1 package org.ibex.mail.target;
2 import org.prevayler.*;
3 import org.ibex.mail.*;
4 import org.ibex.util.*;
8 import java.nio.channels.*;
13 /** An exceptionally crude implementation of Mailbox relying on POSIXy filesystem semantics */
14 public class FileBasedMailbox extends Mailbox.Default {
16 public static final long MAGIC_DATE = 0;
18 public String toString() { return "[FileBasedMailbox " + path.getAbsolutePath() + "]"; }
19 private static final char slash = File.separatorChar;
20 private static final WeakHashMap<String,FileBasedMailbox> instances = new WeakHashMap<String,FileBasedMailbox>();
21 public Mailbox slash(String name, boolean create) { return getFileBasedMailbox(path.getAbsolutePath()+slash+name, create); }
23 // FIXME: should be a File()
24 public static synchronized FileBasedMailbox getFileBasedMailbox(String path, boolean create) {
26 FileBasedMailbox ret = instances.get(path);
28 if (!create && !(new File(path).exists())) return null;
29 instances.put(path, ret = new FileBasedMailbox(new File(path)));
32 } catch (Exception e) {
33 Log.error(FileBasedMailbox.class, e);
39 // Instance //////////////////////////////////////////////////////////////////////////////
42 private FileLock lock;
43 private Prevayler prevayler;
46 public static class Cache implements Serializable {
47 public final int uidValidity = new Random().nextInt();
48 private final Hashtable<String,Entry> byname = new Hashtable<String,Entry>();
49 private final Hashtable<Integer,Entry> byuid = new Hashtable<Integer,Entry>();
50 private final ArrayList<Entry> linear = new ArrayList<Entry>();
51 public final File dir;
52 private int uidNext = 0;
54 public Cache(File dir) { this.dir = dir; }
56 public void init(final Prevayler prevayler) throws IOException {
58 Log.info(this, "initializing maildir " + dir.getParent());
59 boolean invalid = false;
60 ArrayList<Transaction> kill = new ArrayList<Transaction>();
61 for(String s : byname.keySet()) {
62 String name = dir.getParent() + slash + s;
63 if (!new File(name).exists() && !new File(name+"s").exists()) {
64 Log.error(this, "dropping message " + name);
65 kill.add(new Drop(byname.get(s).uid()));
68 for(Transaction t : kill) prevayler.execute(t);
69 for(String file : new File(dir.getParent()).list())
70 if (file.charAt(0)!='.' && !(new File(dir.getParent() + slash + file).isDirectory())) {
71 if (get(file) == null) new Entry(this, prevayler, file);
72 else if ((new File(dir.getParent() + slash + file).lastModified() == MAGIC_DATE) != get(file).seen())
73 prevayler.execute(new Seen(get(file).uid(), !get(file).seen()));
75 Log.info(this, " done initializing maildir " + dir.getParent());
76 new Thread() { public void run() {
77 try { prevayler.takeSnapshot(); } catch (Exception e) { Log.error(this, e); }
82 public synchronized int size() { return linear.size(); }
83 public synchronized int uidNext(boolean increment) { return increment ? uidNext++ : uidNext; }
84 public synchronized Entry get(int uid) { return byuid.get(uid); }
85 public synchronized Entry getLinear(int num) { return linear.get(num); }
86 public synchronized Entry get(String name) {
87 if (name.endsWith("s")) name = name.substring(0, name.length() - 1);
88 return byname.get(name);
91 public static class Entry implements Serializable {
92 private final byte[] header;
93 public final String name;
97 public MIME.Headers headers() { return new MIME.Headers(new Stream(new ByteArrayInputStream(header)), true); }
98 public Entry(Cache cache, Prevayler prevayler, String name) throws IOException {
99 File f = new File(cache.dir.getParent()+slash+name);
100 final boolean seen = f.lastModified() == MAGIC_DATE;
102 header = new MIME.Headers(new Stream(new FileInputStream(f)), true).toString().getBytes();
103 prevayler.execute(new Transaction() {
104 public void executeOn(Object o, Date now) {
105 Cache cache = (Cache)o;
106 synchronized(cache) {
107 Entry.this.seen = seen;
108 Entry.this.uid = cache.uidNext(true);
109 cache.linear.add(Entry.this);
110 cache.byuid.put(Entry.this.uid, Entry.this);
111 cache.byname.put(Entry.this.name, Entry.this);
115 public int uid() { return uid; }
116 public boolean seen() { return seen; }
117 public void seen(Cache cache, boolean seen) {
118 String base = cache.dir.getParent() + slash + name;
119 File target = new File(base);
120 if (!target.exists()) target = new File(base + "s");
121 target.setLastModified(seen ? MAGIC_DATE : System.currentTimeMillis());
123 public void delete(Cache cache) {
124 String base = cache.dir.getParent() + slash + name;
125 File target = new File(base);
126 if (!target.exists()) target = new File(base + "s");
