public class FileBasedMailbox extends Mailbox.Default {
public static final long MAGIC_DATE = 0;
-
private static final char slash = File.separatorChar;
private static final WeakHashMap<String,FileBasedMailbox> instances = new WeakHashMap<String,FileBasedMailbox>();
public String toString() { return "[FileBasedMailbox " + path.getAbsolutePath() + "]"; }
}
}
-
// Instance //////////////////////////////////////////////////////////////////////////////
private File path;
private FileLock lock;
- private Prevayler prevayler;
- private Cache cache;
-
- public static class Cache implements Serializable {
- public final int uidValidity = Math.abs(new Random().nextInt());
- private final Hashtable<String,Entry> byname = new Hashtable<String,Entry>();
- private final Hashtable<Integer,Entry> byuid = new Hashtable<Integer,Entry>();
- private final ArrayList<Entry> linear = new ArrayList<Entry>();
- public final File dir;
- private int uidNext = 0;
-
- public Cache(File dir) { this.dir = dir; }
-
- public void init(final Prevayler prevayler) throws IOException {
- dir.mkdirs();
- long time = System.currentTimeMillis();
- Log.info(this, "initializing maildir " + dir.getParent());
-
- // Drop entries whose files have vanished
- ArrayList<Transaction> kill = new ArrayList<Transaction>();
- for(String s : byname.keySet())
- if (!new File(dir.getParent() + slash + s).exists())
- kill.add(byname.get(s).delete(null));
- for(Transaction t : kill) prevayler.execute(t);
-
- // Make entries for new files which have appeared
- for(String file : new File(dir.getParent()).list()) {
- File f = new File(dir.getParent() + slash + file);
- if (file.charAt(0)!='.' && !f.isDirectory()) {
- Entry e = get(file);
- if (e == null)
- prevayler.execute(Entry.create(f));
- else if ((f.lastModified() == MAGIC_DATE) != e.seen())
- prevayler.execute(e.seen(f, !e.seen()));
- }
- }
-
- // Take a snapshot for posterity
- if (System.currentTimeMillis() - time > 1000 * 5)
- Log.info(this, " done initializing maildir " + dir.getParent());
- new Thread() { public void run() {
- try { prevayler.takeSnapshot(); } catch (Exception e) { Log.error(this, e); } } }.start();
- }
-
-
- public synchronized int size() { return linear.size(); }
- public synchronized int uidNext() { return uidNext; }
- public synchronized Entry get(int uid) { return byuid.get(uid); }
- public synchronized Entry getLinear(int num) { return linear.get(num); }
- public synchronized Entry get(String name) { return byname.get(name); }
-
- public static class Entry implements Serializable {
- private final byte[] header;
- public final String name;
- public final int uid;
- private boolean seen;
- private Entry(String name, boolean seen, int uid, byte[] header) {
- this.name = name; this.seen = seen; this.uid = uid; this.header = header; }
-
- // Accessors //////////////////////////////////////////////////////////////////////////////
-
- public boolean seen() { return seen; }
- public Headers headers() { return new Headers(new Stream(new ByteArrayInputStream(header)), true); }
- public Message message(Cache cache) { try {
- FileInputStream fis = null;
- try {
- return Message.newMessage(new Fountain.File(new File(cache.dir.getParent() + slash + name)));
- } finally { if (fis != null) fis.close(); }
- } catch (IOException e) { throw new MailException.IOException(e);
- } catch (Message.Malformed e) { throw new MailException(e.getMessage()); }
- }
-
- // Transactions //////////////////////////////////////////////////////////////////////////////
-
- public static Transaction create(File f) throws IOException {
- final boolean seen = f.lastModified() == MAGIC_DATE;
- final String name = f.getName();
- final byte[] header = new Headers(new Stream(new FileInputStream(f)), true).getString().getBytes();
- return new Transaction() {
- public void executeOn(Object o, Date now) {
- Cache cache = (Cache)o;
- synchronized(cache) {
- Entry e = new Entry(name, seen, cache.uidNext++, header);
- cache.linear.add(e);
- cache.byuid.put(e.uid, e);
- cache.byname.put(e.name, e);
- } } };
- }
-
- public Transaction seen(File f, final boolean seen) {
- f.setLastModified(seen ? MAGIC_DATE : System.currentTimeMillis());
- final int uid = this.uid;
- return new Transaction() {
- public void executeOn(Object o, Date now) {
- Cache cache = (Cache)o;
- synchronized(cache) {
- cache.get(uid).seen = seen;
- } } };
- }
- public Transaction delete(File f) {
- if (f != null && f.exists()) f.delete();
- final int uid = this.uid;
- return new Transaction() {
- public void executeOn(Object o, Date now) {
- Cache cache = (Cache)o;
- synchronized(cache) {
- Cache.Entry e = cache.get(uid);
- cache.byname.remove(e.name);
- cache.linear.remove(e);
- cache.byuid.remove(uid);
