/*
* Copyright (c) 2008-2014 MongoDB, 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.mongodb;
import com.mongodb.connection.ClusterDescription;
import com.mongodb.connection.ServerDescription;
import com.mongodb.connection.ServerType;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import static com.mongodb.connection.ClusterConnectionMode.MULTIPLE;
import static com.mongodb.connection.ClusterType.REPLICA_SET;
import static com.mongodb.connection.ServerConnectionState.CONNECTED;
import static com.mongodb.connection.ServerType.REPLICA_SET_OTHER;
import static java.util.Arrays.asList;
import static java.util.concurrent.TimeUnit.NANOSECONDS;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
public class ReadPreferenceChooseServersTest {
private static final int FOUR_MEG = 4 * 1024 * 1024;
private static final String HOST = "localhost";
private ServerDescription primary, secondary, otherSecondary;
private ClusterDescription set;
private ClusterDescription setNoSecondary;
private ClusterDescription setNoPrimary;
@Before
public void setUp() throws IOException {
final TagSet tags1 = new TagSet(asList(new Tag("foo", "1"), new Tag("bar", "2"), new Tag("baz", "1")));
final TagSet tags2 = new TagSet(asList(new Tag("foo", "1"), new Tag("bar", "2"), new Tag("baz", "2")));
final TagSet tags3 = new TagSet(asList(new Tag("foo", "1"), new Tag("bar", "2"), new Tag("baz", "3")));
long acceptableLatencyMS = 15;
long bestRoundTripTime = 50;
long acceptableRoundTripTime = bestRoundTripTime + (acceptableLatencyMS / 2);
long unacceptableRoundTripTime = bestRoundTripTime + acceptableLatencyMS + 1;
primary = ServerDescription.builder().state(CONNECTED).address(new ServerAddress(HOST, 27017))
.roundTripTime(acceptableRoundTripTime * 1000000L, NANOSECONDS)
.ok(true)
.type(ServerType.REPLICA_SET_PRIMARY)
.tagSet(tags1)
.maxDocumentSize(FOUR_MEG).build();
secondary = ServerDescription.builder().state(CONNECTED).address(new ServerAddress(HOST, 27018))
.roundTripTime(bestRoundTripTime * 1000000L, NANOSECONDS)
.ok(true)
.type(ServerType.REPLICA_SET_SECONDARY)
.tagSet(tags2)
.maxDocumentSize(FOUR_MEG).build();
otherSecondary = ServerDescription.builder().state(CONNECTED).address(new ServerAddress(HOST, 27019))
.roundTripTime(unacceptableRoundTripTime * 1000000L, NANOSECONDS)
.ok(true)
.type(ServerType.REPLICA_SET_SECONDARY)
.tagSet(tags3)
.maxDocumentSize(FOUR_MEG)
.build();
ServerDescription uninitiatedMember = ServerDescription.builder().state(CONNECTED).address(new ServerAddress(HOST, 27020))
.roundTripTime(unacceptableRoundTripTime * 1000000L, NANOSECONDS)
.ok(true)
.type(REPLICA_SET_OTHER)
.maxDocumentSize(FOUR_MEG)
.build();
List<ServerDescription> nodeList = new ArrayList<ServerDescription>();
nodeList.add(primary);
nodeList.add(secondary);
nodeList.add(otherSecondary);
nodeList.add(uninitiatedMember);
set = new ClusterDescription(MULTIPLE, REPLICA_SET, nodeList);
setNoPrimary = new ClusterDescription(MULTIPLE, REPLICA_SET, asList(secondary, otherSecondary));
setNoSecondary = new ClusterDescription(MULTIPLE, REPLICA_SET, asList(primary, uninitiatedMember));
}
@Test
public void testPrimaryReadPreference() {
assertEquals(1, ReadPreference.primary().choose(set).size());
assertEquals(primary, ReadPreference.primary().choose(set).get(0));
assertTrue(ReadPreference.primary().choose(setNoPrimary).isEmpty());
}
@Test
public void testSecondaryReadPreference() {
TaggableReadPreference pref = (TaggableReadPreference) ReadPreference.secondary();
List<ServerDescription> candidates = pref.choose(set);
assertEquals(2, candidates.size());
assertTrue(candidates.contains(secondary));
assertTrue(candidates.contains(otherSecondary));
List<TagSet> tagSetList = asList(new TagSet(new Tag("foo", "1")), new TagSet(new Tag("bar", "2")));
pref = ReadPreference.secondary(tagSetList);
assertEquals(tagSetList, pref.getTagSetList());
pref = ReadPreference.secondary(new TagSet(new Tag("baz", "1")));
assertTrue(pref.choose(set).isEmpty());
pref = ReadPreference.secondary(new TagSet(new Tag("baz", "2")));
candidates = pref.choose(set);
assertEquals(1, candidates.size());
assertTrue(candidates.contains(secondary));
pref = ReadPreference.secondary(new TagSet(new Tag("unknown", "1")));
assertTrue(pref.choose(set).isEmpty());
pref = ReadPreference.secondary(asList(new TagSet(new Tag("unknown", "1")), new TagSet(new Tag("baz", "2"))));
candidates = pref.choose(set);
assertEquals(1, candidates.size());
assertTrue(candidates.contains(secondary));
}
@Test
public void testPrimaryPreferredMode() {
ReadPreference pref = ReadPreference.primaryPreferred();
List<ServerDescription> candidates = pref.choose(set);
assertEquals(1, candidates.size());
assertEquals(primary, candidates.get(0));
candidates = pref.choose(setNoPrimary);
assertEquals(2, candidates.size());
assertTrue(candidates.contains(secondary));
assertTrue(candidates.contains(otherSecondary));
pref = ReadPreference.primaryPreferred(new TagSet(new Tag("baz", "2")));
assertEquals(1, pref.choose(set).size());
assertEquals(primary, pref.choose(set).get(0));
assertEquals(1, pref.choose(setNoPrimary).size());
assertEquals(secondary, pref.choose(setNoPrimary).get(0));
}
@Test
public void testSecondaryPreferredMode() {
ReadPreference pref = ReadPreference.secondary(new TagSet(new Tag("baz", "2")));
List<ServerDescription> candidates = pref.choose(set);
assertEquals(1, candidates.size());
assertTrue(candidates.contains(secondary));
// test that the primary is returned if no secondaries match the tag
pref = ReadPreference.secondaryPreferred(new TagSet(new Tag("unknown", "2")));
assertTrue(pref.choose(set).get(0).equals(primary));
pref = ReadPreference.secondaryPreferred();
candidates = pref.choose(set);
assertEquals(2, candidates.size());
assertTrue(candidates.contains(secondary));
assertTrue(candidates.contains(otherSecondary));
assertTrue(ReadPreference.secondaryPreferred().choose(setNoSecondary).contains(primary));
}
@Test
public void testNearestMode() {
ReadPreference pref = ReadPreference.nearest();
assertTrue(pref.choose(set) != null);
pref = ReadPreference.nearest(new TagSet(new Tag("baz", "1")));
assertTrue(pref.choose(set).get(0).equals(primary));
pref = ReadPreference.nearest(new TagSet(new Tag("baz", "2")));
assertTrue(pref.choose(set).get(0).equals(secondary));
pref = ReadPreference.nearest(new TagSet(new Tag("unknown", "2")));
assertTrue(pref.choose(set).isEmpty());
}
}