Support utils.Time of kafka-client-spout (apache#3116)

* Support utils.Time of kafka-client-spout

Author: thinker0

storm-compatibility/src/java/org/apache/storm/utils/Time.java

@@ -0,0 +1,241 @@
+/**
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.storm.utils;
+
+import java.util.Iterator;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.concurrent.locks.LockSupport;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * This class implements time simulation support. When time simulation is enabled,
+ * methods on this class will use fixed time. When time simulation is disabled,
+ * methods will pass through to relevant java.lang.System/java.lang.Thread calls.
+ * Methods using units higher than nanoseconds will pass through to System.currentTimeMillis().
+ * Methods supporting nanoseconds will pass through to System.nanoTime().
+ */
+public final class Time {
+  private static final Logger LOG = Logger.getLogger(Time.class.getName());
+  private static final AtomicBoolean SIMULATING = new AtomicBoolean(false);
+  private static final AtomicLong AUTO_ADVANCE_NANOS_ON_SLEEP = new AtomicLong(0);
+  private static final Map<Thread, AtomicLong> THREAD_SLEEP_TIMES_NANOS = new ConcurrentHashMap<>();
+  private static final Object SLEEP_TIMES_LOCK = new Object();
+  private static final AtomicLong SIMULATED_CURR_TIME_NANOS = new AtomicLong(0);
+
+  private Time() {
+  }
+
+  public static boolean isSimulating() {
+    return SIMULATING.get();
+  }
+
+  public static void sleepUntil(long targetTimeMs) throws InterruptedException {
+    if (SIMULATING.get()) {
+      simulatedSleepUntilNanos(millisToNanos(targetTimeMs));
+    } else {
+      long sleepTimeMs = targetTimeMs - currentTimeMillis();
+      if (sleepTimeMs > 0) {
+        Thread.sleep(sleepTimeMs);
+      }
+    }
+  }
+
+  public static void sleepUntilNanos(long targetTimeNanos) throws InterruptedException {
+    if (SIMULATING.get()) {
+      simulatedSleepUntilNanos(targetTimeNanos);
+    } else {
+      long sleepTimeNanos = targetTimeNanos - nanoTime();
+      long sleepTimeMs = nanosToMillis(sleepTimeNanos);
+      int sleepTimeNanosSansMs = (int) (sleepTimeNanos % 1_000_000);
+      if (sleepTimeNanos > 0) {
+        Thread.sleep(sleepTimeMs, sleepTimeNanosSansMs);
+      }
+    }
+  }
+
+  private static void simulatedSleepUntilNanos(long targetTimeNanos) throws InterruptedException {
+    try {
+      synchronized (SLEEP_TIMES_LOCK) {
+        if (!SIMULATING.get()) {
+          LOG.log(Level.FINER, Thread.currentThread()
+                  + " is still sleeping after simulated time disabled.",
+              new RuntimeException("STACK TRACE"));
+          throw new InterruptedException();
+        }
+        THREAD_SLEEP_TIMES_NANOS.put(Thread.currentThread(), new AtomicLong(targetTimeNanos));
+      }
+      while (SIMULATED_CURR_TIME_NANOS.get() < targetTimeNanos) {
+        synchronized (SLEEP_TIMES_LOCK) {
+          if (!SIMULATING.get()) {
+            LOG.log(Level.FINER, Thread.currentThread()
+                    + " is still sleeping after simulated time disabled.",
+                new RuntimeException("STACK TRACE"));
+            throw new InterruptedException();
+          }
+          long autoAdvance = AUTO_ADVANCE_NANOS_ON_SLEEP.get();
+          if (autoAdvance > 0) {
+            advanceTimeNanos(autoAdvance);
+          }
+        }
+        Thread.sleep(10);
+      }
+    } finally {
+      THREAD_SLEEP_TIMES_NANOS.remove(Thread.currentThread());
+    }
+  }
+
+  public static void sleep(long ms) throws InterruptedException {
+    if (ms > 0) {
+      if (SIMULATING.get()) {
+        simulatedSleepUntilNanos(millisToNanos(currentTimeMillis() + ms));
