| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.beam.sdk.testing; |
| |
| import java.io.Serializable; |
| import java.util.Collection; |
| import javax.annotation.Nullable; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.coders.CoderException; |
| import org.apache.beam.sdk.transforms.windowing.BoundedWindow; |
| import org.apache.beam.sdk.util.CoderUtils; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Supplier; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.ImmutableList; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.ImmutableSet; |
| |
| /** |
| * A {@link Supplier} that returns a static set of {@link BoundedWindow BoundedWindows}. The |
| * supplier is {@link Serializable}, and handles encoding and decoding the windows with a {@link |
| * Coder} provided for the windows. |
| */ |
| final class WindowSupplier implements Supplier<Collection<BoundedWindow>>, Serializable { |
| private final Coder<? extends BoundedWindow> coder; |
| private final Collection<byte[]> encodedWindows; |
| |
| /** Access via {@link #get()}. */ |
| @Nullable private transient Collection<BoundedWindow> windows; |
| |
| public static <W extends BoundedWindow> WindowSupplier of(Coder<W> coder, Iterable<W> windows) { |
| ImmutableSet.Builder<byte[]> windowsBuilder = ImmutableSet.builder(); |
| for (W window : windows) { |
| try { |
| windowsBuilder.add(CoderUtils.encodeToByteArray(coder, window)); |
| } catch (CoderException e) { |
| throw new IllegalArgumentException( |
| "Could not encode provided windows with the provided window coder", e); |
| } |
| } |
| return new WindowSupplier(coder, windowsBuilder.build()); |
| } |
| |
| private WindowSupplier(Coder<? extends BoundedWindow> coder, Collection<byte[]> encodedWindows) { |
| this.coder = coder; |
| this.encodedWindows = encodedWindows; |
| } |
| |
| @Override |
| public Collection<BoundedWindow> get() { |
| if (windows == null) { |
| decodeWindows(); |
| } |
| return windows; |
| } |
| |
| private synchronized void decodeWindows() { |
| if (windows == null) { |
| ImmutableList.Builder<BoundedWindow> windowsBuilder = ImmutableList.builder(); |
| for (byte[] encoded : encodedWindows) { |
| try { |
| windowsBuilder.add(CoderUtils.decodeFromByteArray(coder, encoded)); |
| } catch (CoderException e) { |
| throw new IllegalArgumentException( |
| "Could not decode provided windows with the provided window coder", e); |
| } |
| } |
| this.windows = windowsBuilder.build(); |
| } |
| } |
| } |