Adding Benchmark test for Checksums (#5701)

* Adding Benchmark test for Checksums

* Addressed PR comments

* Addressed PR comments

* Checkstyle issue fixed

Author: joviegas

test/sdk-benchmarks/src/main/java/software/amazon/awssdk/benchmark/checksum/ChecksumBenchmark.java

@@ -0,0 +1,131 @@
+/*
+ * 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.benchmark.checksum;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Locale;
+import java.util.concurrent.TimeUnit;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Fork;
+import org.openjdk.jmh.annotations.Level;
+import org.openjdk.jmh.annotations.Measurement;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Param;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.annotations.TearDown;
+import org.openjdk.jmh.annotations.Warmup;
+import org.openjdk.jmh.infra.Blackhole;
+import software.amazon.awssdk.checksums.DefaultChecksumAlgorithm;
+import software.amazon.awssdk.checksums.SdkChecksum;
+
+@State(Scope.Benchmark)
+@Warmup(iterations = 3, time = 15, timeUnit = TimeUnit.SECONDS)
+@Measurement(iterations = 5, time = 10, timeUnit = TimeUnit.SECONDS)
+@Fork(2)
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.NANOSECONDS)
+public class ChecksumBenchmark {
+    @State(Scope.Thread)
+    public static class ChecksumState {
+
+        @Param({"128B", "4KB", "128KB", "1MB"})
+        public String size;
+
+        @Param({"MD5", "CRC32", "CRC32C", "SHA1", "SHA256", "CRC64NVME"})
+        public String checksumProvider;
+
+        private byte[] payload;
+        private SdkChecksum sdkChecksum;
+
+        @Setup(Level.Trial)
+        public void setup() {
+            // Initialize the correct checksum provider based on the parameter
+            switch (checksumProvider.toUpperCase(Locale.ROOT)) {
+                case "MD5":
+                    sdkChecksum = SdkChecksum.forAlgorithm(DefaultChecksumAlgorithm.MD5);
+                    break;
+                case "CRC32":
+                    sdkChecksum = SdkChecksum.forAlgorithm(DefaultChecksumAlgorithm.CRC32);
+                    break;
+                case "CRC32C":
+                    sdkChecksum = SdkChecksum.forAlgorithm(DefaultChecksumAlgorithm.CRC32C);
+                    break;
+                case "SHA1":
+                    sdkChecksum = SdkChecksum.forAlgorithm(DefaultChecksumAlgorithm.SHA1);
+                    break;
+                case "SHA256":
+                    sdkChecksum = SdkChecksum.forAlgorithm(DefaultChecksumAlgorithm.SHA256);
+                    break;
+                case "CRC64NVME":
+                    sdkChecksum = SdkChecksum.forAlgorithm(DefaultChecksumAlgorithm.CRC64NVME);
+                    break;
+
+                default:
+                    throw new IllegalArgumentException("Invalid checksumProvider: " + checksumProvider);
+            }
+            // Initialize the payload based on the size parameter
+            switch (size) {
+                case "128B":
+                    payload = generateStringOfSize(128).getBytes(StandardCharsets.UTF_8);
+                    break;
+                case "4KB":
+                    payload = generateStringOfSize(4 * 1024).getBytes(StandardCharsets.UTF_8);
+                    break;
+                case "128KB":
+                    payload = generateStringOfSize(128 * 1024).getBytes(StandardCharsets.UTF_8);
+                    break;
+                case "1MB":
+                    payload = generateStringOfSize(1000 * 1024).getBytes(StandardCharsets.UTF_8);
+                    break;
+                default:
+                    throw new IllegalArgumentException("Invalid size: " + size);
+            }
+        }
+    }
+
+    @Benchmark
+    public void updateEntireByteArrayChecksum(ChecksumState state, Blackhole blackhole) {
+        state.sdkChecksum.update(state.payload);
+        state.sdkChecksum.getChecksumBytes();
+        blackhole.consume(state.sdkChecksum);
+    }
+
+    @TearDown
+    public void tearDown(ChecksumState state) {
+        state.sdkChecksum.reset();
+    }
+
+    @Benchmark
+    public void updateIndividualByteChecksumOneByteATime(ChecksumState state, Blackhole blackhole) {
+        for (byte b : state.payload) {
+            state.sdkChecksum.update(b);
+        }
+        state.sdkChecksum.getChecksumBytes();
+        blackhole.consume(state.sdkChecksum);
+    }
+
+    private static String generateStringOfSize(int byteSize) {
+        String result = new String(new char[byteSize]).replace('\0', 'A'); // Approximate
+        while (result.getBytes(StandardCharsets.UTF_8).length > byteSize) {
+            result = result.substring(0, result.length() - 1); // Adjust to exact size
+        }
+        return result;
+    }
+}