| /* |
| * 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 |
| * |
| * 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 org.apache.cassandra.concurrent; |
| |
| import org.apache.cassandra.utils.Closeable; |
| import org.apache.cassandra.utils.Shared; |
| import org.apache.cassandra.utils.WithResources; |
| import org.apache.cassandra.utils.concurrent.Future; |
| import org.apache.cassandra.utils.concurrent.ImmediateFuture; |
| |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.TimeUnit; |
| |
| import static org.apache.cassandra.utils.Shared.Scope.SIMULATION; |
| |
| @Shared(scope = SIMULATION) // shared to support instanceof check in SimulatedAction |
| public class ImmediateExecutor implements LocalAwareExecutorPlus |
| { |
| public static final ImmediateExecutor INSTANCE = new ImmediateExecutor(); |
| |
| private ImmediateExecutor() {} |
| |
| public <T> Future<T> submit(Callable<T> task) |
| { |
| try |
| { |
| return ImmediateFuture.success(task.call()); |
| } |
| catch (Throwable t) |
| { |
| ExecutionFailure.handle(t); |
| return ImmediateFuture.failure(t); |
| } |
| } |
| |
| public <T> Future<T> submit(Runnable task, T result) |
| { |
| try |
| { |
| task.run(); |
| return ImmediateFuture.success(result); |
| } |
| catch (Throwable t) |
| { |
| ExecutionFailure.handle(t); |
| return ImmediateFuture.failure(t); |
| } |
| } |
| |
| public Future<?> submit(Runnable task) |
| { |
| try |
| { |
| task.run(); |
| return ImmediateFuture.success(null); |
| } |
| catch (Throwable t) |
| { |
| ExecutionFailure.handle(t); |
| return ImmediateFuture.failure(t); |
| } |
| } |
| |
| @Override |
| public void execute(WithResources withResources, Runnable task) |
| { |
| try (Closeable ignored = withResources.get()) |
| { |
| task.run(); |
| } |
| catch (Throwable t) |
| { |
| ExecutionFailure.handle(t); |
| } |
| } |
| |
| @Override |
| public <T> Future<T> submit(WithResources withResources, Callable<T> task) |
| { |
| try (Closeable ignored = withResources.get()) |
| { |
| return ImmediateFuture.success(task.call()); |
| } |
| catch (Throwable t) |
| { |
| ExecutionFailure.handle(t); |
| return ImmediateFuture.failure(t); |
| } |
| } |
| |
| @Override |
| public Future<?> submit(WithResources withResources, Runnable task) |
| { |
| return submit(withResources, task, null); |
| } |
| |
| @Override |
| public <T> Future<T> submit(WithResources withResources, Runnable task, T result) |
| { |
| try (Closeable ignored = withResources.get()) |
| { |
| task.run(); |
| return ImmediateFuture.success(result); |
| } |
| catch (Throwable t) |
| { |
| ExecutionFailure.handle(t); |
| return ImmediateFuture.failure(t); |
| } |
| } |
| |
| @Override |
| public boolean inExecutor() |
| { |
| return true; |
| } |
| |
| public void execute(Runnable task) |
| { |
| try |
| { |
| task.run(); |
| } |
| catch (Throwable t) |
| { |
| ExecutionFailure.handle(t); |
| } |
| } |
| |
| public int getActiveTaskCount() { return 0; } |
| public long getCompletedTaskCount() { return 0; } |
| public int getPendingTaskCount() { return 0; } |
| public int getCorePoolSize() { return 0; } |
| public int getMaximumPoolSize() { return 0; } |
| public void setCorePoolSize(int newCorePoolSize) { throw new IllegalArgumentException("Cannot resize ImmediateExecutor"); } |
| public void setMaximumPoolSize(int newMaximumPoolSize) { throw new IllegalArgumentException("Cannot resize ImmediateExecutor"); } |
| |
| public void shutdown() { } |
| public List<Runnable> shutdownNow() { return Collections.emptyList(); } |
| public boolean isShutdown() { return false; } |
| public boolean isTerminated() { return false; } |
| public boolean awaitTermination(long timeout, TimeUnit unit) { return true; } |
| } |