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

Example 6 with Helper

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

the class GracefulSwitchLoadBalancerTest method newLbFactoryEqualToOldOneShouldHaveNoEffect.

@Test
public void newLbFactoryEqualToOldOneShouldHaveNoEffect() {
    final List<LoadBalancer> balancers = new ArrayList<>();
    final class LoadBalancerFactoryWithId extends LoadBalancer.Factory {

        final int id;

        LoadBalancerFactoryWithId(int id) {
            this.id = id;
        }

        @Override
        public LoadBalancer newLoadBalancer(Helper helper) {
            LoadBalancer balancer = mock(LoadBalancer.class);
            balancers.add(balancer);
            return balancer;
        }

        @Override
        public boolean equals(Object o) {
            if (!(o instanceof LoadBalancerFactoryWithId)) {
                return false;
            }
            LoadBalancerFactoryWithId that = (LoadBalancerFactoryWithId) o;
            return id == that.id;
        }

        @Override
        public int hashCode() {
            return id;
        }
    }
    gracefulSwitchLb.switchTo(new LoadBalancerFactoryWithId(0));
    assertThat(balancers).hasSize(1);
    LoadBalancer lb0 = balancers.get(0);
    gracefulSwitchLb.switchTo(new LoadBalancerFactoryWithId(0));
    assertThat(balancers).hasSize(1);
    gracefulSwitchLb.switchTo(new LoadBalancerFactoryWithId(1));
    assertThat(balancers).hasSize(2);
    LoadBalancer lb1 = balancers.get(1);
    verify(lb0).shutdown();
    verifyNoMoreInteractions(lb0, lb1);
}

Example 7 with Helper

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

the class GracefulSwitchLoadBalancerTest method canHandleEmptyAddressListFromNameResolutionForwardedToLatestPolicy.

@Test
public void canHandleEmptyAddressListFromNameResolutionForwardedToLatestPolicy() {
    gracefulSwitchLb.switchTo(lbProviders.get(lbPolicies[0]));
    LoadBalancer lb0 = balancers.get(lbPolicies[0]);
    Helper helper0 = helpers.get(lb0);
    SubchannelPicker picker = mock(SubchannelPicker.class);
    helper0.updateBalancingState(READY, picker);
    assertThat(gracefulSwitchLb.canHandleEmptyAddressListFromNameResolution()).isFalse();
    doReturn(true).when(lb0).canHandleEmptyAddressListFromNameResolution();
    assertThat(gracefulSwitchLb.canHandleEmptyAddressListFromNameResolution()).isTrue();
    gracefulSwitchLb.switchTo(lbProviders.get(lbPolicies[1]));
    LoadBalancer lb1 = balancers.get(lbPolicies[1]);
    assertThat(gracefulSwitchLb.canHandleEmptyAddressListFromNameResolution()).isFalse();
    doReturn(true).when(lb1).canHandleEmptyAddressListFromNameResolution();
    assertThat(gracefulSwitchLb.canHandleEmptyAddressListFromNameResolution()).isTrue();
    gracefulSwitchLb.switchTo(lbProviders.get(lbPolicies[2]));
    LoadBalancer lb2 = balancers.get(lbPolicies[2]);
    assertThat(gracefulSwitchLb.canHandleEmptyAddressListFromNameResolution()).isFalse();
    doReturn(true).when(lb2).canHandleEmptyAddressListFromNameResolution();
    assertThat(gracefulSwitchLb.canHandleEmptyAddressListFromNameResolution()).isTrue();
}

Example 8 with Helper

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

the class GracefulSwitchLoadBalancerTest method updateBalancingStateIsGraceful.

