rx.Observable.filter()方法的使用及代码示例

x33g5p2x  于2022-01-25 转载在 其他  
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本文整理了Java中rx.Observable.filter()方法的一些代码示例，展示了Observable.filter()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Observable.filter()方法的具体详情如下：
包路径：rx.Observable
类名称：Observable
方法名：filter

Observable.filter介绍

[英]Filters items emitted by an Observable by only emitting those that satisfy a specified predicate.

Scheduler: filter does not operate by default on a particular Scheduler.
[中]通过仅发送满足指定谓词的项来过滤可观察项发出的项。
调度程序：默认情况下，过滤器不会在特定调度程序上运行。

代码示例

代码示例来源：origin: RichardWarburton/java-8-lambdas-exercises

  1. public Observable<Artist> search(String searchedName,
  2.                  String searchedNationality,
  3.                  int maxResults) {
  5.   return getSavedArtists()  // <1>
  6.      .filter(name -> name.contains(searchedName)) // <2>
  7.      .flatMap(this::lookupArtist) // <3>
  8.      .filter(artist -> artist.getNationality() // <4>
  9.                  .contains(searchedNationality))
  10.      .take(maxResults); // <5>
  11. }
  12.   // END search

代码示例来源：origin: konmik/nucleus

  1. @Override
  2.   public Observable<Delivery<View, T>> call(Observable<T> observable) {
  3.     return Observable
  4.       .combineLatest(
  5.         view,
  6.         observable
  7.           .materialize()
  8.           .filter(new Func1<Notification<T>, Boolean>() {
  9.             @Override
  10.             public Boolean call(Notification<T> notification) {
  11.               return !notification.isOnCompleted();
  12.             }
  13.           }),
  14.         new Func2<View, Notification<T>, Delivery<View, T>>() {
  15.           @Override
  16.           public Delivery<View, T> call(View view, Notification<T> notification) {
  17.             return view == null ? null : new Delivery<>(view, notification);
  18.           }
  19.         })
  20.       .filter(new Func1<Delivery<View, T>, Boolean>() {
  21.         @Override
  22.         public Boolean call(Delivery<View, T> delivery) {
  23.           return delivery != null;
  24.         }
  25.       });
  26.   }
  27. }

代码示例来源：origin: amitshekhariitbhu/Fast-Android-Networking

  1. .filter(new Func1<User, Boolean>() {
  2.   @Override
  3.   public Boolean call(User user) {

代码示例来源：origin: HotBitmapGG/bilibili-android-client

  1. private void search() {
  2.   RxView.clicks(mSearchBtn)
  3.       .throttleFirst(2, TimeUnit.SECONDS)
  4.       .map(aVoid -> mSearchEdit.getText().toString().trim())
  5.       .filter(s -> !TextUtils.isEmpty(s))
  6.       .observeOn(AndroidSchedulers.mainThread())
  7.       .subscribe(s -> {
  8.         KeyBoardUtil.closeKeybord(mSearchEdit, TotalStationSearchActivity.this);
  9.         showSearchAnim();
  10.         clearData();
  11.         content = s;
  12.         getSearchData();
  13.       });
  14. }

代码示例来源：origin: HotBitmapGG/bilibili-android-client

  1. .filter(integer -> !TextUtils.isEmpty(mSearchEdit.getText().toString().trim()))
  2. .filter(integer -> integer == EditorInfo.IME_ACTION_SEARCH)
  3. .flatMap(new Func1<Integer, Observable<String>>() {
  4.   @Override

代码示例来源：origin: Rukey7/MvpApp

  1. /**
  2.  * 先进行初始化，把之前下载的图片记录下来
  3.  * @param dbDao
  4.  */
  5. public static void init(BeautyPhotoInfoDao dbDao) {
  6.   dbDao.queryBuilder().rx().list()
  7.       .subscribeOn(Schedulers.io())
  8.       .flatMap(new Func1<List<BeautyPhotoInfo>, Observable<BeautyPhotoInfo>>() {
  9.         @Override
  10.         public Observable<BeautyPhotoInfo> call(List<BeautyPhotoInfo> photoList) {
  11.           return Observable.from(photoList);
  12.         }
  13.       })
  14.       .filter(new Func1<BeautyPhotoInfo, Boolean>() {
  15.         @Override
  16.         public Boolean call(BeautyPhotoInfo bean) {
  17.           return bean.isDownload();
  18.         }
  19.       })
  20.       .subscribe(new Action1<BeautyPhotoInfo>() {
  21.         @Override
  22.         public void call(BeautyPhotoInfo bean) {
  23.           sDlPhotos.put(bean.getImgsrc().hashCode(), true);
  24.         }
  25.       });
  26. }

