchannel.class);
    helper2.updateBalancingState(READY, new SubchannelPicker() {

        @Override
        public PickResult pickSubchannel(PickSubchannelArgs args) {
            return PickResult.withSubchannel(subchannel3);
        }
    });
    assertCurrentPickerPicksSubchannel(subchannel3);
    // p0 gets back to READY
    final Subchannel subchannel4 = mock(Subchannel.class);
    helper0.updateBalancingState(READY, new SubchannelPicker() {

        @Override
        public PickResult pickSubchannel(PickSubchannelArgs args) {
            return PickResult.withSubchannel(subchannel4);
        }
    });
    assertCurrentPickerPicksSubchannel(subchannel4);
    // p0 fails over to p2 and picker is updated to p2's existing picker.
    helper0.updateBalancingState(TRANSIENT_FAILURE, new ErrorPicker(Status.UNAVAILABLE));
    assertCurrentPickerPicksSubchannel(subchannel3);
    // Deactivate child balancer get deleted.
    fakeClock.forwardTime(15, TimeUnit.MINUTES);
    verify(balancer0, never()).shutdown();
    verify(balancer1, never()).shutdown();
    verify(balancer2, never()).shutdown();
    verify(balancer3).shutdown();
}

Example 12 with Helper

use of io.grpc.LoadBalancer.Helper in project grpc-java by grpc.

the class PriorityLoadBalancerTest method idleToConnectingDoesNotTriggerFailOver.

@Test
public void idleToConnectingDoesNotTriggerFailOver() {
    PriorityChildConfig priorityChildConfig0 = new PriorityChildConfig(new PolicySelection(fooLbProvider, new Object()), true);
    PriorityChildConfig priorityChildConfig1 = new PriorityChildConfig(new PolicySelection(fooLbProvider, new Object()), true);
    PriorityLbConfig priorityLbConfig = new PriorityLbConfig(ImmutableMap.of("p0", priorityChildConfig0, "p1", priorityChildConfig1), ImmutableList.of("p0", "p1"));
    priorityLb.handleResolvedAddresses(ResolvedAddresses.newBuilder().setAddresses(ImmutableList.<EquivalentAddressGroup>of()).setLoadBalancingPolicyConfig(priorityLbConfig).build());
    assertThat(fooBalancers).hasSize(1);
    assertThat(fooHelpers).hasSize(1);
    Helper helper0 = Iterables.getOnlyElement(fooHelpers);
    // p0 gets IDLE.
    helper0.updateBalancingState(IDLE, BUFFER_PICKER);
    assertCurrentPickerIsBufferPicker();
    // p0 goes to CONNECTING
    helper0.updateBalancingState(IDLE, BUFFER_PICKER);
    assertCurrentPickerIsBufferPicker();
    // no failover happened
    assertThat(fooBalancers).hasSize(1);
    assertThat(fooHelpers).hasSize(1);
}

Example 13 with Helper

use of io.grpc.LoadBalancer.Helper in project grpc-java by grpc.

the class PriorityLoadBalancerTest method typicalPriorityFailOverFlowWithIdleUpdate.