- } } };
- }
- }
- }
+ private int uidNext;
+ private int uidValidity;
// Helpers //////////////////////////////////////////////////////////////////////////////
path.mkdirs();
// acquire lock
- lock = new RandomAccessFile(this.path.getAbsolutePath() + slash + ".lock", "rw").getChannel().tryLock();
+ File lockfile = new File(this.path.getAbsolutePath() + slash + ".lock");
+ lock = new RandomAccessFile(lockfile, "rw").getChannel().tryLock();
if (lock == null) throw new IOException("unable to lock FileBasedMailbox");
-
- File cacheDir = new File(path.getAbsolutePath() + slash + ".cache");
- try {
- prevayler = PrevaylerFactory.createPrevayler(new Cache(cacheDir), cacheDir.getAbsolutePath());
- cache = (Cache)prevayler.prevalentSystem();
- } catch (Throwable t) {
- Log.warn(this, "error while attempting to reconstitute a FileBasedMailbox.cache:");
- Log.warn(this, t);
- Log.warn(this, "discarding cache...");
- rmDashRf(cacheDir);
- prevayler = PrevaylerFactory.createPrevayler(new Cache(cacheDir), cacheDir.getAbsolutePath());
- cache = (Cache)prevayler.prevalentSystem();
+ uidValidity = (int)(lockfile.lastModified() & 0xffffffff);
+ uidNext = 0;
+ String[] files = path.list();
+ for(int i=0; i<files.length; i++) {
+ try {
+ if (files[i].indexOf('.') != -1) files[i] = files[i].substring(0, files[i].indexOf('.'));
+ int n = Integer.parseInt(files[i]);
+ if (n>=uidNext) uidNext = n;
+ } catch(Exception e) { /* DELIBERATE */ }
}
- cache.init(prevayler);
}
public Mailbox.Iterator iterator() { return new Iterator(); }
- public int uidValidity() { return cache.uidValidity; }
public synchronized void add(Message message) { add(message, Mailbox.Flag.RECENT); }
public String[] children() {
Vec vec = new Vec();
return (String[])vec.copyInto(new String[vec.size()]);
}
- public int uidNext() { return cache.uidNext(); }
+ public int uidValidity() { return uidValidity; }
+ public int uidNext() { return uidNext; }
public synchronized void add(Message message, int flags) {
try {
String name, fullname; File target, f;
- for(int i = cache.uidNext(); ; i++) {
+ for(int i = uidNext; ; i++) {
name = i + ".";
fullname = path.getAbsolutePath() + slash + name;
target = new File(fullname);
message.getStream().transcribe(stream);
stream.close();
f.renameTo(new File(fullname));
+ uidNext++;
f = new File(fullname);
if ((flags & Mailbox.Flag.SEEN) == Mailbox.Flag.SEEN) f.setLastModified(MAGIC_DATE);
- prevayler.execute(Cache.Entry.create(f));
} catch (IOException e) { throw new MailException.IOException(e); }
Log.info(this, path + " <= " + message.summary());
}
private class Iterator extends Mailbox.Default.Iterator {
int cur = -1;
- private Cache.Entry entry() { return cache.getLinear(cur); }
- private File file() { return new File(cache.dir.getParent() + slash + entry().name); }
- public Headers head() { return done() ? null : entry().headers(); }
- public boolean done() { return cur >= cache.size(); }
+ String[] files = path.list(new FilenameFilter() { public boolean accept(File dir, String name) {
+ return name.endsWith(".");
+ } });
+ private File file() { return new File(path.getAbsolutePath() + slash + files[cur]); }
+ public boolean done() { return cur >= files.length; }
public boolean next() { cur++; return !done(); }
- public boolean seen() { return done() ? false : entry().seen(); }
+ public boolean seen() { return false; }
public boolean recent() { return false; }
public int num() { return cur+1; } // EUDORA insists that message numbers start at 1, not 0
- public int uid() { return done() ? -1 : entry().uid; }
- public void delete() { prevayler.execute(entry().delete(file())); }
- public void seen(boolean seen) { prevayler.execute(entry().seen(file(), seen)); }
- public Message cur() { return entry().message(cache); }
+ public int uid() { return done() ? -1 : Integer.parseInt(files[cur].substring(0, files[cur].length()-1)); }
+ public void delete() { File f = file(); if (f != null && f.exists()) f.delete(); }
+ public void seen(boolean seen) { }
+ public Headers head() {
+ if (done()) return null;
+ FileInputStream fis = null;
+ try {
+ return new Headers(new Stream(new FileInputStream(file())));
+ } catch (IOException e) { throw new MailException.IOException(e);
+ } finally { if (fis != null) try { fis.close(); } catch (Exception e) { /* DELIBERATE */ } }
+ }
+ public Message cur() {
+ FileInputStream fis = null;
+ try {
+ return Message.newMessage(new Fountain.File(file()));
+ //} catch (IOException e) { throw new MailException.IOException(e);
+ } catch (Message.Malformed e) { throw new MailException(e.getMessage());
+ } finally { if (fis != null) try { fis.close(); } catch (Exception e) { /* DELIBERATE */ } }
+ }
}
-
}
projects / org.ibex.mail.git / commitdiff