代码示例来源：origin: apache/usergrid

  1. public Observable<MarkedEdge> repair( final ApplicationScope scope, final MarkedEdge edge, final UUID timestamp ) {
  2.   //merge source and target then deal with the distinct values
  3.   return Observable.just( edge ).filter( markedEdge-> markedEdge.isDeleted() )
  4.       .doOnNext( markedEdge -> {
  5.           //it's still in the same state as it was when we queued it. Remove it
  6.           if(logger.isDebugEnabled()){
  7.             logger.debug( "Removing edge {} ", markedEdge );
  8.           }
  9.           //remove from the commit log
  10.           //remove from storage
  11.           try {
  12.             storageSerialization.deleteEdge( scope, markedEdge, timestamp ).execute();
  13.           }
  14.           catch ( ConnectionException e ) {
  15.             throw new RuntimeException( "Unable to connect to casandra", e );
  16.           }
  17.         }
  18.      );
  19. }

代码示例来源：origin: Rukey7/MvpApp

  1. .subscribeOn(Schedulers.io())
  2. .observeOn(AndroidSchedulers.mainThread())
  3. .filter(new Func1<NewsTypeInfo, Boolean>() {
  4.   @Override
  5.   public Boolean call(NewsTypeInfo newsTypeBean) {

代码示例来源：origin: Rukey7/MvpApp

  1. @Override
  2. public void getData(boolean isRefresh) {
  3.   mDbDao.queryBuilder().rx()
  4.       .oneByOne()
  5.       .filter(new Func1<VideoInfo, Boolean>() {
  6.         @Override
  7.         public Boolean call(VideoInfo info) {
  8.           // 判断是否存于下载中
  9.           return (info.getDownloadStatus() != DownloadStatus.NORMAL &&
  10.               info.getDownloadStatus() != DownloadStatus.COMPLETE);
  11.         }
  12.       })
  13.       .toList()
  14.       .observeOn(AndroidSchedulers.mainThread())
  15.       .subscribe(new Action1<List<VideoInfo>>() {
  16.         @Override
  17.         public void call(List<VideoInfo> videoList) {
  18.           if (ListUtils.isEmpty(videoList)) {
  19.             mView.noData();
  20.           } else {
  21.             mView.loadData(videoList);
  22.           }
  23.         }
  24.       });
  25. }

代码示例来源：origin: apache/usergrid

  1. @Override
  2. public Observable<Edge> deleteEdge( final Edge edge ) {
  3.   GraphValidation.validateEdge( edge );
  4.   final UUID startTimestamp = UUIDGenerator.newTimeUUID();
  5.   final Observable<Edge> observable =
  6.     Observable.create( new ObservableIterator<MarkedEdge>( "read edge versions" ) {
  7.       @Override
  8.       protected Iterator<MarkedEdge> getIterator() {
  9.         return storageEdgeSerialization.getEdgeVersions( scope,
  10.           new SimpleSearchByEdge( edge.getSourceNode(), edge.getType(), edge.getTargetNode(),
  11.             Long.MAX_VALUE, SearchByEdgeType.Order.DESCENDING, Optional.absent() ) );
  12.       }
  13.     } ).filter( markedEdge -> markedEdge.isDeleted() ).flatMap( marked ->
  14.       //fire our delete listener and wait for the results
  15.       edgeDeleteListener.receive( scope, marked, startTimestamp ).doOnNext(
  16.         //log them
  17.         count -> logger.trace( "removed {} types for edge {} ", count, edge ) )
  18.         //return the marked edge
  19.         .map( count -> marked ) );
  20.   return ObservableTimer.time( observable, deleteEdgeTimer );
  21. }

