com.facebook.buck.slb.ClientSideSlbTest.java Source code

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Here is the source code for com.facebook.buck.slb.ClientSideSlbTest.java

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/*
 * Copyright 2015-present Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License. You may obtain
 * a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

package com.facebook.buck.slb;

import com.facebook.buck.event.BuckEventBus;
import com.facebook.buck.timing.Clock;
import com.google.common.collect.ImmutableList;
import com.squareup.okhttp.Call;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;

import org.easymock.Capture;
import org.easymock.EasyMock;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

import java.io.IOException;
import java.net.URI;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;

public class ClientSideSlbTest {

    private static final ImmutableList<URI> SERVERS = ImmutableList.of(URI.create("http://localhost:4242"),
            URI.create("http://localhost:8484"), URI.create("http://localhost:2121"));

    private BuckEventBus mockBus;
    private Clock mockClock;
    private OkHttpClient mockClient;
    private ScheduledExecutorService mockScheduler;
    private ClientSideSlbConfig config;

    // Apparently EasyMock does not deal very well with Generic Types using wildcard ?.
    // Several workarounds can be found on StackOverflow this one being the list intrusive.
    @SuppressWarnings("rawtypes")
    private ScheduledFuture mockFuture;

    @Before
    public void setUp() {
        mockBus = EasyMock.createNiceMock(BuckEventBus.class);
        mockFuture = EasyMock.createMock(ScheduledFuture.class);
        mockClient = EasyMock.createNiceMock(OkHttpClient.class);
        mockScheduler = EasyMock.createMock(ScheduledExecutorService.class);
        mockClock = EasyMock.createMock(Clock.class);
        EasyMock.expect(mockClock.currentTimeMillis()).andReturn(42L).anyTimes();
        EasyMock.replay(mockClock);

        config = ClientSideSlbConfig.builder().setClock(mockClock).setSchedulerService(mockScheduler)
                .setPingHttpClient(mockClient).setServerPool(SERVERS).setEventBus(mockBus).build();
    }

    @Test
    @SuppressWarnings("unchecked")
    public void testBackgroundHealthCheckIsScheduled() {
        Capture<Runnable> capture = EasyMock.newCapture();
        EasyMock.expect(mockScheduler.scheduleWithFixedDelay(EasyMock.capture(capture), EasyMock.anyLong(),
                EasyMock.anyLong(), EasyMock.anyObject(TimeUnit.class))).andReturn(mockFuture).once();
        EasyMock.replay(mockScheduler);

        try (ClientSideSlb slb = new ClientSideSlb(config)) {
            Assert.assertTrue(capture.hasCaptured());
        }
    }

    @Test
    @SuppressWarnings("unchecked")
    public void testAllServersArePinged() throws IOException {
        Capture<Runnable> capture = EasyMock.newCapture();
        EasyMock.expect(mockScheduler.scheduleWithFixedDelay(EasyMock.capture(capture), EasyMock.anyLong(),
                EasyMock.anyLong(), EasyMock.anyObject(TimeUnit.class))).andReturn(mockFuture).once();
        Call mockCall = EasyMock.createMock(Call.class);
        EasyMock.expect(mockCall.execute()).andReturn(null).times(SERVERS.size());
        EasyMock.expect(mockClient.newCall(EasyMock.anyObject(Request.class))).andReturn(mockCall)
                .times(SERVERS.size());
        EasyMock.replay(mockClient, mockCall, mockScheduler);

        try (ClientSideSlb slb = new ClientSideSlb(config)) {
            Runnable healthCheckLoop = capture.getValue();
            healthCheckLoop.run();
        }
    }
}