@Test
public void typicalPriorityFailOverFlowWithIdleUpdate() {
    PriorityChildConfig priorityChildConfig0 = new PriorityChildConfig(new PolicySelection(fooLbProvider, new Object()), true);
    PriorityChildConfig priorityChildConfig1 = new PriorityChildConfig(new PolicySelection(fooLbProvider, new Object()), true);
    PriorityChildConfig priorityChildConfig2 = new PriorityChildConfig(new PolicySelection(fooLbProvider, new Object()), true);
    PriorityChildConfig priorityChildConfig3 = new PriorityChildConfig(new PolicySelection(fooLbProvider, new Object()), true);
    PriorityLbConfig priorityLbConfig = new PriorityLbConfig(ImmutableMap.of("p0", priorityChildConfig0, "p1", priorityChildConfig1, "p2", priorityChildConfig2, "p3", priorityChildConfig3), ImmutableList.of("p0", "p1", "p2", "p3"));
    priorityLb.handleResolvedAddresses(ResolvedAddresses.newBuilder().setAddresses(ImmutableList.<EquivalentAddressGroup>of()).setLoadBalancingPolicyConfig(priorityLbConfig).build());
    assertThat(fooBalancers).hasSize(1);
    assertThat(fooHelpers).hasSize(1);
    LoadBalancer balancer0 = Iterables.getLast(fooBalancers);
    Helper helper0 = Iterables.getOnlyElement(fooHelpers);
    // p0 gets IDLE.
    helper0.updateBalancingState(IDLE, BUFFER_PICKER);
    assertCurrentPickerIsBufferPicker();
    // p0 fails over to p1 immediately.
    helper0.updateBalancingState(TRANSIENT_FAILURE, new ErrorPicker(Status.ABORTED));
    assertLatestConnectivityState(CONNECTING);
    assertThat(fooBalancers).hasSize(2);
    assertThat(fooHelpers).hasSize(2);
    LoadBalancer balancer1 = Iterables.getLast(fooBalancers);
    // p1 timeout, and fails over to p2
    fakeClock.forwardTime(10, TimeUnit.SECONDS);
    assertLatestConnectivityState(CONNECTING);
    assertThat(fooBalancers).hasSize(3);
    assertThat(fooHelpers).hasSize(3);
    LoadBalancer balancer2 = Iterables.getLast(fooBalancers);
    Helper helper2 = Iterables.getLast(fooHelpers);
    // p2 gets IDLE
    helper2.updateBalancingState(IDLE, BUFFER_PICKER);
    assertCurrentPickerIsBufferPicker();
    // p0 gets back to IDLE
    helper0.updateBalancingState(IDLE, BUFFER_PICKER);
    assertCurrentPickerIsBufferPicker();
    // p2 fails but does not affect overall picker
    helper2.updateBalancingState(TRANSIENT_FAILURE, new ErrorPicker(Status.UNAVAILABLE));
    assertCurrentPickerIsBufferPicker();
    // p0 fails over to p3 immediately since p1 already timeout and p2 already in TRANSIENT_FAILURE.
    helper0.updateBalancingState(TRANSIENT_FAILURE, new ErrorPicker(Status.UNAVAILABLE));
    assertLatestConnectivityState(CONNECTING);
    assertThat(fooBalancers).hasSize(4);
    assertThat(fooHelpers).hasSize(4);
    LoadBalancer balancer3 = Iterables.getLast(fooBalancers);
    Helper helper3 = Iterables.getLast(fooHelpers);
    // p3 timeout then the channel should go to TRANSIENT_FAILURE
    fakeClock.forwardTime(10, TimeUnit.SECONDS);
    assertCurrentPickerReturnsError(Status.Code.UNAVAILABLE, "timeout");
    // p3 fails then the picker should have error status updated
    helper3.updateBalancingState(TRANSIENT_FAILURE, new ErrorPicker(Status.DATA_LOSS.withDescription("foo")));
    assertCurrentPickerReturnsError(Status.Code.DATA_LOSS, "foo");
    // p2 gets back to IDLE
    helper2.updateBalancingState(IDLE, BUFFER_PICKER);
    assertCurrentPickerIsBufferPicker();
    // p0 gets back to IDLE
    helper0.updateBalancingState(IDLE, BUFFER_PICKER);
    assertCurrentPickerIsBufferPicker();
    // p0 fails over to p2 and picker is updated to p2's existing picker.
    helper0.updateBalancingState(TRANSIENT_FAILURE, new ErrorPicker(Status.UNAVAILABLE));
    assertCurrentPickerIsBufferPicker();
    // Deactivate child balancer get deleted.
    fakeClock.forwardTime(15, TimeUnit.MINUTES);
    verify(balancer0, never()).shutdown();
    verify(balancer1, never()).shutdown();
    verify(balancer2, never()).shutdown();
    verify(balancer3).shutdown();
}

Example 14 with Helper

use of io.grpc.LoadBalancer.Helper in project grpc-java by grpc.

the class PriorityLoadBalancerTest method raceBetweenShutdownAndChildLbBalancingStateUpdate.

@Test
public void raceBetweenShutdownAndChildLbBalancingStateUpdate() {
    PriorityChildConfig priorityChildConfig0 = new PriorityChildConfig(new PolicySelection(fooLbProvider, new Object()), true);
    PriorityChildConfig priorityChildConfig1 = new PriorityChildConfig(new PolicySelection(fooLbProvider, new Object()), false);
    PriorityLbConfig priorityLbConfig = new PriorityLbConfig(ImmutableMap.of("p0", priorityChildConfig0, "p1", priorityChildConfig1), ImmutableList.of("p0", "p1"));
    priorityLb.handleResolvedAddresses(ResolvedAddresses.newBuilder().setAddresses(ImmutableList.<EquivalentAddressGroup>of()).setLoadBalancingPolicyConfig(priorityLbConfig).build());
    verify(helper).updateBalancingState(eq(CONNECTING), eq(BUFFER_PICKER));
    // LB shutdown and subchannel state change can happen simultaneously. If shutdown runs first,
    // any further balancing state update should be ignored.
    priorityLb.shutdown();
    // priority p0
    Helper priorityHelper0 = Iterables.getOnlyElement(fooHelpers);
    priorityHelper0.updateBalancingState(READY, mock(SubchannelPicker.class));
    verifyNoMoreInteractions(helper);
}

Example 15 with Helper

use of io.grpc.LoadBalancer.Helper in project grpc-java by grpc.

the class LeastRequestLoadBalancerProviderTest method providesLoadBalancer.

@Test
public void providesLoadBalancer() {
    Helper helper = mock(Helper.class);
    when(helper.getSynchronizationContext()).thenReturn(syncContext);
    when(helper.getAuthority()).thenReturn(AUTHORITY);
    assertThat(provider.newLoadBalancer(helper)).isInstanceOf(LeastRequestLoadBalancer.class);
}