Create a configuration class for SdkPublisher#split

core/sdk-core/src/main/java/software/amazon/awssdk/core/async/AsyncRequestBody.java

@@ -25,6 +25,7 @@
 import java.util.Arrays;
 import java.util.Optional;
 import java.util.concurrent.ExecutorService;
+import java.util.function.Consumer;
 import org.reactivestreams.Publisher;
 import org.reactivestreams.Subscriber;
 import software.amazon.awssdk.annotations.SdkPublicApi;
@@ -405,34 +406,36 @@ static AsyncRequestBody empty() {
 
     /**
      * Converts this {@link AsyncRequestBody} to a publisher of {@link AsyncRequestBody}s, each of which publishes a specific
-     * portion of the original data, based on the configured {code chunkSizeInBytes}.
+     * portion of the original data, based on the provided {@link AsyncRequestBodySplitConfiguration}. The default chunk size
+     * is 2MB and the default buffer size is 8MB.
      *
      * <p>
      * If content length of this {@link AsyncRequestBody} is present, each divided {@link AsyncRequestBody} is delivered to the
      * subscriber right after it's initialized.
      * <p>
-     * // TODO: API Surface Area review: should we make this behavior configurable?
      * If content length is null, it is sent after the entire content for that chunk is buffered.
      * In this case, the configured {@code maxMemoryUsageInBytes} must be larger than or equal to {@code chunkSizeInBytes}.
      *
-     * @param chunkSizeInBytes      the size for each divided chunk. The last chunk may be smaller than the configured size.
-     * @param maxMemoryUsageInBytes the max memory the SDK will use to buffer the content
-     * @return SplitAsyncRequestBodyResult
+     * @see AsyncRequestBodySplitConfiguration
      */
-    default SdkPublisher<AsyncRequestBody> split(long chunkSizeInBytes, long maxMemoryUsageInBytes) {
-        Validate.isPositive(chunkSizeInBytes, "chunkSizeInBytes");
-        Validate.isPositive(maxMemoryUsageInBytes, "maxMemoryUsageInBytes");
-
-        if (!contentLength().isPresent()) {
-            Validate.isTrue(maxMemoryUsageInBytes >= chunkSizeInBytes,
-                            "maxMemoryUsageInBytes must be larger than or equal to " +
-                            "chunkSizeInBytes if the content length is unknown");
-        }
+    default SdkPublisher<AsyncRequestBody> split(AsyncRequestBodySplitConfiguration splitConfiguration) {
+        Validate.notNull(splitConfiguration, "splitConfiguration");
 
         return SplittingPublisher.builder()
                                  .asyncRequestBody(this)
-                                 .chunkSizeInBytes(chunkSizeInBytes)
-                                 .maxMemoryUsageInBytes(maxMemoryUsageInBytes)
+                                 .chunkSizeInBytes(splitConfiguration.chunkSizeInBytes())
+                                 .bufferSizeInBytes(splitConfiguration.bufferSizeInBytes())
                                  .build();
     }
+
+    /**
+     * This is a convenience method that passes an instance of the {@link AsyncRequestBodySplitConfiguration} builder,
+     * avoiding the need to create one manually via {@link AsyncRequestBodySplitConfiguration#builder()}.
+     *
+     * @see #split(AsyncRequestBodySplitConfiguration)
+     */
+    default SdkPublisher<AsyncRequestBody> split(Consumer<AsyncRequestBodySplitConfiguration.Builder> splitConfiguration) {
+        Validate.notNull(splitConfiguration, "splitConfiguration");
+        return split(AsyncRequestBodySplitConfiguration.builder().applyMutation(splitConfiguration).build());
+    }
 }

core/sdk-core/src/main/java/software/amazon/awssdk/core/async/AsyncRequestBodySplitConfiguration.java

