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FileObserver: start monitoring new directories when they are created

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This commit is contained in:
Daniel Gultsch 2020-07-30 12:55:19 +02:00
parent e10b182d6b
commit f5f9075da2
2 changed files with 45 additions and 31 deletions
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13
src/main/java/eu/siacs/conversations/services/XmppConnectionService.java
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@ -239,8 +239,8 @@ public class XmppConnectionService extends Service {
Environment.getExternalStorageDirectory().getAbsolutePath() Environment.getExternalStorageDirectory().getAbsolutePath()
) { ) {
@Override @Override
public void onEvent(int event, String path) { public void onEvent(final int event, final File file) {
markFileDeleted(path); markFileDeleted(file);
} }
}; };
private final OnMessageAcknowledged mOnMessageAcknowledgedListener = new OnMessageAcknowledged() { private final OnMessageAcknowledged mOnMessageAcknowledgedListener = new OnMessageAcknowledged() {
@ -1859,17 +1859,16 @@ public class XmppConnectionService extends Service {
return this.conversations; return this.conversations;
} }
private void markFileDeleted(final String path) { private void markFileDeleted(final File file) {
synchronized (FILENAMES_TO_IGNORE_DELETION) { synchronized (FILENAMES_TO_IGNORE_DELETION) {
if (FILENAMES_TO_IGNORE_DELETION.remove(path)) { if (FILENAMES_TO_IGNORE_DELETION.remove(file.getAbsolutePath())) {
Log.d(Config.LOGTAG, "ignored deletion of " + path); Log.d(Config.LOGTAG, "ignored deletion of " + file.getAbsolutePath());
return; return;
} }
} }
final File file = new File(path);
final boolean isInternalFile = fileBackend.isInternalFile(file); final boolean isInternalFile = fileBackend.isInternalFile(file);
final List<String> uuids = databaseBackend.markFileAsDeleted(file, isInternalFile); final List<String> uuids = databaseBackend.markFileAsDeleted(file, isInternalFile);
Log.d(Config.LOGTAG, "deleted file " + path + " internal=" + isInternalFile + ", database hits=" + uuids.size()); Log.d(Config.LOGTAG, "deleted file " + file.getAbsolutePath() + " internal=" + isInternalFile + ", database hits=" + uuids.size());
markUuidsAsDeletedFiles(uuids); markUuidsAsDeletedFiles(uuids);
} }

63
src/main/java/eu/siacs/conversations/utils/ConversationsFileObserver.java
View file