@Test
public void updateBalancingStateIsGraceful() {
    gracefulSwitchLb.switchTo(lbProviders.get(lbPolicies[0]));
    LoadBalancer lb0 = balancers.get(lbPolicies[0]);
    Helper helper0 = helpers.get(lb0);
    SubchannelPicker picker = mock(SubchannelPicker.class);
    helper0.updateBalancingState(READY, picker);
    verify(mockHelper).updateBalancingState(READY, picker);
    gracefulSwitchLb.switchTo(lbProviders.get(lbPolicies[1]));
    LoadBalancer lb1 = balancers.get(lbPolicies[1]);
    Helper helper1 = helpers.get(lb1);
    picker = mock(SubchannelPicker.class);
    helper1.updateBalancingState(CONNECTING, picker);
    verify(mockHelper, never()).updateBalancingState(CONNECTING, picker);
    gracefulSwitchLb.switchTo(lbProviders.get(lbPolicies[2]));
    verify(lb1).shutdown();
    LoadBalancer lb2 = balancers.get(lbPolicies[2]);
    Helper helper2 = helpers.get(lb2);
    picker = mock(SubchannelPicker.class);
    helper2.updateBalancingState(CONNECTING, picker);
    verify(mockHelper, never()).updateBalancingState(CONNECTING, picker);
    // lb2 reports READY
    SubchannelPicker picker2 = mock(SubchannelPicker.class);
    helper2.updateBalancingState(READY, picker2);
    verify(lb0).shutdown();
    verify(mockHelper).updateBalancingState(READY, picker2);
    gracefulSwitchLb.switchTo(lbProviders.get(lbPolicies[3]));
    LoadBalancer lb3 = balancers.get(lbPolicies[3]);
    Helper helper3 = helpers.get(lb3);
    SubchannelPicker picker3 = mock(SubchannelPicker.class);
    helper3.updateBalancingState(CONNECTING, picker3);
    verify(mockHelper, never()).updateBalancingState(CONNECTING, picker3);
    // lb2 out of READY
    picker2 = mock(SubchannelPicker.class);
    helper2.updateBalancingState(CONNECTING, picker2);
    verify(mockHelper, never()).updateBalancingState(CONNECTING, picker2);
    verify(mockHelper).updateBalancingState(CONNECTING, picker3);
    verify(lb2).shutdown();
    picker3 = mock(SubchannelPicker.class);
    helper3.updateBalancingState(CONNECTING, picker3);
    verify(mockHelper).updateBalancingState(CONNECTING, picker3);
    verifyNoMoreInteractions(lb0, lb1, lb2, lb3);
}

Example 9 with Helper

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

the class GracefulSwitchLoadBalancerTest method switchWhileOldPolicyGoesFromReadyToNotReadyWhileNewPolicyStillIdle.

@Test
public void switchWhileOldPolicyGoesFromReadyToNotReadyWhileNewPolicyStillIdle() {
    gracefulSwitchLb.switchTo(lbProviders.get(lbPolicies[0]));
    LoadBalancer lb0 = balancers.get(lbPolicies[0]);
    InOrder inOrder = inOrder(lb0, mockHelper);
    Helper helper0 = helpers.get(lb0);
    SubchannelPicker picker = mock(SubchannelPicker.class);
    helper0.updateBalancingState(READY, picker);
    gracefulSwitchLb.switchTo(lbProviders.get(lbPolicies[1]));
    verify(lb0, never()).shutdown();
    LoadBalancer lb1 = balancers.get(lbPolicies[1]);
    Helper helper1 = helpers.get(lb1);
    picker = mock(SubchannelPicker.class);
    helper0.updateBalancingState(CONNECTING, picker);
    verify(mockHelper, never()).updateBalancingState(CONNECTING, picker);
    inOrder.verify(mockHelper).updateBalancingState(CONNECTING, BUFFER_PICKER);
    // shutdown after update
    inOrder.verify(lb0).shutdown();
    picker = mock(SubchannelPicker.class);
    helper1.updateBalancingState(CONNECTING, picker);
    inOrder.verify(mockHelper).updateBalancingState(CONNECTING, picker);
    inOrder.verifyNoMoreInteractions();
    verifyNoMoreInteractions(lb1);
}

Example 10 with Helper

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

the class PriorityLoadBalancerTest method bypassReresolutionRequestsIfConfiged.

@Test
public void bypassReresolutionRequestsIfConfiged() {
    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());
    // priority p0
    Helper priorityHelper0 = Iterables.getOnlyElement(fooHelpers);
    priorityHelper0.refreshNameResolution();
    verify(helper, never()).refreshNameResolution();
    // Simulate fallback to priority p1.
    priorityHelper0.updateBalancingState(TRANSIENT_FAILURE, new ErrorPicker(Status.UNAVAILABLE));
    assertThat(fooHelpers).hasSize(2);
    Helper priorityHelper1 = Iterables.getLast(fooHelpers);
    priorityHelper1.refreshNameResolution();
    verify(helper).refreshNameResolution();
}