+      } else {
+        Thread.sleep(ms);
+      }
+    }
+  }
+
+  public static void parkNanos(long nanos) throws InterruptedException {
+    if (nanos > 0) {
+      if (SIMULATING.get()) {
+        simulatedSleepUntilNanos(nanoTime() + nanos);
+      } else {
+        LockSupport.parkNanos(nanos);
+      }
+    }
+  }
+
+  public static void sleepSecs(long secs) throws InterruptedException {
+    if (secs > 0) {
+      sleep(secs * 1000);
+    }
+  }
+
+  public static long nanoTime() {
+    if (SIMULATING.get()) {
+      return SIMULATED_CURR_TIME_NANOS.get();
+    } else {
+      return System.nanoTime();
+    }
+  }
+
+  public static long currentTimeMillis() {
+    if (SIMULATING.get()) {
+      return nanosToMillis(SIMULATED_CURR_TIME_NANOS.get());
+    } else {
+      return System.currentTimeMillis();
+    }
+  }
+
+  public static long nanosToMillis(long nanos) {
+    return nanos / 1_000_000;
+  }
+
+  public static long millisToNanos(long millis) {
+    return millis * 1_000_000;
+  }
+
+  public static long secsToMillis(int secs) {
+    return 1000 * (long) secs;
+  }
+
+  public static long secsToMillisLong(double secs) {
+    return (long) (1000 * secs);
+  }
+
+  public static int currentTimeSecs() {
+    return (int) (currentTimeMillis() / 1000);
+  }
+
+  public static int deltaSecs(int timeInSeconds) {
+    return Time.currentTimeSecs() - timeInSeconds;
+  }
+
+  public static long deltaMs(long timeInMilliseconds) {
+    return Time.currentTimeMillis() - timeInMilliseconds;
+  }
+
+  public static void advanceTime(long ms) {
+    advanceTimeNanos(millisToNanos(ms));
+  }
+
+  public static void advanceTimeNanos(long nanos) {
+    if (!SIMULATING.get()) {
+      throw new IllegalStateException("Cannot simulate time unless in simulation mode");
+    }
+    if (nanos < 0) {
+      throw new IllegalArgumentException("advanceTime only accepts positive time as an argument");
+    }
+    synchronized (SLEEP_TIMES_LOCK) {
+      long newTime = SIMULATED_CURR_TIME_NANOS.addAndGet(nanos);
+      Iterator<AtomicLong> sleepTimesIter = THREAD_SLEEP_TIMES_NANOS.values().iterator();
+      while (sleepTimesIter.hasNext()) {
+        AtomicLong curr = sleepTimesIter.next();
+        if (SIMULATED_CURR_TIME_NANOS.get() >= curr.get()) {
+          sleepTimesIter.remove();
+        }
+      }
+      LOG.log(Level.FINER, "Advanced simulated time to " + newTime);
+    }
+  }
+
+  public static void advanceTimeSecs(long secs) {
+    advanceTime(secs * 1_000);
+  }
+
+  public static boolean isThreadWaiting(Thread t) {
+    if (!SIMULATING.get()) {
+      throw new IllegalStateException("Must be in simulation mode");
+    }
+    AtomicLong time = THREAD_SLEEP_TIMES_NANOS.get(t);
+    return !t.isAlive() || time != null && nanoTime() < time.longValue();
+  }
+
+  public static class SimulatedTime implements AutoCloseable {
+
+    public SimulatedTime() {
+      this(null);
+    }
+
+    public SimulatedTime(Number advanceTimeMs) {
+      synchronized (Time.SLEEP_TIMES_LOCK) {
+        Time.SIMULATING.set(true);
+        Time.SIMULATED_CURR_TIME_NANOS.set(0);
+        Time.THREAD_SLEEP_TIMES_NANOS.clear();
+        if (advanceTimeMs != null) {
+          Time.AUTO_ADVANCE_NANOS_ON_SLEEP.set(millisToNanos(advanceTimeMs.longValue()));
+        } else {
+          Time.AUTO_ADVANCE_NANOS_ON_SLEEP.set(0);
+        }
+        LOG.warning("AutoCloseable Simulated Time Starting...");
+      }
+    }
+
+    @Override
+    public void close() {
+      synchronized (Time.SLEEP_TIMES_LOCK) {
+        Time.SIMULATING.set(false);
+        LOG.warning("AutoCloseable Simulated Time Ending...");
+      }
+    }
+  }
+}