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

dupirefr/dupire.francois+pro@gmail.com [BAEL-3488] Timer Class (#8468)

Browse Source 
* [BAEL-3488] Added examples and tests

* [BAEL-3488] Moved code to core-java-date-operations-2 module

* [BAEL-3488] Added assertj library to maven dependencies
This commit is contained in:
François Dupire 2020-01-10 01:06:52 +01:00 committed by maibin
parent 31889765c3
commit 9136e9a6fb
5 changed files with 117 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
core-java-modules/core-java-date-operations-2/pom.xml
View File

@ -31,11 +31,18 @@
<artifactId>hirondelle-date4j</artifactId>
<version>${hirondelle-date4j.version}</version>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<properties>
<joda-time.version>2.10</joda-time.version>
<hirondelle-date4j.version>1.5.1</hirondelle-date4j.version>
<assertj.version>3.14.0</assertj.version>
</properties>
</project>

19
core-java-modules/core-java-date-operations-2/src/main/java/com/baeldung/timer/DatabaseMigrationTask.java Normal file
View File

@ -0,0 +1,19 @@
package com.baeldung.timer;
import java.util.List;
import java.util.TimerTask;
public class DatabaseMigrationTask extends TimerTask {
private List<String> oldDatabase;
private List<String> newDatabase;
public DatabaseMigrationTask(List<String> oldDatabase, List<String> newDatabase) {
this.oldDatabase = oldDatabase;
this.newDatabase = newDatabase;
}
@Override
public void run() {
newDatabase.addAll(oldDatabase);
}
}

14
core-java-modules/core-java-date-operations-2/src/main/java/com/baeldung/timer/NewsletterTask.java Normal file
View File

@ -0,0 +1,14 @@
package com.baeldung.timer;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.TimerTask;
public class NewsletterTask extends TimerTask {
@Override
public void run() {
System.out.println("Email sent at: "
+ LocalDateTime.ofInstant(Instant.ofEpochMilli(scheduledExecutionTime()), ZoneId.systemDefault()));
}
}

44
core-java-modules/core-java-date-operations-2/src/test/java/com/baeldung/timer/DatabaseMigrationTaskUnitTest.java Normal file
View File

@ -0,0 +1,44 @@
package com.baeldung.timer;
import org.junit.jupiter.api.Test;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.*;
import static org.assertj.core.api.Assertions.assertThat;
class DatabaseMigrationTaskUnitTest {
@Test
void givenDatabaseMigrationTask_whenTimerScheduledForNowPlusTwoSeconds_thenDataMigratedAfterTwoSeconds() throws Exception {
List<String> oldDatabase = Arrays.asList("Harrison Ford", "Carrie Fisher", "Mark Hamill");
List<String> newDatabase = new ArrayList<>();
LocalDateTime twoSecondsLater = LocalDateTime.now().plusSeconds(2);
Date twoSecondsLaterAsDate = Date.from(twoSecondsLater.atZone(ZoneId.systemDefault()).toInstant());
new Timer().schedule(new DatabaseMigrationTask(oldDatabase, newDatabase), twoSecondsLaterAsDate);
while (LocalDateTime.now().isBefore(twoSecondsLater)) {
assertThat(newDatabase).isEmpty();
Thread.sleep(500);
}
assertThat(newDatabase).containsExactlyElementsOf(oldDatabase);
}
@Test
void givenDatabaseMigrationTask_whenTimerScheduledInTwoSeconds_thenDataMigratedAfterTwoSeconds() throws Exception {
List<String> oldDatabase = Arrays.asList("Harrison Ford", "Carrie Fisher", "Mark Hamill");
List<String> newDatabase = new ArrayList<>();
new Timer().schedule(new DatabaseMigrationTask(oldDatabase, newDatabase), 2000);
LocalDateTime twoSecondsLater = LocalDateTime.now().plusSeconds(2);
while (LocalDateTime.now().isBefore(twoSecondsLater)) {
assertThat(newDatabase).isEmpty();
Thread.sleep(500);
}
assertThat(newDatabase).containsExactlyElementsOf(oldDatabase);
}
}

33
core-java-modules/core-java-date-operations-2/src/test/java/com/baeldung/timer/NewsletterTaskUnitTest.java Normal file
View File

@ -0,0 +1,33 @@
package com.baeldung.timer;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.Test;
import java.util.Timer;
class NewsletterTaskUnitTest {
private final Timer timer = new Timer();
@AfterEach
void afterEach() {
timer.cancel();
}
@Test
void givenNewsletterTask_whenTimerScheduledEachSecondFixedDelay_thenNewsletterSentEachSecond() throws Exception {
timer.schedule(new NewsletterTask(), 0, 1000);
for (int i = 0; i < 3; i++) {
Thread.sleep(1000);
}
}
@Test
void givenNewsletterTask_whenTimerScheduledEachSecondFixedRate_thenNewsletterSentEachSecond() throws Exception {
timer.scheduleAtFixedRate(new NewsletterTask(), 0, 1000);
for (int i = 0; i < 3; i++) {
Thread.sleep(1000);
}
}
}