@@ -0,0 +1,141 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * You may not use this file except in compliance with the License.
+ * A copy of the License is located at
+ *
+ *  http://aws.amazon.com/apache2.0
+ *
+ * or in the "license" file accompanying this file. This file 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 software.amazon.awssdk.core.async;
+
+import java.util.Objects;
+import software.amazon.awssdk.annotations.SdkPublicApi;
+import software.amazon.awssdk.utils.Validate;
+import software.amazon.awssdk.utils.builder.CopyableBuilder;
+import software.amazon.awssdk.utils.builder.ToCopyableBuilder;
+
+/**
+ * Configuration options for {@link AsyncRequestBody#split} to configure how the SDK
+ * should split an {@link SdkPublisher}.
+ */
+@SdkPublicApi
+public final class AsyncRequestBodySplitConfiguration implements ToCopyableBuilder<AsyncRequestBodySplitConfiguration.Builder,
+    AsyncRequestBodySplitConfiguration> {
+    private final Long chunkSizeInBytes;
+    private final Long bufferSizeInBytes;
+
+    private AsyncRequestBodySplitConfiguration(DefaultBuilder builder) {
+        this.chunkSizeInBytes = Validate.isPositiveOrNull(builder.chunkSizeInBytes, "chunkSizeInBytes");
+        this.bufferSizeInBytes = Validate.isPositiveOrNull(builder.bufferSizeInBytes, "bufferSizeInBytes");
+    }
+
+    /**
+     * The configured chunk size for each divided {@link AsyncRequestBody}.
+     */
+    public Long chunkSizeInBytes() {
+        return chunkSizeInBytes;
+    }
+
+    /**
+     * The configured maximum buffer size the SDK will use to buffer the content from the source {@link SdkPublisher}.
+     */
+    public Long bufferSizeInBytes() {
+        return bufferSizeInBytes;
+    }
+
+    /**
+     * Create a {@link Builder}, used to create a {@link AsyncRequestBodySplitConfiguration}.
+     */
+    public static Builder builder() {
+        return new DefaultBuilder();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+
+        AsyncRequestBodySplitConfiguration that = (AsyncRequestBodySplitConfiguration) o;
+
+        if (!Objects.equals(chunkSizeInBytes, that.chunkSizeInBytes)) {
+            return false;
+        }
+        return Objects.equals(bufferSizeInBytes, that.bufferSizeInBytes);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = chunkSizeInBytes != null ? chunkSizeInBytes.hashCode() : 0;
+        result = 31 * result + (bufferSizeInBytes != null ? bufferSizeInBytes.hashCode() : 0);
+        return result;
+    }
+
+    @Override
+    public AsyncRequestBodySplitConfiguration.Builder toBuilder() {
+        return new DefaultBuilder(this);
+    }
+
+    public interface Builder extends CopyableBuilder<AsyncRequestBodySplitConfiguration.Builder,
+        AsyncRequestBodySplitConfiguration>  {
+
+        /**
+         * Configures the size for each divided chunk. The last chunk may be smaller than the configured size. The default value
+         * is 2MB.
+         *
+         * @param chunkSizeInBytes the chunk size in bytes
+         * @return This object for method chaining.
+         */
+        Builder chunkSizeInBytes(Long chunkSizeInBytes);
+
+        /**
+         * The maximum buffer size the SDK will use to buffer the content from the source {@link SdkPublisher}. The default value
+         * is 8MB.
+         *
+         * @param bufferSizeInBytes the buffer size in bytes
+         * @return This object for method chaining.
+         */
+        Builder bufferSizeInBytes(Long bufferSizeInBytes);
+    }
+
+    private static final class DefaultBuilder implements Builder {
+        private Long chunkSizeInBytes;
+        private Long bufferSizeInBytes;
+
+        private DefaultBuilder(AsyncRequestBodySplitConfiguration asyncRequestBodySplitConfiguration) {
+            this.chunkSizeInBytes = asyncRequestBodySplitConfiguration.chunkSizeInBytes;
+            this.bufferSizeInBytes = asyncRequestBodySplitConfiguration.bufferSizeInBytes;
+        }
+
+        private DefaultBuilder() {
+
+        }
+
+        @Override
+        public Builder chunkSizeInBytes(Long chunkSizeInBytes) {
+            this.chunkSizeInBytes = chunkSizeInBytes;
+            return this;
+        }
+
+        @Override
+        public Builder bufferSizeInBytes(Long bufferSizeInBytes) {
+            this.bufferSizeInBytes = bufferSizeInBytes;
+            return this;
+        }
+
+        @Override
+        public AsyncRequestBodySplitConfiguration build() {
+            return new AsyncRequestBodySplitConfiguration(this);
+        }
+    }
+}

core/sdk-core/src/main/java/software/amazon/awssdk/core/internal/async/SplittingPublisher.java

