[BAEL-16658] Split rxjava (& rxjava-2) by subject

This commit is contained in:
Sjmillington
2019-11-02 12:38:21 +00:00
parent 7940f0d912
commit f35c61c56a
65 changed files with 661 additions and 570 deletions

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package com.baeldung.rxjava;
import com.jakewharton.rxrelay2.Relay;
import io.reactivex.Observer;
import io.reactivex.disposables.Disposables;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
public class RandomRelay extends Relay<Integer> {
Random random = new Random();
List<Observer<? super Integer>> observers = new ArrayList<>();
@Override
public void accept(Integer integer) {
int observerIndex = random.nextInt(observers.size()) & Integer.MAX_VALUE;
observers.get(observerIndex).onNext(integer);
}
@Override
public boolean hasObservers() {
return observers.isEmpty();
}
@Override
protected void subscribeActual(Observer<? super Integer> observer) {
observers.add(observer);
observer.onSubscribe(Disposables.fromRunnable(() -> System.out.println("Disposed")));
}
}

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package com.baeldung.rxjava.jdbc;
import com.github.davidmoten.rx.jdbc.ConnectionProvider;
import com.github.davidmoten.rx.jdbc.ConnectionProviderFromUrl;
class Connector {
private static final String DB_CONNECTION = "jdbc:h2:mem:test;DB_CLOSE_DELAY=-1";
private static final String DB_USER = "";
private static final String DB_PASSWORD = "";
static final ConnectionProvider connectionProvider = new ConnectionProviderFromUrl(DB_CONNECTION, DB_USER, DB_PASSWORD);
}

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package com.baeldung.rxjava.jdbc;
import com.github.davidmoten.rx.jdbc.annotations.Column;
public interface Employee {
@Column("id")
int id();
@Column("name")
String name();
}

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package com.baeldung.rxjava.jdbc;
public class Manager {
private int id;
private String name;
public Manager(int id, String name) {
this.id = id;
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

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package com.baeldung.rxjava.jdbc;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import org.apache.commons.io.IOUtils;
class Utils {
static String getStringFromInputStream(InputStream input) throws IOException {
StringWriter writer = new StringWriter();
IOUtils.copy(input, writer, "UTF-8");
return writer.toString();
}
}

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package com.baeldung.rxjava;
import io.reactivex.BackpressureStrategy;
import io.reactivex.Flowable;
import io.reactivex.FlowableOnSubscribe;
import io.reactivex.Observable;
import io.reactivex.exceptions.MissingBackpressureException;
import io.reactivex.schedulers.Schedulers;
import io.reactivex.subscribers.TestSubscriber;
import org.junit.Test;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
public class FlowableIntegrationTest {
@Test public void whenFlowableIsCreated_thenItIsProperlyInitialized() {
Flowable<Integer> integerFlowable = Flowable.just(1, 2, 3, 4);
assertNotNull(integerFlowable);
}
@Test public void whenFlowableIsCreatedFromObservable_thenItIsProperlyInitialized() throws InterruptedException {
Observable<Integer> integerObservable = Observable.just(1, 2, 3);
Flowable<Integer> integerFlowable = integerObservable.toFlowable(BackpressureStrategy.BUFFER);
assertNotNull(integerFlowable);
}
@Test public void whenFlowableIsCreatedFromFlowableOnSubscribe_thenItIsProperlyInitialized() throws InterruptedException {
FlowableOnSubscribe<Integer> flowableOnSubscribe = flowableEmitter -> flowableEmitter.onNext(1);
Flowable<Integer> integerFlowable = Flowable.create(flowableOnSubscribe, BackpressureStrategy.BUFFER);
assertNotNull(integerFlowable);
}
@Test public void thenAllValuesAreBufferedAndReceived() {
List testList = IntStream.range(0, 100000).boxed().collect(Collectors.toList());
Observable observable = Observable.fromIterable(testList);
TestSubscriber<Integer> testSubscriber = observable.toFlowable(BackpressureStrategy.BUFFER).observeOn(Schedulers.computation()).test();
testSubscriber.awaitTerminalEvent();
List<Integer> receivedInts = testSubscriber.getEvents().get(0).stream().mapToInt(object -> (int) object).boxed().collect(Collectors.toList());
assertEquals(testList, receivedInts);
}
@Test public void whenDropStrategyUsed_thenOnBackpressureDropped() {
List testList = IntStream.range(0, 100000).boxed().collect(Collectors.toList());
Observable observable = Observable.fromIterable(testList);
TestSubscriber<Integer> testSubscriber = observable.toFlowable(BackpressureStrategy.DROP).observeOn(Schedulers.computation()).test();
testSubscriber.awaitTerminalEvent();
List<Integer> receivedInts = testSubscriber.getEvents().get(0).stream().mapToInt(object -> (int) object).boxed().collect(Collectors.toList());
assertThat(receivedInts.size() < testList.size());
assertThat(!receivedInts.contains(100000));
}
@Test public void whenMissingStrategyUsed_thenException() {
Observable observable = Observable.range(1, 100000);
TestSubscriber subscriber = observable.toFlowable(BackpressureStrategy.MISSING).observeOn(Schedulers.computation()).test();
subscriber.awaitTerminalEvent();
subscriber.assertError(MissingBackpressureException.class);
}
@Test public void whenErrorStrategyUsed_thenExceptionIsThrown() {
Observable observable = Observable.range(1, 100000);
TestSubscriber subscriber = observable.toFlowable(BackpressureStrategy.ERROR).observeOn(Schedulers.computation()).test();
subscriber.awaitTerminalEvent();
subscriber.assertError(MissingBackpressureException.class);
}
@Test public void whenLatestStrategyUsed_thenTheLastElementReceived() {
List testList = IntStream.range(0, 100000).boxed().collect(Collectors.toList());
Observable observable = Observable.fromIterable(testList);
TestSubscriber<Integer> testSubscriber = observable.toFlowable(BackpressureStrategy.LATEST).observeOn(Schedulers.computation()).test();
testSubscriber.awaitTerminalEvent();
List<Integer> receivedInts = testSubscriber.getEvents().get(0).stream().mapToInt(object -> (int) object).boxed().collect(Collectors.toList());
assertThat(receivedInts.size() < testList.size());
assertThat(receivedInts.contains(100000));
}
}

