com.facebook.presto.util.Threads.java Source code

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Here is the source code for com.facebook.presto.util.Threads.java

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/*
 * 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.facebook.presto.util;

import com.google.common.base.Throwables;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.common.util.concurrent.SettableFuture;

import java.util.concurrent.Executor;
import java.util.concurrent.TimeUnit;

import static com.google.common.base.Preconditions.checkArgument;
import static java.lang.String.format;
import static java.util.Objects.requireNonNull;

public final class Threads {
    private static final Class<? extends ListeningExecutorService> GUAVA_SAME_THREAD_EXECUTOR_CLASS = MoreExecutors
            .sameThreadExecutor().getClass();

    private Threads() {
    }

    public static Executor checkNotSameThreadExecutor(Executor executor, String name) {
        if (executor == null) {
            throw new NullPointerException(format("%s is null", name));
        }
        checkArgument(!isSameThreadExecutor(executor), "%s is a same thread executor", name);
        return executor;
    }

    public static boolean isSameThreadExecutor(Executor executor) {
        requireNonNull(executor, "executor is null");
        if (executor.getClass() == GUAVA_SAME_THREAD_EXECUTOR_CLASS) {
            return true;
        }

        final Thread thisThread = Thread.currentThread();
        final SettableFuture<Boolean> isSameThreadExecutor = SettableFuture.create();
        executor.execute(new Runnable() {
            @Override
            public void run() {
                isSameThreadExecutor.set(thisThread == Thread.currentThread());
            }
        });
        try {
            return Futures.get(isSameThreadExecutor, 10, TimeUnit.SECONDS, Exception.class);
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
            throw Throwables.propagate(e);
        } catch (Exception e) {
            throw Throwables.propagate(e);
        }
    }
}