/*
* Copyright 2017 ThoughtWorks, 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.thoughtworks.go.server.service.lookups;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import com.thoughtworks.go.config.BasicCruiseConfig;
import com.thoughtworks.go.config.CruiseConfig;
import com.thoughtworks.go.config.ServerConfig;
import com.thoughtworks.go.server.cache.GoCache;
import com.thoughtworks.go.server.service.GoConfigService;
import com.thoughtworks.go.util.SystemEnvironment;
import org.junit.Before;
import org.junit.Test;
import org.mockito.Mock;
import static com.thoughtworks.go.helper.CommandSnippetMother.validSnippet;
import static com.thoughtworks.go.util.SystemEnvironment.COMMAND_REPOSITORY_DIRECTORY;
import static org.hamcrest.core.Is.is;
import static org.junit.Assert.assertThat;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;
import static org.mockito.MockitoAnnotations.initMocks;
public class CachedCommandSnippetsTest {
private static final String EXPECTED_REPO_DIR = "some-directory/default";
private static final String CUSTOM_REPO_DIR = "some-directory/custom";
@Mock private SystemEnvironment systemEnvironment;
@Mock private CommandRepositoryDirectoryWalker walker;
@Mock private GoConfigService goConfigService;
@Mock private GoCache goCache;
private CachedCommandSnippets commandSnippetsCache;
private CommandSnippets expectedSnippets;
@Before
public void setUp() throws Exception {
initMocks(this);
setupAFakeCommandRepoLocation("default");
when(systemEnvironment.get(SystemEnvironment.COMMAND_REPOSITORY_CACHE_TIME_IN_SECONDS)).thenReturn(300);
expectedSnippets = new CommandSnippets(Arrays.asList(validSnippet("snippet1")));
when(walker.getAllCommandSnippets(EXPECTED_REPO_DIR)).thenReturn(expectedSnippets);
commandSnippetsCache = new CachedCommandSnippets(walker, goConfigService, systemEnvironment, goCache);
}
@Test
public void shouldFetchCommandSnippetsWhenCacheHasBeenJustCreated() throws Exception {
when(goCache.get(CachedCommandSnippets.CACHE_KEY)).thenReturn(null);
commandSnippetsCache.snippets();
verify(walker).getAllCommandSnippets(EXPECTED_REPO_DIR);
verify(goCache, times(1)).get(CachedCommandSnippets.CACHE_KEY);
}
@Test
public void shouldFetchFromCacheIfAlreadyInCache() throws Exception {
when(goCache.get(CachedCommandSnippets.CACHE_KEY)).thenReturn(null, expectedSnippets);
CommandSnippets actualSnippetsWhichAreNotFromCache = commandSnippetsCache.snippets();
CommandSnippets actualSnippetsWhichAreFromCache = commandSnippetsCache.snippets();
verify(walker).getAllCommandSnippets(EXPECTED_REPO_DIR);
verify(goCache, times(2)).get(CachedCommandSnippets.CACHE_KEY);
assertThat(expectedSnippets, is(actualSnippetsWhichAreNotFromCache));
assertThat(expectedSnippets, is(actualSnippetsWhichAreFromCache));
}
@Test
public void shouldAllowForcefullyReloadingCache() throws Exception {
when(goCache.get(CachedCommandSnippets.CACHE_KEY)).thenReturn(null, expectedSnippets);
commandSnippetsCache.snippets();
commandSnippetsCache.reload();
commandSnippetsCache.snippets();
verify(walker, times(2)).getAllCommandSnippets(EXPECTED_REPO_DIR);
}
@Test
public void shouldTimeoutCacheAndReloadAfterCacheHasExpiredBecauseOfTime() throws Exception {
when(goCache.get(CachedCommandSnippets.CACHE_KEY)).thenReturn(null, expectedSnippets);
when(systemEnvironment.get(SystemEnvironment.COMMAND_REPOSITORY_CACHE_TIME_IN_SECONDS)).thenReturn(1);
commandSnippetsCache.snippets();
Thread.sleep(2 * 1000);
commandSnippetsCache.snippets();
verify(walker, times(2)).getAllCommandSnippets(EXPECTED_REPO_DIR);
}
@Test
public void shouldReloadCacheWhenRepoLocationHasBeenModified() throws Exception {
CommandSnippets expectedSnippetsFromCustomRepo = new CommandSnippets(Arrays.asList(validSnippet("snippet2")));
when(goCache.get(CachedCommandSnippets.CACHE_KEY)).thenReturn(null, expectedSnippets);
when(walker.getAllCommandSnippets(CUSTOM_REPO_DIR)).thenReturn(expectedSnippetsFromCustomRepo);
setupAFakeCommandRepoLocation("default", "custom");
CommandSnippets snippetsFromDefaultRepo = commandSnippetsCache.snippets();
CommandSnippets snippetsFromCustomRepo = commandSnippetsCache.snippets();
verify(walker).getAllCommandSnippets(EXPECTED_REPO_DIR);
verify(walker).getAllCommandSnippets(CUSTOM_REPO_DIR);
assertThat(snippetsFromDefaultRepo, is(expectedSnippets));
assertThat(snippetsFromCustomRepo, is(expectedSnippetsFromCustomRepo));
}
@Test(timeout = 10 * 1000)
public void shouldWorkWhenThereAreThreadsTryingToAccessAndReloadCommandSnippets() throws Exception {
when(systemEnvironment.get(SystemEnvironment.COMMAND_REPOSITORY_CACHE_TIME_IN_SECONDS)).thenReturn(1);
Thread threadWhichAccessesSnippets = new Thread() {
@Override
public void run() {
for (int i = 0; i < 200; i++) {
commandSnippetsCache.snippets();
try {
Thread.sleep(10);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}
};
Thread threadWhichReloadsSnippets = new Thread() {
@Override
public void run() {
for (int i = 0; i < 200; i++) {
commandSnippetsCache.reload();
try {
Thread.sleep(10);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}
};
List<Throwable> exceptionsInTheThreads = new ArrayList<>();
threadWhichAccessesSnippets.setUncaughtExceptionHandler(uncaughtExceptionHandler(exceptionsInTheThreads));
threadWhichReloadsSnippets.setUncaughtExceptionHandler(uncaughtExceptionHandler(exceptionsInTheThreads));
threadWhichAccessesSnippets.start();
threadWhichReloadsSnippets.start();
threadWhichAccessesSnippets.join();
threadWhichReloadsSnippets.join();
assertThat(exceptionsInTheThreads, is(Collections.<Throwable>emptyList()));
}
private Thread.UncaughtExceptionHandler uncaughtExceptionHandler(final List<Throwable> exceptionsInTheThreads) {
return new Thread.UncaughtExceptionHandler() {
@Override
public void uncaughtException(Thread t, Throwable e) {
e.printStackTrace();
exceptionsInTheThreads.add(e);
}
};
}
private void setupAFakeCommandRepoLocation(final String location, final String... otherLocations) {
CruiseConfig cruiseConfig = mock(BasicCruiseConfig.class);
ServerConfig serverConfig = mock(ServerConfig.class);
when(systemEnvironment.get(COMMAND_REPOSITORY_DIRECTORY)).thenReturn("some-directory");
when(goConfigService.currentCruiseConfig()).thenReturn(cruiseConfig);
when(cruiseConfig.server()).thenReturn(serverConfig);
when(serverConfig.getCommandRepositoryLocation()).thenReturn(location, otherLocations);
}
}