+// Copyright 2000-2005 the Contributors, as shown in the revision logs.
+// Licensed under the Apache Public Source License 2.0 ("the License").
+// You may not use this file except in compliance with the License.
+
package org.ibex.mail.target;
+import org.prevayler.*;
import org.ibex.mail.*;
import org.ibex.util.*;
-import org.ibex.mail.*;
+import org.ibex.io.*;
import java.io.*;
+import java.nio.*;
+import java.nio.channels.*;
import java.net.*;
import java.util.*;
import java.text.*;
-// FIXME: uids and messagenums are all messed up
+/** An exceptionally crude implementation of Mailbox relying on POSIXy filesystem semantics */
+public class FileBasedMailbox extends Mailbox.Default {
-public class FileBasedMailbox extends Mailbox {
+ public static final long MAGIC_DATE = 0;
- private String path;
- public FileBasedMailbox(String path) throws MailException { new File(this.path = path).mkdirs(); }
- public Mailbox slash(String name, boolean create) throws MailException { return new FileBasedMailbox(path + "/" + name); }
+ 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() + "]"; }
+ public Mailbox slash(String name, boolean create) { return getFileBasedMailbox(path.getAbsolutePath()+slash+name, create); }
- // FIXME
- public String getName() { return "FOO"; }
-
- protected synchronized void flags(Message m, int newFlags) throws MailException {
+ // FIXME: should be a File()
+ public static synchronized FileBasedMailbox getFileBasedMailbox(String path, boolean create) {
try {
- File f = new File(messageToFile(m).getCanonicalPath() + ".flags");
- PrintWriter pw = new PrintWriter(new OutputStreamWriter(new FileOutputStream(f)));
- if ((newFlags & Flag.DELETED) != 0) pw.print("\\Deleted ");
- if ((newFlags & Flag.SEEN) != 0) pw.print("\\Seen ");
- if ((newFlags & Flag.FLAGGED) != 0) pw.print("\\Flagged ");
- if ((newFlags & Flag.DRAFT) != 0) pw.print("\\Draft ");
- if ((newFlags & Flag.ANSWERED) != 0) pw.print("\\Answered ");
- if ((newFlags & Flag.RECENT) != 0) pw.print("\\Recent ");
- pw.close();
- } catch (IOException e) { throw new MailException.IOException(e); }
+ FileBasedMailbox ret = instances.get(path);
+ if (ret == null) {
+ if (!create && !(new File(path).exists())) return null;
+ instances.put(path, ret = new FileBasedMailbox(new File(path)));
+ }
+ return ret;
+ } catch (Exception e) {
+ Log.error(FileBasedMailbox.class, e);
+ return null;
+ }
}
- protected synchronized int flags(Message m) {
- try {
- File f = new File(messageToFile(m).getCanonicalPath() + ".flags");
- if (!f.exists()) return 0;
- String s = new BufferedReader(new InputStreamReader(new FileInputStream(f))).readLine();
- StringTokenizer st = new StringTokenizer(s);
- int ret = 0;
- while(st.hasMoreTokens()) {
- String s2 = st.nextToken();
- if (s2.equals("\\Deleted")) ret |= Flag.DELETED;
- if (s2.equals("\\Seen")) ret |= Flag.SEEN;
- if (s2.equals("\\Flagged")) ret |= Flag.FLAGGED;
- if (s2.equals("\\Draft")) ret |= Flag.DRAFT;
- if (s2.equals("\\Answered")) ret |= Flag.ANSWERED;
- if (s2.equals("\\Recent")) ret |= Flag.RECENT;
+
+ // 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()));
+ }
}
- return ret;
- } catch (IOException e) { throw new MailException.IOException(e); }
+
+ // 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 MIME.Headers headers() { return new MIME.Headers(new Stream(new ByteArrayInputStream(header)), true); }
+ public Message message(Cache cache) { try {
+ FileInputStream fis = null;
+ try {
+ fis = new FileInputStream(cache.dir.getParent() + slash + name);
+ return Message.newMessage(new Stream(fis));
+ } 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 MIME.Headers(new Stream(new FileInputStream(f)), true).toString().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 = 0;
- public int uidNext() { return uidNext; }
- public int uidValidity() { return 1; }