@@ -39,17 +39,25 @@
 @SdkInternalApi
 public class SplittingPublisher implements SdkPublisher<AsyncRequestBody> {
     private static final Logger log = Logger.loggerFor(SplittingPublisher.class);
+    private static final long DEFAULT_CHUNK_SIZE = 2 * 1024 * 1024L;
+    private static final long DEFAULT_BUFFER_SIZE = DEFAULT_CHUNK_SIZE * 4;
     private final AsyncRequestBody upstreamPublisher;
     private final SplittingSubscriber splittingSubscriber;
     private final SimplePublisher<AsyncRequestBody> downstreamPublisher = new SimplePublisher<>();
     private final long chunkSizeInBytes;
-    private final long maxMemoryUsageInBytes;
+    private final long bufferSizeInBytes;
 
     private SplittingPublisher(Builder builder) {
         this.upstreamPublisher =  Validate.paramNotNull(builder.asyncRequestBody, "asyncRequestBody");
-        this.chunkSizeInBytes = Validate.isPositive(builder.chunkSizeInBytes, "chunkSizeInBytes");
+        this.chunkSizeInBytes = builder.chunkSizeInBytes == null ? DEFAULT_CHUNK_SIZE :  builder.chunkSizeInBytes;
+        this.bufferSizeInBytes = builder.bufferSizeInBytes == null ? DEFAULT_BUFFER_SIZE : builder.bufferSizeInBytes;
         this.splittingSubscriber = new SplittingSubscriber(upstreamPublisher.contentLength().orElse(null));
-        this.maxMemoryUsageInBytes = Validate.isPositive(builder.maxMemoryUsageInBytes, "maxMemoryUsageInBytes");
+
+        if (!upstreamPublisher.contentLength().isPresent()) {
+            Validate.isTrue(bufferSizeInBytes >= chunkSizeInBytes,
+                            "bufferSizeInBytes must be larger than or equal to " +
+                            "chunkSizeInBytes if the content length is unknown");
+        }
     }
 
     public static Builder builder() {
@@ -213,7 +221,7 @@ private void maybeRequestMoreUpstreamData() {
         }
 
         private boolean shouldRequestMoreData(long buffered) {
-            return buffered == 0 || buffered + byteBufferSizeHint <= maxMemoryUsageInBytes;
+            return buffered == 0 || buffered + byteBufferSizeHint <= bufferSizeInBytes;
         }
 
         private Long totalDataRemaining() {
@@ -289,42 +297,20 @@ private void addDataBuffered(int length) {
     public static final class Builder {
         private AsyncRequestBody asyncRequestBody;
         private Long chunkSizeInBytes;
-        private Long maxMemoryUsageInBytes;
+        private Long bufferSizeInBytes;
 
-        /**
-         * Configures the asyncRequestBody to split
-         *
-         * @param asyncRequestBody The new asyncRequestBody value.
-         * @return This object for method chaining.
-         */
         public Builder asyncRequestBody(AsyncRequestBody asyncRequestBody) {
             this.asyncRequestBody = asyncRequestBody;
             return this;
         }
 
-        /**
-         * Configures the size of the chunk for each {@link AsyncRequestBody} to publish
-         *
-         * @param chunkSizeInBytes The new chunkSizeInBytes value.
-         * @return This object for method chaining.
-         */
-        public Builder chunkSizeInBytes(long chunkSizeInBytes) {
+        public Builder chunkSizeInBytes(Long chunkSizeInBytes) {
             this.chunkSizeInBytes = chunkSizeInBytes;
             return this;
         }
 
