com.twosigma.webtau.cli.interactive.BackgroundFileWatcher.groovy Maven / Gradle / Ivy

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/*
 * Copyright 2019 TWO SIGMA OPEN SOURCE, LLC
 *
 * 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.twosigma.webtau.cli.interactive

import java.nio.file.Path

class BackgroundFileWatcher {
    private Path root
    private FileWatcher fileWatcher
    private Thread thread
    private final OnFileChangeHandler onFileChangeHandler

    BackgroundFileWatcher(Path root, OnFileChangeHandler onFileChangeHandler) {
        this.root = root.toAbsolutePath()
        this.onFileChangeHandler = onFileChangeHandler
    }

    void startIfRequired() {
        if (thread) {
            return
        }

        fileWatcher = new FileWatcher(root, onFileChangeHandler)
        thread = Thread.start { -> fileWatcher.start() }
    }

    void stop() {
        if (fileWatcher) {
            fileWatcher.stop()
        }
    }
}