add test

circe-checksum/src/test/java/com/scurrilous/circe/checksum/Java9IntHashTest.java

@@ -0,0 +1,113 @@
+package com.scurrilous.circe.checksum;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufAllocator;
+import io.netty.buffer.CompositeByteBuf;
+import io.netty.buffer.DuplicatedByteBuf;
+import java.util.Random;
+import lombok.extern.slf4j.Slf4j;
+import org.junit.Assert;
+import org.junit.Test;
+
+@Slf4j
+public class Java9IntHashTest {
+
+    @Test
+    public void calculateCheckSum() {
+        Random random = new Random();
+        int hugeDataLen = 4096 * 3;
+        byte[] hugeData = new byte[hugeDataLen];
+        for (int i = 0; i < hugeDataLen; i ++) {
+            hugeData[i] = (byte) (random.nextInt() % 127);
+        }
+
+        // b_total = b1 + b2 + b3;
+        ByteBuf bTotal = ByteBufAllocator.DEFAULT.heapBuffer(6 + hugeDataLen);
+        bTotal.writeBytes(new byte[]{1,2,3,4,5,6});
+        bTotal.writeBytes(hugeData);
+        ByteBuf b1 = ByteBufAllocator.DEFAULT.heapBuffer(3);
+        b1.writeBytes(new byte[]{1,2,3});
+        ByteBuf b2 = ByteBufAllocator.DEFAULT.heapBuffer(3);
+        b2.writeBytes(new byte[]{4,5,6});
+        ByteBuf b3 = ByteBufAllocator.DEFAULT.heapBuffer(hugeDataLen);
+        b2.writeBytes(hugeData);
+
+        // Calculate: case-1.
+        int checksumRes1 = Crc32cIntChecksum.computeChecksum(bTotal);
+        log.info("checksumRes1: {}", checksumRes1);
+
+        // Calculate: case-2.
+        int b1CheckSum = Crc32cIntChecksum.computeChecksum(b1);
+        log.info("b1CheckSum: {}", b1CheckSum);
+        int checksumRes2 = Crc32cIntChecksum.resumeChecksum(b1CheckSum,
+                new CompositeByteBuf(ByteBufAllocator.DEFAULT, false, 2,  b2, b3));
+        log.info("checksumRes2: {}", checksumRes2);
+
+        // Verify: the results of both ways to calculate the checksum are same.
+        Assert.assertEquals(checksumRes1, checksumRes2);
+
+        // cleanup.
+        bTotal.release();
+        b1.release();
+        b2.release();
+        b3.release();
+    }
+
+    @Test
+    public void calculateCheckSum2() {
+        Random random = new Random();
+        int hugeDataLen = 4096 * 3;
+        byte[] hugeData = new byte[hugeDataLen];
+        for (int i = 0; i < hugeDataLen; i ++) {
+            hugeData[i] = (byte) (random.nextInt() % 127);
+        }
+
+        // b_total = b1 + b2 + b3;
+        ByteBuf bTotal = ByteBufAllocator.DEFAULT.heapBuffer(6 + hugeDataLen);
+        bTotal.writeBytes(new byte[]{1,2,3,4,5,6});
+        bTotal.writeBytes(hugeData);
+        ByteBuf b1 = ByteBufAllocator.DEFAULT.heapBuffer(3);
+        b1.writeBytes(new byte[]{1,2,3});
+        ByteBuf b2 = ByteBufAllocator.DEFAULT.heapBuffer(3);
+        b2.writeBytes(new byte[]{4,5,6});
+        ByteBuf b3 = ByteBufAllocator.DEFAULT.heapBuffer(hugeDataLen);
+        b2.writeBytes(hugeData);
+
+        // Calculate: case-1.
+        int checksumRes1 = Crc32cIntChecksum.computeChecksum(bTotal);
+        log.info("checksumRes1: {}", checksumRes1);
+
+        // Calculate: case-2.
+        int b1CheckSum = Crc32cIntChecksum.computeChecksum(b1);
+        log.info("b1CheckSum: {}", b1CheckSum);
+        int checksumRes2 = Crc32cIntChecksum.resumeChecksum(b1CheckSum,
+                new NoArrayNoMemoryAddrByteBuff(new CompositeByteBuf(ByteBufAllocator.DEFAULT, false, 2,  b2, b3)));
+        log.info("checksumRes2: {}", checksumRes2);
+
+        // Verify: the results of both ways to calculate the checksum are same.
+        Assert.assertEquals(checksumRes1, checksumRes2);
+
+        // cleanup.
+        bTotal.release();
+        b1.release();
+        b2.release();
+        b3.release();
+    }
+
+    public static class NoArrayNoMemoryAddrByteBuff extends DuplicatedByteBuf {
+
+        public NoArrayNoMemoryAddrByteBuff(ByteBuf buffer) {
+            super(buffer);
+        }
+
+        @Override
+        public boolean hasArray(){
+            return false;
+        }
+
+        @Override
+        public boolean hasMemoryAddress(){
+            return false;
+        }
+    }
+}