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package com.baeldung.rxjava;
import com.jakewharton.rxrelay2.BehaviorRelay;
import com.jakewharton.rxrelay2.PublishRelay;
import com.jakewharton.rxrelay2.ReplayRelay;
import io.reactivex.internal.schedulers.SingleScheduler;
import io.reactivex.observers.TestObserver;
import org.junit.Test;
import java.util.concurrent.TimeUnit;
public class RxRelayIntegrationTest {
@Test
public void whenObserverSubscribedToPublishRelay_thenItReceivesEmittedEvents () {
PublishRelay<Integer> publishRelay = PublishRelay.create();
TestObserver<Integer> firstObserver = TestObserver.create();
TestObserver<Integer> secondObserver = TestObserver.create();
publishRelay.subscribe(firstObserver);
firstObserver.assertSubscribed();
publishRelay.accept(5);
publishRelay.accept(10);
publishRelay.subscribe(secondObserver);
secondObserver.assertSubscribed();
publishRelay.accept(15);
//First Observer will receive all events
firstObserver.assertValues(5, 10, 15);
//Second Observer will receive only last event
secondObserver.assertValue(15);
}
@Test
public void whenObserverSubscribedToBehaviorRelayWithoutDefaultValue_thenItIsEmpty() {
BehaviorRelay<Integer> behaviorRelay = BehaviorRelay.create();
TestObserver<Integer> firstObserver = new TestObserver<>();
behaviorRelay.subscribe(firstObserver);
firstObserver.assertEmpty();
}
@Test
public void whenObserverSubscribedToBehaviorRelay_thenItReceivesDefaultValue() {
BehaviorRelay<Integer> behaviorRelay = BehaviorRelay.createDefault(1);
TestObserver<Integer> firstObserver = new TestObserver<>();
behaviorRelay.subscribe(firstObserver);
firstObserver.assertValue(1);
}
@Test
public void whenObserverSubscribedToBehaviorRelay_thenItReceivesEmittedEvents () {
BehaviorRelay<Integer> behaviorRelay = BehaviorRelay.create();
TestObserver<Integer> firstObserver = TestObserver.create();
TestObserver<Integer> secondObserver = TestObserver.create();
behaviorRelay.accept(5);
behaviorRelay.subscribe(firstObserver);
behaviorRelay.accept(10);
behaviorRelay.subscribe(secondObserver);
behaviorRelay.accept(15);
firstObserver.assertValues(5, 10, 15);
secondObserver.assertValues(10, 15);
}
@Test
public void whenObserverSubscribedToReplayRelay_thenItReceivesEmittedEvents () {
ReplayRelay<Integer> replayRelay = ReplayRelay.create();
TestObserver<Integer> firstObserver = TestObserver.create();
TestObserver<Integer> secondObserver = TestObserver.create();
replayRelay.subscribe(firstObserver);
replayRelay.accept(5);
replayRelay.accept(10);
replayRelay.accept(15);
replayRelay.subscribe(secondObserver);
firstObserver.assertValues(5, 10, 15);
secondObserver.assertValues(5, 10, 15);
}
@Test
public void whenObserverSubscribedToReplayRelayWithLimitedSize_thenItReceivesEmittedEvents () {
ReplayRelay<Integer> replayRelay = ReplayRelay.createWithSize(2);
TestObserver<Integer> firstObserver = TestObserver.create();
replayRelay.accept(5);
replayRelay.accept(10);
replayRelay.accept(15);
replayRelay.accept(20);
replayRelay.subscribe(firstObserver);
firstObserver.assertValues(15, 20);
}
@Test
public void whenObserverSubscribedToReplayRelayWithMaxAge_thenItReceivesEmittedEvents () throws InterruptedException {
ReplayRelay<Integer> replayRelay = ReplayRelay.createWithTime(2000, TimeUnit.MILLISECONDS, new SingleScheduler());
TestObserver<Integer> firstObserver = TestObserver.create();
replayRelay.accept(5);
replayRelay.accept(10);
replayRelay.accept(15);
replayRelay.accept(20);
Thread.sleep(3000);
replayRelay.subscribe(firstObserver);
firstObserver.assertEmpty();
}
@Test
public void whenTwoObserversSubscribedToRandomRelay_thenOnlyOneReceivesEvent () {
RandomRelay randomRelay = new RandomRelay();
TestObserver<Integer> firstObserver = TestObserver.create();
TestObserver<Integer> secondObserver = TestObserver.create();
randomRelay.subscribe(firstObserver);
randomRelay.subscribe(secondObserver);
randomRelay.accept(5);
if(firstObserver.values().isEmpty()) {
secondObserver.assertValue(5);
} else {
firstObserver.assertValue(5);
secondObserver.assertEmpty();
}
}
}

