br.com.objectos.io.WatchServiceJava6 Maven / Gradle / Ivy

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/*
 * Copyright (C) 2011-2021 Objectos Software LTDA.
 *
 * 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 br.com.objectos.io;

import static br.com.objectos.collections.Collections.newGrowableMap;
import static br.com.objectos.collections.Collections.toImmutableSet;
import static br.com.objectos.lang.Lang.checkNotNull;

import br.com.objectos.collections.ImmutableSet;
import java.util.Collection;
import java.util.EnumSet;
import java.util.Map;

final class WatchServiceJava6 extends Thread implements WatchService {

  private final ImmutableSet directories;

  private final int timeout = 1 * 1000;

  WatchServiceJava6(ImmutableSet directories) {
    super("WatchService");

    this.directories = directories;
  }

  @Override
  public final void onShutdownHook() {
    stopService();
  }

  @Override
  public final void run() {
    while (!Thread.interrupted()) {
      try {
        Thread.sleep(timeout);

        for (WatchDirectoryJava6 dir : directories) {
          dir.checkForEvents();
        }
      } catch (InterruptedException e) {
        return;
      }
    }
  }

  @Override
  public final void startService() {
    start();
  }

  @Override
  public final void stopService() {
    interrupt();
  }

  static final class Builder implements WatchServiceBuilder {

    private final Map directories = newGrowableMap();

    public final WatchService build() {
      Collection values;
      values = directories.values();

      ImmutableSet set;
      set = toImmutableSet(values);

      return new WatchServiceJava6(set);
    }

    @Override
    public final void watchDirectory(
        Directory directory, WatchServiceListener listener, EventKind event) {
      checkNotNull(directory, "directory == null");

      if (directories.containsKey(directory)) {
        throw new IllegalArgumentException(directory.getPath() + " has already been registered");
      }

      checkNotNull(listener, "listener == null");
      checkNotNull(event, "event == null");

      EnumSet events;
      events = EnumSet.of(event);

      WatchDirectoryJava6 option;
      option = new WatchDirectoryJava6(directory, listener, events);

      option.register();

      directories.put(directory, option);
    }

  }

}