Create codeguru.java

src/codeguru.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2015 M. Isuru Tharanga Chrishantha Perera
+ *
+ * Licensed 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 com.github.chrishantha.sample.highcpu;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.UUID;
+
+public class HashingWorker implements Runnable {
+
+    private final String algorithm;
+    private final long length;
+
+    private byte[] lastComputedHash;
+
+    public HashingWorker(long length, String algorithm) {
+        this.length = length;
+        this.algorithm = algorithm;
+    }
+
+    @SuppressWarnings("InfiniteLoopStatement")
+    @Override
+    public void run() {
+        while (true) {
+            StringBuilder data = new StringBuilder();
+
+            // Some random data
+            for (int i = 0; i < length; i++) {
+                data.append(UUID.randomUUID().toString());
+            }
+
+            MessageDigest digest;
+            try {
+                digest = MessageDigest.getInstance(algorithm);
+            } catch (NoSuchAlgorithmException e) {
+                throw new RuntimeException(e);
+            }
+
+            // Hash
+            digest.update(data.toString().getBytes());
+            byte[] computedHash = digest.digest();
+            if (lastComputedHash != null && computedHash.length != lastComputedHash.length) {
+                throw new IllegalStateException("Is the hash computation correct??");
+            }
+            lastComputedHash = computedHash;
+        }
+    }
+}