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package com.baeldung.rxjava.jdbc;
import static org.assertj.core.api.Assertions.assertThat;
import java.util.List;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.github.davidmoten.rx.jdbc.ConnectionProvider;
import com.github.davidmoten.rx.jdbc.Database;
import rx.Observable;
public class AutomapClassIntegrationTest {
private ConnectionProvider connectionProvider = Connector.connectionProvider;
private Database db = Database.from(connectionProvider);
private Observable<Integer> create = null;
private Observable<Integer> insert1, insert2 = null;
@Before
public void setup() {
create = db.update("CREATE TABLE IF NOT EXISTS MANAGER(id int primary key, name varchar(255))")
.count();
insert1 = db.update("INSERT INTO MANAGER(id, name) VALUES(1, 'Alan')")
.dependsOn(create)
.count();
insert2 = db.update("INSERT INTO MANAGER(id, name) VALUES(2, 'Sarah')")
.dependsOn(create)
.count();
}
@Test
public void whenSelectManagersAndAutomap_thenCorrect() {
List<Manager> managers = db.select("select id, name from MANAGER")
.dependsOn(create)
.dependsOn(insert1)
.dependsOn(insert2)
.autoMap(Manager.class)
.toList()
.toBlocking()
.single();
assertThat(managers.get(0)
.getId()).isEqualTo(1);
assertThat(managers.get(0)
.getName()).isEqualTo("Alan");
assertThat(managers.get(1)
.getId()).isEqualTo(2);
assertThat(managers.get(1)
.getName()).isEqualTo("Sarah");
}
@After
public void close() {
db.update("DROP TABLE MANAGER")
.dependsOn(create);
connectionProvider.close();
}
}

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package com.baeldung.rxjava.jdbc;
import static org.assertj.core.api.Assertions.assertThat;
import java.util.List;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.github.davidmoten.rx.jdbc.ConnectionProvider;
import com.github.davidmoten.rx.jdbc.Database;
import rx.Observable;
public class AutomapInterfaceIntegrationTest {
private ConnectionProvider connectionProvider = Connector.connectionProvider;
private Database db = Database.from(connectionProvider);
private Observable<Integer> truncate = null;
private Observable<Integer> insert1, insert2 = null;
@Before
public void setup() {
Observable<Integer> create = db.update("CREATE TABLE IF NOT EXISTS EMPLOYEE(id int primary key, name varchar(255))")
.count();
truncate = db.update("TRUNCATE TABLE EMPLOYEE")
.dependsOn(create)
.count();
insert1 = db.update("INSERT INTO EMPLOYEE(id, name) VALUES(1, 'Alan')")
.dependsOn(truncate)
.count();
insert2 = db.update("INSERT INTO EMPLOYEE(id, name) VALUES(2, 'Sarah')")
.dependsOn(insert1)
.count();
}
@Test
public void whenSelectFromTableAndAutomap_thenCorrect() {
List<Employee> employees = db.select("select id, name from EMPLOYEE")
.dependsOn(insert2)
.autoMap(Employee.class)
.toList()
.toBlocking()
.single();
assertThat(employees.get(0)
.id()).isEqualTo(1);
assertThat(employees.get(0)
.name()).isEqualTo("Alan");
assertThat(employees.get(1)
.id()).isEqualTo(2);
assertThat(employees.get(1)
.name()).isEqualTo("Sarah");
}
@After
public void close() {
db.update("DROP TABLE EMPLOYEE")
.dependsOn(truncate);
connectionProvider.close();
}
}