代码示例来源：origin: konmik/nucleus

  1. final Subscription subscription = observable
  2.   .materialize()
  3.   .filter(new Func1<Notification<T>, Boolean>() {
  4.     @Override
  5.     public Boolean call(Notification<T> notification) {

代码示例来源：origin: konmik/nucleus

  1. @Override
  2.   public Observable<Delivery<View, T>> call(Observable<T> observable) {
  3.     return observable.materialize()
  4.       .take(1)
  5.       .switchMap(new Func1<Notification<T>, Observable<? extends Delivery<View, T>>>() {
  6.         @Override
  7.         public Observable<? extends Delivery<View, T>> call(final Notification<T> notification) {
  8.           return view.map(new Func1<View, Delivery<View, T>>() {
  9.             @Override
  10.             public Delivery<View, T> call(View view) {
  11.               return view == null ? null : new Delivery<>(view, notification);
  12.             }
  13.           });
  14.         }
  15.       })
  16.       .filter(new Func1<Delivery<View, T>, Boolean>() {
  17.         @Override
  18.         public Boolean call(Delivery<View, T> delivery) {
  19.           return delivery != null;
  20.         }
  21.       })
  22.       .take(1);
  23.   }
  24. }

代码示例来源：origin: apache/usergrid

  1. private Observable.Transformer<IndexOperationMessage, IndexOperationMessage> applyCollector(AsyncEventQueueType queueType) {
  2.   return observable -> observable
  3.     .collect(() -> new IndexOperationMessage(), (collector, single) -> collector.ingest(single))
  4.     .filter(msg -> !msg.isEmpty())
  5.     .doOnNext(indexOperation -> {
  6.       asyncEventService.queueIndexOperationMessage(indexOperation, queueType);
  7.     });
  8. }

代码示例来源：origin: apache/usergrid

  1. private Observable.Transformer<IndexOperationMessage, IndexOperationMessage> applyCollector(AsyncEventQueueType queueType) {
  2.   return observable -> observable
  3.     .collect(() -> new IndexOperationMessage(), (collector, single) -> collector.ingest(single))
  4.     .filter(msg -> !msg.isEmpty())
  5.     .doOnNext(indexOperation -> {
  6.       asyncEventService.queueIndexOperationMessage(indexOperation, queueType);
  7.     });
  8. }

代码示例来源：origin: apache/usergrid

  1. .filter(id -> {
  2.   final String type = InflectionUtils.pluralize(((Id) id).getType());
  3.   return ! (type.equals(Schema.COLLECTION_USERS)

代码示例来源：origin: apache/usergrid

  1. /**
  2.  * Use Graph to get old appinfos from the old and deprecated System App.
  3.  */
  4. public Observable<org.apache.usergrid.persistence.model.entity.Entity> getOldAppInfos() {
  5.   final ApplicationScope systemAppScope = getApplicationScope( SYSTEM_APP_ID );
  6.   final EntityCollectionManager systemCollectionManager =
  7.     entityCollectionManagerFactory.createCollectionManager( systemAppScope );
  8.   final GraphManager gm = graphManagerFactory.createEdgeManager( systemAppScope );
  9.   String edgeType = CpNamingUtils.getEdgeTypeFromCollectionName( "appinfos" );
  10.   Id rootAppId = systemAppScope.getApplication();
  11.   final SimpleSearchByEdgeType simpleSearchByEdgeType =
  12.     new SimpleSearchByEdgeType( rootAppId, edgeType, Long.MAX_VALUE, SearchByEdgeType.Order.DESCENDING,
  13.       Optional.absent() );
  14.   Observable<org.apache.usergrid.persistence.model.entity.Entity> entityObs =
  15.     gm.loadEdgesFromSource( simpleSearchByEdgeType ).flatMap( edge -> {
  16.       final Id appInfoId = edge.getTargetNode();
  17.       return systemCollectionManager.load( appInfoId ).filter( entity -> ( entity != null ) );
  18.     } );
  19.   return entityObs;
  20. }

