iSharkFly-Docs/java-tutorials
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

BAEL-1155 crdt (#2659)

Browse Source 
* BAEL-1155 crdt

* BAEL-1155 fix pom
This commit is contained in:
Tomasz Lelek 2017-10-06 10:36:50 +02:00 committed by Grzegorz Piwowarek
parent 6818505bea
commit c521aa66af
2 changed files with 163 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
libraries/pom.xml
View File

@ -596,6 +596,11 @@
<artifactId>jgrapht-core</artifactId>
<version>1.0.1</version>
</dependency>
<dependency>
<groupId>com.netopyr.wurmloch</groupId>
<artifactId>wurmloch-crdt</artifactId>
<version>${crdt.version}</version>
</dependency>
</dependencies>
<repositories>
<repository>
@ -617,6 +622,7 @@
</repository>
</repositories>
<properties>
<crdt.version>0.1.0</crdt.version>
<multiverse.version>0.7.0</multiverse.version>
<cglib.version>3.2.4</cglib.version>
<commons-lang.version>3.6</commons-lang.version>

153
libraries/src/test/java/com/baeldung/crdt/CRDTTest.java Normal file
View File

@ -0,0 +1,153 @@
package com.baeldung.crdt;
import com.netopyr.wurmloch.crdt.GCounter;
import com.netopyr.wurmloch.crdt.GSet;
import com.netopyr.wurmloch.crdt.LWWRegister;
import com.netopyr.wurmloch.crdt.PNCounter;
import com.netopyr.wurmloch.store.LocalCrdtStore;
import org.junit.Test;
import static org.assertj.core.api.Assertions.assertThat;
public class CRDTTest {
@Test
public void givenGrowOnlySet_whenTwoReplicasDiverge_thenShouldMergeItWithoutAConflict() {
//given
final LocalCrdtStore crdtStore1 = new LocalCrdtStore();
final LocalCrdtStore crdtStore2 = new LocalCrdtStore();
crdtStore1.connect(crdtStore2);
final GSet<String> replica1 = crdtStore1.createGSet("ID_1");
final GSet<String> replica2 = crdtStore2.<String>findGSet("ID_1").get();
//when
replica1.add("apple");
replica2.add("banana");
//then
assertThat(replica1).contains("apple", "banana");
assertThat(replica2).contains("apple", "banana");
//when
crdtStore1.disconnect(crdtStore2);
replica1.add("strawberry");
replica2.add("pear");
assertThat(replica1).contains("apple", "banana", "strawberry");
assertThat(replica2).contains("apple", "banana", "pear");
crdtStore1.connect(crdtStore2);
//then
assertThat(replica1).contains("apple", "banana", "strawberry", "pear");
assertThat(replica2).contains("apple", "banana", "strawberry", "pear");
}
@Test
public void givenIncrementOnlyCounter_whenTwoReplicasDiverge_thenShouldMergeIt() {
//given
final LocalCrdtStore crdtStore1 = new LocalCrdtStore();
final LocalCrdtStore crdtStore2 = new LocalCrdtStore();
crdtStore1.connect(crdtStore2);
final GCounter replica1 = crdtStore1.createGCounter("ID_1");
final GCounter replica2 = crdtStore2.findGCounter("ID_1").get();
//when
replica1.increment();
replica2.increment(2L);
//then
assertThat(replica1.get()).isEqualTo(3L);
assertThat(replica2.get()).isEqualTo(3L);
//when
crdtStore1.disconnect(crdtStore2);
replica1.increment(3L);
replica2.increment(5L);
assertThat(replica1.get()).isEqualTo(6L);
assertThat(replica2.get()).isEqualTo(8L);
crdtStore1.connect(crdtStore2);
// then
assertThat(replica1.get()).isEqualTo(11L);
assertThat(replica2.get()).isEqualTo(11L);
}
@Test
public void givenPNCounter_whenReplicasDiverge_thenShouldMergeWithoutAConflict() {
// given
final LocalCrdtStore crdtStore1 = new LocalCrdtStore();
final LocalCrdtStore crdtStore2 = new LocalCrdtStore();
crdtStore1.connect(crdtStore2);
final PNCounter replica1 = crdtStore1.createPNCounter("ID_1");
final PNCounter replica2 = crdtStore2.findPNCounter("ID_1").get();
//when
replica1.increment();
replica2.decrement(2L);
//then
assertThat(replica1.get()).isEqualTo(-1L);
assertThat(replica2.get()).isEqualTo(-1L);
//when
crdtStore1.disconnect(crdtStore2);
replica1.decrement(3L);
replica2.increment(5L);
assertThat(replica1.get()).isEqualTo(-4L);
assertThat(replica2.get()).isEqualTo(4L);
crdtStore1.connect(crdtStore2);
//then
assertThat(replica1.get()).isEqualTo(1L);
assertThat(replica2.get()).isEqualTo(1L);
}
@Test
public void givenLastWriteWinsStrategy_whenReplicasDiverge_thenAfterMergeShouldKeepOnlyLastValue() {
//given
final LocalCrdtStore crdtStore1 = new LocalCrdtStore("N_1");
final LocalCrdtStore crdtStore2 = new LocalCrdtStore("N_2");
crdtStore1.connect(crdtStore2);
final LWWRegister<String> replica1 = crdtStore1.createLWWRegister("ID_1");
final LWWRegister<String> replica2 = crdtStore2.<String>findLWWRegister("ID_1").get();
//when
replica1.set("apple");
replica2.set("banana");
// then
assertThat(replica1.get()).isEqualTo("banana");
assertThat(replica2.get()).isEqualTo("banana");
// when
crdtStore1.disconnect(crdtStore2);
replica1.set("strawberry");
replica2.set("pear");
assertThat(replica1.get()).isEqualTo("strawberry");
assertThat(replica2.get()).isEqualTo("pear");
crdtStore1.connect(crdtStore2);
//then
assertThat(replica1.get()).isEqualTo("pear");
assertThat(replica2.get()).isEqualTo("pear");
}
}