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File watching utility

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Rsl1122 2018-12-10 19:50:18 +02:00
parent 858f197e58
commit e3b0d8efa8
3 changed files with 181 additions and 0 deletions
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109
Plan/common/src/main/java/com/djrapitops/plan/utilities/file/FileWatcher.java Normal file
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/*
* This file is part of Player Analytics (Plan).
*
* Plan is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License v3 as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Plan is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Plan. If not, see <https://www.gnu.org/licenses/>.
*/
package com.djrapitops.plan.utilities.file;
import com.djrapitops.plugin.logging.L;
import com.djrapitops.plugin.logging.error.ErrorHandler;
import com.djrapitops.plugin.utilities.Verify;
import java.io.File;
import java.io.IOException;
import java.nio.file.*;
import java.util.ArrayList;
import java.util.List;
import static java.nio.file.StandardWatchEventKinds.ENTRY_MODIFY;
/**
* Class for watching files for changes.
*
* @author Rsl1122
*/
public class FileWatcher extends Thread {
private final ErrorHandler errorHandler;
private volatile boolean running;
private Path watchedPath;
private List<WatchedFile> watchedFiles;
public FileWatcher(File folder, ErrorHandler errorHandler) {
this(folder, errorHandler, new ArrayList<>());
}
public FileWatcher(
File folder,
ErrorHandler errorHandler,
List<WatchedFile> watchedFiles
) {
this.errorHandler = errorHandler;
this.running = false;
this.watchedFiles = watchedFiles;
Verify.isTrue(Files.isDirectory(folder.toPath()), () -> new IllegalArgumentException("Given File " + folder.getAbsolutePath() + " was not a folder."));
watchedPath = folder.toPath();
}
public void addToWatchlist(WatchedFile watchedFile) {
watchedFiles.add(watchedFile);
}
@Override
public void run() {
this.running = true;
try (WatchService watcher = FileSystems.getDefault().newWatchService()) {
watchedPath.register(watcher, ENTRY_MODIFY);
while (running) {
WatchKey key = watcher.take();
if (key == null) {
Thread.yield();
continue;
}
for (WatchEvent<?> event : key.pollEvents()) {
if (event.kind() != ENTRY_MODIFY) {
Thread.yield();
} else {
@SuppressWarnings("unchecked")
Path modifiedFile = ((WatchEvent<Path>) event).context();
for (WatchedFile watchedFile : watchedFiles) {
watchedFile.modified(modifiedFile);
}
}
if (!key.reset()) {
break;
}
}
}
} catch (IOException e) {
errorHandler.log(L.ERROR, this.getClass(), e);
} catch (InterruptedException e) {
interrupt();
}
}
@Override
public void interrupt() {
running = false;
super.interrupt();
}
}

44
Plan/common/src/main/java/com/djrapitops/plan/utilities/file/WatchedFile.java Normal file
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/*
* This file is part of Player Analytics (Plan).
*
* Plan is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License v3 as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Plan is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Plan. If not, see <https://www.gnu.org/licenses/>.
*/
package com.djrapitops.plan.utilities.file;
import com.djrapitops.plan.utilities.java.VoidFunction;
import java.io.File;
import java.nio.file.Path;
/**
* File with a consumer that is called if the file is modified.
*
* @author Rsl1122
*/
public class WatchedFile {
private final File file;
private final VoidFunction onChange;
public WatchedFile(File file, VoidFunction onChange) {
this.file = file;
this.onChange = onChange;
}
public void modified(Path modifiedPath) {
if (modifiedPath != null && file.toPath().equals(modifiedPath)) {
onChange.apply();
}
}
}

28
Plan/common/src/main/java/com/djrapitops/plan/utilities/java/VoidFunction.java Normal file
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/*
* This file is part of Player Analytics (Plan).
*
* Plan is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License v3 as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Plan is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Plan. If not, see <https://www.gnu.org/licenses/>.
*/
package com.djrapitops.plan.utilities.java;
/**
* Functional interface that performs an operation that returns nothing.
* <p>
* Follows naming scheme of Java 8 functional interfaces.
*
* @author Rsl1122
*/
public interface VoidFunction {
void apply();
}