1 files changed, 186 insertions, 0 deletions
diff --git a/utils-test/src/main/java/org/onap/policy/common/utils/time/PseudoScheduledExecutorService.java b/utils-test/src/main/java/org/onap/policy/common/utils/time/PseudoScheduledExecutorService.java
new file mode 100644
index 00000000..4f9b32c9
--- /dev/null
+++ b/utils-test/src/main/java/org/onap/policy/common/utils/time/PseudoScheduledExecutorService.java
@@ -0,0 +1,186 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. 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.
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.utils.time;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+import java.util.concurrent.FutureTask;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ScheduledFuture;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+import java.util.stream.Collectors;
+
+/**
+ * Scheduled executor service that uses {@link TestTimeMulti} to execute its tasks. Note:
+ * the invokeXxx() methods are not currently supported.
+ */
+public class PseudoScheduledExecutorService implements ScheduledExecutorService {
+    private static final String NOT_IMPLEMENTED_YET = "not implemented yet";
+
+    /**
+     * Object to be used to execute timer tasks.
+     */
+    private final TestTimeMulti currentTime;
+
+    /**
+     * {@code True} if {@link #shutdown()} or {@link #shutdownNow()} has been called,
+     * {@code false} otherwise.
+     */
+    private boolean shutdown = false;
+
+    /**
+     * Constructs the object.
+     *
+     * @param currentTime object to be used to execute timer tasks
+     */
+    public PseudoScheduledExecutorService(TestTimeMulti currentTime) {
+        this.currentTime = currentTime;
+    }
+
+    /**
+     * Cancels <i>all</i> tasks that have not yet been executed.
+     */
+    @Override
+    public void shutdown() {
+        shutdown = true;
+        currentTime.cancelItems(this);
+    }
+
+    /**
+     * Cancels <i>all</i> tasks that have not yet been executed. Does <i>not</i> interrupt
+     * any currently executing task.
+     */
+    @Override
+    public List<Runnable> shutdownNow() {
+        shutdown = true;
+        return currentTime.cancelItems(this).stream().map(item -> ((RunnableItem) item).getAction())
+                        .collect(Collectors.toList());
+    }
+
+    @Override
+    public boolean isShutdown() {
+        return shutdown;
+    }
+
+    @Override
+    public boolean isTerminated() {
+        return shutdown;
+    }
+
+    @Override
+    public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException {
+        return shutdown;
+    }
+
+    @Override
+    public <T> Future<T> submit(Callable<T> task) {
+        return enqueueRunOnce(0, new FutureTask<>(task));
+    }
+
+    @Override
+    public <T> Future<T> submit(Runnable task, T result) {
+        return enqueueRunOnce(0, new FutureTask<>(task, result));
+    }
+
+    @Override
+    public Future<?> submit(Runnable task) {
+        return enqueueRunOnce(0, new FutureTask<>(task, null));
+    }
+
+    @Override
+    public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks) throws InterruptedException {
+        throw new UnsupportedOperationException(NOT_IMPLEMENTED_YET);
+    }
+
+    @Override
+    public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit)
+                    throws InterruptedException {
+        throw new UnsupportedOperationException(NOT_IMPLEMENTED_YET);
+    }
+
+    @Override
+    public <T> T invokeAny(Collection<? extends Callable<T>> tasks) throws InterruptedException, ExecutionException {
+        throw new UnsupportedOperationException(NOT_IMPLEMENTED_YET);
+    }
+
+    @Override
+    public <T> T invokeAny(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit)
+                    throws InterruptedException, ExecutionException, TimeoutException {
+        throw new UnsupportedOperationException(NOT_IMPLEMENTED_YET);
+    }
+
+    @Override
+    public void execute(Runnable command) {
+        currentTime.enqueue(new RunnableItem(currentTime, this, 0, command));
+    }
+
+    @Override
+    public ScheduledFuture<?> schedule(Runnable command, long delay, TimeUnit unit) {
+        return enqueueRunOnce(unit.toMillis(delay), new PseudoScheduledFuture<>(command, null, false));
+    }
+
+    @Override
+    public <V> ScheduledFuture<V> schedule(Callable<V> callable, long delay, TimeUnit unit) {
+        return enqueueRunOnce(unit.toMillis(delay), new PseudoScheduledFuture<>(callable, false));
+    }
+
+    @Override
+    public ScheduledFuture<?> scheduleAtFixedRate(Runnable command, long initialDelay, long period, TimeUnit unit) {
+        return enqueuePeriodic(unit.toMillis(initialDelay), unit.toMillis(period),
+                        new PseudoScheduledFuture<>(command, null, true));
+    }
+
+    @Override
+    public ScheduledFuture<?> scheduleWithFixedDelay(Runnable command, long initialDelay, long delay, TimeUnit unit) {
+        return enqueuePeriodic(unit.toMillis(initialDelay), unit.toMillis(delay),
+                        new PseudoScheduledFuture<>(command, null, true));
+    }
+
+    /**
+     * Enqueues a future to be executed one time.
+     *
+     * @param delay delay until the future should be executed
+     * @param future future to be enqueued
+     * @return the future
+     */
+    private <F extends FutureTask<T>, T> F enqueueRunOnce(long delay, F future) {
+        currentTime.enqueue(new RunnableItem(currentTime, this, delay, future));
+        return future;
+    }
+
+    /**
+     * Enqueues a future to be executed periodically.
+     *
+     * @param initialDelayMs delay until the future should be executed the first time
+     * @param periodMs delay between executions of the future
+     * @param future future to be enqueued
+     * @return the future
+     */
+    private <T> ScheduledFuture<T> enqueuePeriodic(long initialDelayMs, long periodMs,
+                    PseudoScheduledFuture<T> future) {
+        currentTime.enqueue(new PeriodicItem(currentTime, this, initialDelayMs, periodMs, future));
+        return future;
+    }
+}