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package com.baeldung.rxjava.jdbc;
import static org.junit.Assert.assertEquals;
import java.util.Arrays;
import java.util.List;
import org.junit.After;
import org.junit.Test;
import com.github.davidmoten.rx.jdbc.ConnectionProvider;
import com.github.davidmoten.rx.jdbc.Database;
import rx.Observable;
public class BasicQueryTypesIntegrationTest {
private ConnectionProvider connectionProvider = Connector.connectionProvider;
private Database db = Database.from(connectionProvider);
private Observable<Integer> create;
@Test
public void whenCreateTableAndInsertRecords_thenCorrect() {
create = db.update("CREATE TABLE IF NOT EXISTS EMPLOYEE_TABLE(id int primary key, name varchar(255))")
.count();
Observable<Integer> insert1 = db.update("INSERT INTO EMPLOYEE_TABLE(id, name) VALUES(1, 'John')")
.dependsOn(create)
.count();
Observable<Integer> update = db.update("UPDATE EMPLOYEE_TABLE SET name = 'Alan' WHERE id = 1")
.dependsOn(create)
.count();
Observable<Integer> insert2 = db.update("INSERT INTO EMPLOYEE_TABLE(id, name) VALUES(2, 'Sarah')")
.dependsOn(create)
.count();
Observable<Integer> insert3 = db.update("INSERT INTO EMPLOYEE_TABLE(id, name) VALUES(3, 'Mike')")
.dependsOn(create)
.count();
Observable<Integer> delete = db.update("DELETE FROM EMPLOYEE_TABLE WHERE id = 2")
.dependsOn(create)
.count();
List<String> names = db.select("select name from EMPLOYEE_TABLE where id < ?")
.parameter(3)
.dependsOn(create)
.dependsOn(insert1)
.dependsOn(insert2)
.dependsOn(insert3)
.dependsOn(update)
.dependsOn(delete)
.getAs(String.class)
.toList()
.toBlocking()
.single();
assertEquals(Arrays.asList("Alan"), names);
}
@After
public void close() {
db.update("DROP TABLE EMPLOYEE_TABLE")
.dependsOn(create);
connectionProvider.close();
}
}

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package com.baeldung.rxjava.jdbc;
import static org.junit.Assert.assertEquals;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.github.davidmoten.rx.jdbc.ConnectionProvider;
import com.github.davidmoten.rx.jdbc.Database;
import rx.Observable;
public class InsertBlobIntegrationTest {
private ConnectionProvider connectionProvider = Connector.connectionProvider;
private Database db = Database.from(connectionProvider);
private String expectedDocument = null;
private String actualDocument = null;
private Observable<Integer> create, insert = null;
@Before
public void setup() throws IOException {
create = db.update("CREATE TABLE IF NOT EXISTS SERVERLOG (id int primary key, document BLOB)")
.count();
InputStream actualInputStream = new FileInputStream("src/test/resources/actual_clob");
this.actualDocument = Utils.getStringFromInputStream(actualInputStream);
byte[] bytes = this.actualDocument.getBytes(StandardCharsets.UTF_8);
InputStream expectedInputStream = new FileInputStream("src/test/resources/expected_clob");
this.expectedDocument = Utils.getStringFromInputStream(expectedInputStream);
this.insert = db.update("insert into SERVERLOG(id,document) values(?,?)")
.parameter(1)
.parameter(Database.toSentinelIfNull(bytes))
.dependsOn(create)
.count();
}
@Test
public void whenInsertBLOB_thenCorrect() throws IOException {
db.select("select document from SERVERLOG where id = 1")
.dependsOn(create)
.dependsOn(insert)
.getAs(String.class)
.toList()
.toBlocking()
.single();
assertEquals(expectedDocument, actualDocument);
}
@After
public void close() {
db.update("DROP TABLE SERVERLOG")
.dependsOn(create);
connectionProvider.close();
}
}

