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/*
 * Copyright 2015 The gRPC Authors
 *
 * 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 io.grpc.internal;

import com.google.common.base.Preconditions;
import java.util.ArrayDeque;
import java.util.concurrent.Executor;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Executes a task directly in the calling thread, unless it's a reentrant call in which case the
 * task is enqueued and executed once the calling task completes.
 *
 * 

The {@code Executor} assumes that reentrant calls are rare and its fast path is thus * optimized for that - avoiding queuing and additional object creation altogether. * *

This class is not thread-safe. */ class SerializeReentrantCallsDirectExecutor implements Executor { private static final Logger log = Logger.getLogger(SerializeReentrantCallsDirectExecutor.class.getName()); private boolean executing; // Lazily initialized if a reentrant call is detected. private ArrayDeque taskQueue; @Override public void execute(Runnable task) { Preconditions.checkNotNull(task, "'task' must not be null."); if (!executing) { executing = true; try { task.run(); } catch (Throwable t) { log.log(Level.SEVERE, "Exception while executing runnable " + task, t); } finally { if (taskQueue != null) { completeQueuedTasks(); } executing = false; } } else { enqueue(task); } } private void completeQueuedTasks() { Runnable task = null; while ((task = taskQueue.poll()) != null) { try { task.run(); } catch (Throwable t) { // Log it and keep going log.log(Level.SEVERE, "Exception while executing runnable " + task, t); } } } private void enqueue(Runnable r) { if (taskQueue == null) { taskQueue = new ArrayDeque<>(4); } taskQueue.add(r); } }





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