feat(ws-api-watch-dir): initial commit
This commit is contained in:
parent
789eec51fd
commit
bc72cef545
|
@ -0,0 +1,31 @@
|
|||
|
||||
# Files
|
||||
.classpath
|
||||
.externalToolBuilders
|
||||
.gradle
|
||||
.project
|
||||
.pydevproject
|
||||
.settings
|
||||
.sonar
|
||||
*~
|
||||
*.ipr
|
||||
*.iml
|
||||
*.iws
|
||||
*.swp
|
||||
*.DS_Store
|
||||
*.snap.debug
|
||||
dependency-reduced-pom.xml
|
||||
|
||||
# Directories
|
||||
.idea/
|
||||
.run/
|
||||
.venv/
|
||||
_site/
|
||||
build/
|
||||
dist/
|
||||
docs/_build/
|
||||
gen-java/
|
||||
gen-javabean/
|
||||
gen-py/
|
||||
node_modules/
|
||||
target/
|
|
@ -0,0 +1,86 @@
|
|||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
|
||||
xmlns="http://maven.apache.org/POM/4.0.0"
|
||||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
|
||||
<name>watch_dir</name>
|
||||
<description>description</description>
|
||||
<url>https://swingbe.de</url>
|
||||
<groupId>de.swingbe</groupId>
|
||||
<artifactId>watch_dir</artifactId>
|
||||
<version>0.0.1</version>
|
||||
<packaging>jar</packaging>
|
||||
|
||||
<licenses>
|
||||
<license>
|
||||
<name>GNU General Public License</name>
|
||||
<url>https://www.gnu.org/licenses/gpl-3.0.txt</url>
|
||||
</license>
|
||||
</licenses>
|
||||
|
||||
<scm>
|
||||
<url>https://github.com/Software-Ingenieur-Begerad/sandbox-java</url>
|
||||
</scm>
|
||||
|
||||
<properties>
|
||||
<!-- Other properties -->
|
||||
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
|
||||
</properties>
|
||||
|
||||
<build>
|
||||
<plugins>
|
||||
<plugin>
|
||||
<groupId>org.apache.maven.plugins</groupId>
|
||||
<artifactId>maven-compiler-plugin</artifactId>
|
||||
<version>3.8.1</version>
|
||||
<configuration>
|
||||
<!-- Target Java versions -->
|
||||
<release>11</release>
|
||||
</configuration>
|
||||
</plugin>
|
||||
<plugin>
|
||||
<groupId>org.apache.maven.plugins</groupId>
|
||||
<artifactId>maven-shade-plugin</artifactId>
|
||||
<version>3.2.1</version>
|
||||
<executions>
|
||||
<execution>
|
||||
<phase>package</phase>
|
||||
<goals>
|
||||
<goal>shade</goal>
|
||||
</goals>
|
||||
<configuration>
|
||||
<filters>
|
||||
<filter>
|
||||
<!-- exclude signatures from merged JAR to avoid invalid signature messages -->
|
||||
<artifact>*:*</artifact>
|
||||
<excludes>
|
||||
<exclude>META-INF/*.SF</exclude>
|
||||
<exclude>META-INF/*.DSA</exclude>
|
||||
<exclude>META-INF/*.RSA</exclude>
|
||||
</excludes>
|
||||
</filter>
|
||||
</filters>
|
||||
<!-- The shaded JAR will not be the main artifact for the project, it will be attached
|
||||
for deployment in the way source and docs are. -->
|
||||
<shadedArtifactAttached>true
|
||||
</shadedArtifactAttached>
|
||||
<shadedClassifierName>shaded</shadedClassifierName>
|
||||
<transformers>
|
||||
<transformer
|
||||
implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
|
||||
<transformer
|
||||
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
|
||||
<manifestEntries>
|
||||
<Main-Class>de.swingbe.watch_dir.Main
|
||||
</Main-Class>
|
||||
</manifestEntries>
|
||||
</transformer>
|
||||
</transformers>
|
||||
</configuration>
|
||||
</execution>
|
||||
</executions>
|
||||
</plugin>
|
||||
</plugins>
|
||||
</build>
|
||||
</project>
|
|
@ -0,0 +1,166 @@
|
|||
package de.swingbe.watch_dir;
|
||||
|
||||
import java.io.IOException;
|
||||
import java.nio.file.*;
|
||||
import java.nio.file.attribute.BasicFileAttributes;
|
||||
import java.util.HashMap;
|
||||
import java.util.Map;
|
||||
|
||||
import static java.nio.file.LinkOption.NOFOLLOW_LINKS;
|
||||
import static java.nio.file.StandardWatchEventKinds.*;
|
||||
|
||||
/**
|
||||
* Example to watch a directory (or tree) for changes to files.