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package com.baeldung.rxjava.jdbc;
import static org.junit.Assert.assertEquals;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.github.davidmoten.rx.jdbc.ConnectionProvider;
import com.github.davidmoten.rx.jdbc.Database;
import rx.Observable;
public class InsertClobIntegrationTest {
private ConnectionProvider connectionProvider = Connector.connectionProvider;
private Database db = Database.from(connectionProvider);
private String expectedDocument = null;
private String actualDocument = null;
private Observable<Integer> create, insert = null;
@Before
public void setup() throws IOException {
create = db.update("CREATE TABLE IF NOT EXISTS SERVERLOG_TABLE (id int primary key, document CLOB)")
.count();
InputStream actualInputStream = new FileInputStream("src/test/resources/actual_clob");
this.actualDocument = Utils.getStringFromInputStream(actualInputStream);
InputStream expectedInputStream = new FileInputStream("src/test/resources/expected_clob");
this.expectedDocument = Utils.getStringFromInputStream(expectedInputStream);
this.insert = db.update("insert into SERVERLOG_TABLE(id,document) values(?,?)")
.parameter(1)
.parameter(Database.toSentinelIfNull(actualDocument))
.dependsOn(create)
.count();
}
@Test
public void whenSelectCLOB_thenCorrect() throws IOException {
db.select("select document from SERVERLOG_TABLE where id = 1")
.dependsOn(create)
.dependsOn(insert)
.getAs(String.class)
.toList()
.toBlocking()
.single();
assertEquals(expectedDocument, actualDocument);
}
@After
public void close() {
db.update("DROP TABLE SERVERLOG_TABLE")
.dependsOn(create);
connectionProvider.close();
}
}

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package com.baeldung.rxjava.jdbc;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.github.davidmoten.rx.jdbc.ConnectionProvider;
import com.github.davidmoten.rx.jdbc.Database;
import rx.Observable;
public class ReturnKeysIntegrationTest {
private Observable<Boolean> begin = null;
private Observable<Integer> createStatement = null;
private ConnectionProvider connectionProvider = Connector.connectionProvider;
private Database db = Database.from(connectionProvider);
@Before
public void setup() {
begin = db.beginTransaction();
createStatement = db.update("CREATE TABLE IF NOT EXISTS EMPLOYEE_SAMPLE(id int auto_increment primary key, name varchar(255))")
.dependsOn(begin)
.count();
}
@Test
public void whenInsertAndReturnGeneratedKey_thenCorrect() {
Integer key = db.update("INSERT INTO EMPLOYEE_SAMPLE(name) VALUES('John')")
.dependsOn(createStatement)
.returnGeneratedKeys()
.getAs(Integer.class)
.count()
.toBlocking()
.single();
assertThat(key).isEqualTo(1);
}
@After
public void close() {
db.update("DROP TABLE EMPLOYEE_SAMPLE")
.dependsOn(createStatement);
connectionProvider.close();
}
}

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package com.baeldung.rxjava.jdbc;
import static org.junit.Assert.assertEquals;
import org.junit.After;
import org.junit.Test;
import com.github.davidmoten.rx.jdbc.ConnectionProvider;
import com.github.davidmoten.rx.jdbc.Database;
import rx.Observable;
public class TransactionIntegrationTest {
private Observable<Integer> createStatement = null;
private ConnectionProvider connectionProvider = Connector.connectionProvider;
private Database db = Database.from(connectionProvider);
@Test
public void whenCommitTransaction_thenRecordUpdated() {
Observable<Boolean> begin = db.beginTransaction();
Observable<Integer> createStatement = db
.update("CREATE TABLE IF NOT EXISTS EMPLOYEE(id int primary key, name varchar(255))")
.dependsOn(begin)
.count();
Observable<Integer> truncateStatement = db.update("TRUNCATE TABLE EMPLOYEE")
.dependsOn(createStatement)
.count();
Observable<Integer> insertStatement = db.update("INSERT INTO EMPLOYEE(id, name) VALUES(1, 'John')")
.dependsOn(truncateStatement)
.count();
Observable<Integer> updateStatement = db.update("UPDATE EMPLOYEE SET name = 'Tom' WHERE id = 1")
.dependsOn(insertStatement)
.count();
Observable<Boolean> commit = db.commit(updateStatement);
String name = db.select("select name from EMPLOYEE WHERE id = 1")
.dependsOn(commit)
.getAs(String.class)
.toBlocking()
.single();
assertEquals("Tom", name);
}
@After
public void close() {
db.update("DROP TABLE EMPLOYEE")
.dependsOn(createStatement);
connectionProvider.close();
}
}

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