代码示例来源：origin: apache/usergrid

  1. @Override
  2. public Observable<IndexOperationMessage> buildEntityIndex( final EntityIndexOperation entityIndexOperation ) {
  3.   final ApplicationScope applicationScope = entityIndexOperation.getApplicationScope();
  4.   final Id entityId = entityIndexOperation.getId();
  5.   //load the entity
  6.   return entityCollectionManagerFactory.createCollectionManager( applicationScope ).load( entityId ).filter(
  7.     entity -> {
  8.       final Field<Long> modified = entity.getField( Schema.PROPERTY_MODIFIED );
  9.       /**
  10.        * We don't have a modified field, so we can't check, pass it through
  11.        */
  12.       if ( modified == null ) {
  13.         return true;
  14.       }
  15.       //entityIndexOperation.getUpdatedSince will always be 0 except for reindexing the application
  16.       //only re-index if it has been updated and been updated after our timestamp
  17.       return modified.getValue() >= entityIndexOperation.getUpdatedSince();
  18.     } )
  19.     //perform indexing on the task scheduler and start it
  20.     .flatMap( entity -> indexService.indexEntity( applicationScope, entity ) );
  21. }

代码示例来源：origin: apache/usergrid

  1. /**
  2.  * Tests that reduce emits
  3.  */
  4. @Test
  5. public void testReduceEmpty(){
  6.   final int result =  Observable.range( 0, 100 ).filter( value -> value == -1 ).reduce( 0, ( integer, integer2 ) -> integer + 1 ).toBlocking().last();
  7.   assertEquals(0, result);
  8. }

代码示例来源：origin: ReactiveX/RxNetty

  1. @Override
  2.   public void call(Subscriber<? super Connection<R, W>> subscriber) {
  3.     if (isShutdown) {
  4.       subscriber.onError(new IllegalStateException("Connection provider is shutdown."));
  5.     }
  6.     idleConnectionsHolder.pollThisEventLoopConnections()
  7.                .concatWith(connectIfAllowed())
  8.                .filter(new Func1<PooledConnection<R, W>, Boolean>() {
  9.                  @Override
  10.                  public Boolean call(PooledConnection<R, W> c) {
  11.                    boolean isUsable = c.isUsable();
  12.                    if (!isUsable) {
  13.                      discardNow(c);
  14.                    }
  15.                    return isUsable;
  16.                  }
  17.                })
  18.                .take(1)
  19.                .lift(new ReuseSubscriberLinker())
  20.                .lift(new ConnectMetricsOperator())
  21.                .unsafeSubscribe(subscriber);
  22.   }
  23. });

代码示例来源：origin: apache/usergrid

  1. /**
  2.  * TODO: Use Graph to get application_info for an specified Application.
  3.  */
  4. private org.apache.usergrid.persistence.Entity getApplicationInfo( final UUID appId ) throws Exception {
  5.   final ApplicationScope managementAppScope = getApplicationScope( CpNamingUtils.MANAGEMENT_APPLICATION_ID );
  6.   final EntityCollectionManager managementCollectionManager =
  7.     entityCollectionManagerFactory.createCollectionManager( managementAppScope );
  8.   Observable<MarkedEdge> edgesObservable = getApplicationInfoEdges( appId );
  9.   //get the graph for all app infos
  10.   Observable<org.apache.usergrid.persistence.model.entity.Entity> entityObs = edgesObservable.flatMap( edge -> {
  11.     final Id appInfoId = edge.getTargetNode();
  12.     return managementCollectionManager.load( appInfoId ).filter( entity -> {
  13.       //check for app id
  14.       return entity != null ? entity.getId().getUuid().equals( appId ) : false;
  15.     } );
  16.   } );
  17.   // don't expect many applications, so we block
  18.   org.apache.usergrid.persistence.model.entity.Entity applicationInfo =
  19.     entityObs.toBlocking().lastOrDefault( null );
  20.   if ( applicationInfo == null ) {
  21.     return null;
  22.   }
  23.   Class clazz = Schema.getDefaultSchema().getEntityClass( applicationInfo.getId().getType() );
  24.   org.apache.usergrid.persistence.Entity entity =
  25.     EntityFactory.newEntity( applicationInfo.getId().getUuid(), applicationInfo.getId().getType(), clazz );
  26.   entity.setProperties( CpEntityMapUtils.toMap( applicationInfo ) );
  27.   return entity;
  28. }

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