@ -6,8 +6,11 @@ import android.util.Log;
import java.io.File; import java.io.File;
import java.util.ArrayList; import java.util.ArrayList;
import java.util.Collections;
import java.util.List; import java.util.List;
import java.util.Stack; import java.util.Stack;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicBoolean; import java.util.concurrent.atomic.AtomicBoolean;
import eu.siacs.conversations.Config; import eu.siacs.conversations.Config;
@ -19,6 +22,9 @@ import eu.siacs.conversations.Config;
*/ */
public abstract class ConversationsFileObserver { public abstract class ConversationsFileObserver {
private static final Executor EVENT_EXECUTOR = Executors.newSingleThreadExecutor();
private static final int MASK = FileObserver.DELETE | FileObserver.MOVED_FROM | FileObserver.CREATE;
private final String path; private final String path;
private final List<SingleFileObserver> mObservers = new ArrayList<>(); private final List<SingleFileObserver> mObservers = new ArrayList<>();
@ -34,50 +40,47 @@ public abstract class ConversationsFileObserver {
} }
private synchronized void startWatchingInternal() { private synchronized void startWatchingInternal() {
Stack<String> stack = new Stack<>(); final Stack<String> stack = new Stack<>();
stack.push(path); stack.push(path);
while (!stack.empty()) { while (!stack.empty()) {
if (shouldStop.get()) { if (shouldStop.get()) {
Log.d(Config.LOGTAG,"file observer received command to stop"); Log.d(Config.LOGTAG, "file observer received command to stop");
return; return;
} }
String parent = stack.pop(); final String parent = stack.pop();
mObservers.add(new SingleFileObserver(parent, FileObserver.DELETE| FileObserver.MOVED_FROM));
final File path = new File(parent); final File path = new File(parent);
mObservers.add(new SingleFileObserver(path, MASK));
final File[] files = path.listFiles(); final File[] files = path.listFiles();
if (files == null) { for (final File file : (files == null ? new File[0] : files)) {
continue;
}
for(File file : files) {
if (shouldStop.get()) { if (shouldStop.get()) {
Log.d(Config.LOGTAG,"file observer received command to stop"); Log.d(Config.LOGTAG, "file observer received command to stop");
return; return;
} }
if (file.isDirectory() && file.getName().charAt(0) != '.') { if (file.isDirectory() && file.getName().charAt(0) != '.') {
final String currentPath = file.getAbsolutePath(); final String currentPath = file.getAbsolutePath();
if (depth(file) <= 8 && !stack.contains(currentPath) && !observing(currentPath)) { if (depth(file) <= 8 && !stack.contains(currentPath) && !observing(file)) {
stack.push(currentPath); stack.push(currentPath);
} }
} }
} }
} }
for(FileObserver observer : mObservers) { for (FileObserver observer : mObservers) {
observer.startWatching(); observer.startWatching();
} }
} }
private static int depth(File file) { private static int depth(File file) {
int depth = 0; int depth = 0;
while((file = file.getParentFile()) != null) { while ((file = file.getParentFile()) != null) {
depth++; depth++;
} }
return depth; return depth;
} }
private boolean observing(String path) { private boolean observing(final File path) {
for(SingleFileObserver observer : mObservers) { for (final SingleFileObserver observer : mObservers) {
if(path.equals(observer.path)) { if (path.equals(observer.path)) {
return true; return true;
} }
} }
@ -90,13 +93,13 @@ public abstract class ConversationsFileObserver {
} }
private synchronized void stopWatchingInternal() { private synchronized void stopWatchingInternal() {
for(FileObserver observer : mObservers) { for (FileObserver observer : mObservers) {
observer.stopWatching(); observer.stopWatching();
} }
mObservers.clear(); mObservers.clear();
} }
abstract public void onEvent(int event, String path); abstract public void onEvent(final int event, File path);
public void restartWatching() { public void restartWatching() {
stopWatching(); stopWatching();
@ -104,21 +107,33 @@ public abstract class ConversationsFileObserver {
} }
private class SingleFileObserver extends FileObserver { private class SingleFileObserver extends FileObserver {
private final String path; private final File path;
SingleFileObserver(String path, int mask) { SingleFileObserver(final File path, final int mask) {
super(path, mask); super(path.getAbsolutePath(), mask);
this.path = path; this.path = path;
} }
@Override @Override
public void onEvent(int event, String filename) { public void onEvent(final int event, final String filename) {
if (filename == null) { if (filename == null) {
Log.d(Config.LOGTAG,"ignored file event with NULL filename (event="+event+")"); Log.d(Config.LOGTAG, "ignored file event with NULL filename (event=" + event + ")");
return; return;
} }
ConversationsFileObserver.this.onEvent(event, path+'/'+filename); EVENT_EXECUTOR.execute(() -> {
final File file = new File(this.path, filename);
if ((event & FileObserver.ALL_EVENTS) == FileObserver.CREATE) {
if (file.isDirectory()) {
Log.d(Config.LOGTAG, "file observer observed new directory creation " + file);
if (!observing(file)) {
final SingleFileObserver observer = new SingleFileObserver(file, MASK);
observer.startWatching();
}
}
return;
}
ConversationsFileObserver.this.onEvent(event, file);
});
} }
} }
} }