- public int uid(Message m) { Integer i = (Integer)uidMap.get(m); if (i == null) return -1; return i.intValue(); }
- public int num(Message m) { Integer i = (Integer)numMap.get(m); if (i == null) return -1; return i.intValue(); }
- private File messageToFile(Message message) { return new File(path + File.separatorChar + num(message) + "."); }
-
- public int delete(Message message) throws MailException {
- messageToFile(message).delete();
- uidMap.remove(message);
- numMap.remove(message);
- return -1;
+ // Helpers //////////////////////////////////////////////////////////////////////////////
+
+ private static void rmDashRf(File f) throws IOException {
+ if (!f.isDirectory()) { f.delete(); return; }
+ String[] children = f.list();
+ for(int i=0; i<children.length; i++) rmDashRf(new File(f.getAbsolutePath() + slash + children[i]));
+ f.delete();
}
- public Mailbox.Iterator iterator() { return new FileBasedMailbox.Iterator(); }
- private class Iterator extends Mailbox.Iterator {
- private String[] names;
- public Iterator() { names = new File(path).list(); }
- public Message cur() { return null; }
- public boolean next() { return false; }
- protected int flags() { return 0; }
- protected void flags(int newFlags) { }
- public int uid() { return -1; }
- public int num() { return -1; }
- public void delete() { }
-
- /*
- try {
- //= Integer.parseInt(names[i].substring(0, names[i].length() - 1));
- // FIXME
- } catch (NumberFormatException nfe) {
- Log.warn(FileBasedMailbox.class, "NumberFormatException: " + names[i].substring(0, names[i].length() - 1));
- j--;
- int[] newret = new int[ret.length - 1];
- System.arraycopy(ret, 0, newret, 0, newret.length);
- ret = newret;
- }
+ private FileBasedMailbox(File path) throws MailException, IOException, ClassNotFoundException {
+ this.path = path;
+ path.mkdirs();
+
+ // acquire lock
+ lock = new RandomAccessFile(this.path.getAbsolutePath() + slash + ".lock", "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();
}
- */
+ cache.init(prevayler);
}
- private Hashtable uidMap = new Hashtable();
- private Hashtable numMap = new Hashtable();
- private int numNext = 0;
- public synchronized int add(Message message) throws MailException {
+ 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();
+ String[] list = path.list();
+ for(int i=0; i<list.length; i++) {
+ File f = new File(path.getAbsolutePath() + slash + list[i]);
+ if (f.isDirectory() && f.getName().charAt(0) != '.') vec.addElement(list[i]);
+ }
+ return (String[])vec.copyInto(new String[vec.size()]);
+ }
+
+ public int uidNext() { return cache.uidNext(); }
+ public synchronized void add(Message message, int flags) {
try {
- File target = messageToFile(message);
- File f = new File(target.getCanonicalPath() + ".-");
+ String name, fullname; File target, f;
+ for(int i = cache.uidNext(); ; i++) {
+ name = i + ".";
+ fullname = path.getAbsolutePath() + slash + name;
+ target = new File(fullname);
+ f = new File(target.getCanonicalPath() + "-");
+ if (!f.exists() && !target.exists()) break;
+ Log.error(this, "aieeee!!!! target of add() already exists: " + target.getAbsolutePath());
+ }
FileOutputStream fo = new FileOutputStream(f);
- message.dump(fo);
+ Stream stream = new Stream(fo);
+ message.dump(stream);
fo.close();
- f.renameTo(target);
- uidMap.put(new Integer(uidNext++), message);
- numMap.put(new Integer(numNext++), message);
- return numNext - 1;
+ f.renameTo(new File(fullname));
+ 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 MIME.Headers head() { return done() ? null : entry().headers(); }
+ public boolean done() { return cur >= cache.size(); }
+ public boolean next() { cur++; return !done(); }
+ public boolean seen() { return done() ? false : entry().seen(); }
+ 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); }
}
}
projects / org.ibex.mail.git / blobdiff