|
||||
*/
|
||||
|
||||
public class Main {
|
||||
|
||||
private final WatchService watcher;
|
||||
private final Map<WatchKey, Path> keys;
|
||||
private final boolean recursive;
|
||||
private boolean trace = false;
|
||||
|
||||
@SuppressWarnings("unchecked")
|
||||
static <T> WatchEvent<T> cast(WatchEvent<?> event) {
|
||||
return (WatchEvent<T>) event;
|
||||
}
|
||||
|
||||
/**
|
||||
* Register the given directory with the WatchService
|
||||
*/
|
||||
private void register(Path dir) throws IOException {
|
||||
WatchKey key = dir.register(watcher, ENTRY_CREATE, ENTRY_DELETE, ENTRY_MODIFY);
|
||||
if (trace) {
|
||||
Path prev = keys.get(key);
|
||||
if (prev == null) {
|
||||
System.out.format("register: %s\n", dir);
|
||||
} else {
|
||||
if (!dir.equals(prev)) {
|
||||
System.out.format("update: %s -> %s\n", prev, dir);
|
||||
}
|
||||
}
|
||||
}
|
||||
keys.put(key, dir);
|
||||
}
|
||||
|
||||
/**
|
||||
* Register the given directory, and all its sub-directories, with the
|
||||
* WatchService.
|
||||
*/
|
||||
private void registerAll(final Path start) throws IOException {
|
||||
// register directory and sub-directories
|
||||
Files.walkFileTree(start, new SimpleFileVisitor<Path>() {
|
||||
@Override
|
||||
public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs)
|
||||
throws IOException {
|
||||
register(dir);
|
||||
return FileVisitResult.CONTINUE;
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Creates a WatchService and registers the given directory
|
||||
*/
|
||||
Main(Path dir, boolean recursive) throws IOException {
|
||||
this.watcher = FileSystems.getDefault().newWatchService();
|
||||
this.keys = new HashMap<WatchKey, Path>();
|
||||
this.recursive = recursive;
|
||||
|
||||
if (recursive) {
|
||||
System.out.format("Scanning %s ...\n", dir);
|
||||
registerAll(dir);
|
||||
System.out.println("Done.");
|
||||
} else {
|
||||
register(dir);
|
||||
}
|
||||
|
||||
// enable trace after initial registration
|
||||
this.trace = true;
|
||||
}
|
||||
|
||||
/**
|
||||
* Process all events for keys queued to the watcher
|
||||
*/
|
||||
void processEvents() {
|
||||
for (; ; ) {
|
||||
|
||||
// wait for key to be signalled
|
||||
WatchKey key;
|
||||
try {
|
||||
key = watcher.take();
|
||||
} catch (InterruptedException x) {
|
||||
return;
|
||||
}
|
||||
|
||||
Path dir = keys.get(key);
|
||||
if (dir == null) {
|
||||
System.err.println("WatchKey not recognized!!");
|
||||
continue;
|
||||
}
|
||||
|
||||
for (WatchEvent<?> event : key.pollEvents()) {
|
||||
WatchEvent.Kind kind = event.kind();
|
||||
|
||||
// TBD - provide example of how OVERFLOW event is handled
|
||||
if (kind == OVERFLOW) {
|
||||
continue;
|
||||
}
|
||||
|
||||
// Context for directory entry event is the file name of entry
|
||||
WatchEvent<Path> ev = cast(event);
|
||||
Path name = ev.context();
|
||||
Path child = dir.resolve(name);
|
||||
|
||||
// print out event
|
||||
System.out.format("%s: %s\n", event.kind().name(), child);
|
||||
|
||||
// if directory is created, and watching recursively, then
|
||||
// register it and its sub-directories
|
||||
if (recursive && (kind == ENTRY_CREATE)) {
|
||||
try {
|
||||
if (Files.isDirectory(child, NOFOLLOW_LINKS)) {
|
||||
registerAll(child);
|
||||
}
|
||||
} catch (IOException x) {
|
||||
// ignore to keep sample readbale
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// reset key and remove from set if directory no longer accessible
|
||||
boolean valid = key.reset();
|
||||
if (!valid) {
|
||||
keys.remove(key);
|
||||
|
||||
// all directories are inaccessible
|
||||
if (keys.isEmpty()) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void usage() {
|
||||
System.err.println("usage: java Main [-r] dir");
|
||||
System.exit(-1);
|
||||
}
|
||||
|
||||
public static void main(String[] args) throws IOException {
|
||||
// parse arguments
|
||||
if (args.length == 0 || args.length > 2)
|
||||
usage();
|
||||
boolean recursive = false;
|
||||
int dirArg = 0;
|
||||
if (args[0].equals("-r")) {
|
||||
if (args.length < 2)
|
||||
usage();
|
||||
recursive = true;
|
||||
dirArg++;
|
||||
}
|
||||
|
||||
// register directory and process its events
|
||||
Path dir = Paths.get(args[dirArg]);
|
||||
new Main(dir, recursive).processEvents();
|
||||
}
|
||||
}
|
Loading…
Reference in New Issue