// Copyright 2015 The Bazel Authors. 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.
package com.google.testing.junit.runner.testbed;
import com.google.common.io.ByteStreams;
import com.google.common.io.Files;
import java.io.File;
import java.io.IOException;
/**
* Utility class to synchronize test bed tests and shell tests using a FIFO file.
*/
public final class Fifo {
private static final String FIFO = System.getProperty("test.fifo");
private Fifo(){}
/**
* Helper method to help with the synchronization between testbed java test and shell tests. It
* will block until data is available on the FIFO
*/
static void waitUntilDataAvailable() throws IOException {
if (FIFO == null) {
throw new IllegalStateException("No fifo specified");
}
Files.asByteSource(new File(FIFO)).copyTo(ByteStreams.nullOutputStream());
}
}