127 if (target.exists()) target.delete();
129 public Message message(Cache cache) { try {
130 String base = cache.dir.getParent() + slash + name;
131 File target = new File(base);
132 if (!target.exists()) target = new File(base + "s");
133 FileInputStream fis = null;
135 fis = new FileInputStream(target);
136 return new Message(new Stream(fis), new Message.Envelope(null, null, new Date(target.lastModified())));
137 } finally { if (fis != null) fis.close(); }
138 } catch (IOException e) { throw new MailException.IOException(e);
139 } catch (Message.Malformed e) { throw new MailException(e.getMessage()); }
144 private static void rmDashRf(File f) throws IOException {
145 if (!f.isDirectory()) { f.delete(); return; }
146 String[] children = f.list();
147 for(int i=0; i<children.length; i++) rmDashRf(new File(f.getAbsolutePath() + slash + children[i]));
151 private FileBasedMailbox(File path) throws MailException, IOException, ClassNotFoundException {
156 lock = new RandomAccessFile(this.path.getAbsolutePath() + slash + ".lock", "rw").getChannel().tryLock();
157 if (lock == null) throw new IOException("unable to lock FileBasedMailbox");
159 File cacheDir = new File(path.getAbsolutePath() + slash + ".cache");
161 prevayler = PrevaylerFactory.createPrevayler(new Cache(cacheDir), cacheDir.getAbsolutePath());
162 cache = (Cache)prevayler.prevalentSystem();
163 } catch (Throwable t) {
164 Log.warn(this, "error while attempting to reconstitute a FileBasedMailbox.cache:");
166 Log.warn(this, "discarding cache...");
168 prevayler = PrevaylerFactory.createPrevayler(new Cache(cacheDir), cacheDir.getAbsolutePath());
169 cache = (Cache)prevayler.prevalentSystem();
171 cache.init(prevayler);
175 public Mailbox.Iterator iterator() { return new Iterator(); }
176 public int uidValidity() { return cache.uidValidity; }
177 public synchronized void add(Message message) { add(message, Mailbox.Flag.RECENT); }
178 public String[] children() {
180 String[] list = path.list();
181 for(int i=0; i<list.length; i++) {
182 File f = new File(path.getAbsolutePath() + slash + list[i]);
183 if (f.isDirectory() && f.getName().charAt(0) != '.') vec.addElement(list[i]);
185 return (String[])vec.copyInto(new String[vec.size()]);
188 public int uidNext() { return cache.uidNext(false); }
189 public synchronized void add(Message message, int flags) {
190 Log.info(path, message.summary());
192 String name; String fullname; File target; File f;
194 name = cache.uidNext(true) + ".";
195 fullname = path.getAbsolutePath() + slash + name;
196 target = new File(fullname);
197 f = new File(target.getCanonicalPath() + "-");
198 if (!f.exists() && !target.exists()) break;
199 Log.error(this, "aieeee!!!! target of add() already exists: " + target.getAbsolutePath());
201 FileOutputStream fo = new FileOutputStream(f);
202 Stream stream = new Stream(fo);
203 if (message.envelope != null) {
204 stream.println("X-org.ibex.mail.headers.envelope.From: " + message.envelope.from);
205 stream.println("X-org.ibex.mail.headers.envelope.To: " + message.envelope.to);
207 message.dump(stream);
209 f.renameTo(new File(fullname));
210 if ((flags & Mailbox.Flag.SEEN) == Mailbox.Flag.SEEN) f.setLastModified(MAGIC_DATE);
211 new Cache.Entry(cache, prevayler, name);
212 } catch (IOException e) { throw new MailException.IOException(e); }
215 private class Iterator extends Mailbox.Default.Iterator {
217 private Cache.Entry entry() { return cache.getLinear(cur); }
218 public MIME.Headers head() { return done() ? null : entry().headers(); }
219 public boolean done() { return cur >= cache.size(); }
220 public boolean next() { cur++; return !done(); }
221 public boolean seen() { return done() ? false : entry().seen(); }
222 public int num() { return cur+1; } // EUDORA insists that message numbers start at 1, not 0
223 public int uid() { return done() ? -1 : entry().uid(); }
224 public Message cur() { return done() ? null : entry().message(cache); }
225 public void seen(boolean seen) {
226 entry().seen((Cache)prevayler.prevalentSystem(), seen);
227 prevayler.execute(new Seen(uid(), seen));
229 public void delete() {
230 entry().delete((Cache)prevayler.prevalentSystem());
231 prevayler.execute(new Drop(entry().uid()));
235 private static class Seen implements Transaction {
237 private boolean seen;
238 public Seen(int uid, boolean seen) { this.uid = uid; this.seen = seen; }
239 public void executeOn(Object c, Date d) { ((Cache)c).get(uid).seen = seen; }
241 public static class Drop implements Transaction {
243 public Drop(int uid) { this.uid = uid; }
244 public void executeOn(Object o, Date now) {
246 Cache.Entry e = c.get(uid);
247 c.byname.remove(e.name);