-        /**
-         * Sets the maximum memory usage in bytes.
-         *
-         * @param maxMemoryUsageInBytes The new maxMemoryUsageInBytes value.
-         * @return This object for method chaining.
-         */
-        // TODO: max memory usage might not be the best name, since we may technically go a little above this limit when we add
-        //  on a new byte buffer. But we don't know for sure what the size of a buffer we request will be (we do use the size
-        //  for the last byte buffer as a hint), so I don't think we can have a truly accurate max. Maybe we call it minimum
-        //  buffer size instead?
-        public Builder maxMemoryUsageInBytes(long maxMemoryUsageInBytes) {
-            this.maxMemoryUsageInBytes = maxMemoryUsageInBytes;
+        public Builder bufferSizeInBytes(Long bufferSizeInBytes) {
+            this.bufferSizeInBytes = bufferSizeInBytes;
             return this;
         }
 

core/sdk-core/src/test/java/software/amazon/awssdk/core/async/AsyncRequestBodyConfigurationTest.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * You may not use this file except in compliance with the License.
+ * A copy of the License is located at
+ *
+ *  http://aws.amazon.com/apache2.0
+ *
+ * or in the "license" file accompanying this file. This file 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 software.amazon.awssdk.core.async;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+import nl.jqno.equalsverifier.EqualsVerifier;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+public class AsyncRequestBodyConfigurationTest {
+
+    @Test
+    void equalsHashCode() {
+        EqualsVerifier.forClass(AsyncRequestBodySplitConfiguration.class)
+                      .verify();
+    }
+
+    @ParameterizedTest
+    @ValueSource(longs = {0, -1})
+    void nonPositiveValue_shouldThrowException(long size) {
+        assertThatThrownBy(() ->
+                               AsyncRequestBodySplitConfiguration.builder()
+                                                                 .chunkSizeInBytes(size)
+                                                                 .build())
+            .hasMessageContaining("must be positive");
+        assertThatThrownBy(() ->
+                               AsyncRequestBodySplitConfiguration.builder()
+                                                                 .bufferSizeInBytes(size)
+                                                                 .build())
+            .hasMessageContaining("must be positive");
+    }
+
+    @Test
+    void toBuilder_shouldCopyAllFields() {
+        AsyncRequestBodySplitConfiguration config = AsyncRequestBodySplitConfiguration.builder()
+                                                                                     .bufferSizeInBytes(1L)
+                                                                                     .chunkSizeInBytes(2L)
+                                                                                     .build();
+
+        assertThat(config.toBuilder().build()).isEqualTo(config);
+    }
+}

core/sdk-core/src/test/java/software/amazon/awssdk/core/async/AsyncRequestBodyTest.java

@@ -356,25 +356,4 @@ void publisherConstructorHasCorrectContentType() {
         AsyncRequestBody requestBody = AsyncRequestBody.fromPublisher(bodyPublisher);
         assertEquals(Mimetype.MIMETYPE_OCTET_STREAM, requestBody.contentType());
     }
-
-    @Test
-    public void split_nonPositiveInput_shouldThrowException() {
-        AsyncRequestBody body = AsyncRequestBody.fromString("test");
-        assertThatThrownBy(() -> body.split(0, 4)).hasMessageContaining("must be positive");
-        assertThatThrownBy(() -> body.split(-1, 4)).hasMessageContaining("must be positive");
-        assertThatThrownBy(() -> body.split(5, 0)).hasMessageContaining("must be positive");
-        assertThatThrownBy(() -> body.split(5, -1)).hasMessageContaining("must be positive");
-    }
-
-    @Test
-    public void split_contentUnknownMaxMemorySmallerThanChunkSize_shouldThrowException() {
-        AsyncRequestBody body = AsyncRequestBody.fromPublisher(new Publisher<ByteBuffer>() {
-            @Override
-            public void subscribe(Subscriber<? super ByteBuffer> s) {
-
-            }
-        });
-        assertThatThrownBy(() -> body.split(10, 4))
-            .hasMessageContaining("must be larger than or equal");
-    }
 }