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If no messages are added to a batch, don't call BatchWriter.finish() -

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this allows the caller to avoid creating an empty packet by delaying
creation of the packet's header and trailer until something's written
to the packet's body. Changed the return semantics of
DatabaseComponent.generateBatch(ContactId, BatchWriter,
Collection<MessageId>) so that the IDs of messages considered for
inclusion in the batch but no longer sendable are also returned - this
allows the caller to remove them from the set of requested IDs.
This commit is contained in:
akwizgran
2011-07-28 11:17:33 +01:00
parent adee3e121c
commit cee4956b37
3 changed files with 48 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
components/net/sf/briar/db/ReadWriteLockDatabaseComponent.java
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@@ -300,13 +300,11 @@ class ReadWriteLockDatabaseComponent<Txn> extends DatabaseComponentImpl<Txn> {
try {
Txn txn = db.startTransaction();
try {
sent = new ArrayList<MessageId>();
int capacity = b.getCapacity();
Collection<MessageId> sendable =
db.getSendableMessages(txn, c, capacity);
Iterator<MessageId> it = sendable.iterator();
sent = new ArrayList<MessageId>();
while(it.hasNext()) {
MessageId m = it.next();
for(MessageId m : sendable) {
byte[] raw = db.getMessage(txn, m);
if(!b.writeMessage(raw)) break;
bytesSent += raw.length;
@@ -326,9 +324,9 @@ class ReadWriteLockDatabaseComponent<Txn> extends DatabaseComponentImpl<Txn> {
} finally {
messageStatusLock.readLock().unlock();
}
BatchId id = b.finish();
// Record the contents of the batch, unless it's empty
if(sent.isEmpty()) return;
BatchId id = b.finish();
messageStatusLock.writeLock().lock();
try {
Txn txn = db.startTransaction();
@@ -357,7 +355,7 @@ class ReadWriteLockDatabaseComponent<Txn> extends DatabaseComponentImpl<Txn> {
if(!containsContact(c)) throw new NoSuchContactException();
messageLock.readLock().lock();
try {
Collection<MessageId> sent;
Collection<MessageId> sent, considered;
messageStatusLock.readLock().lock();
try{
subscriptionLock.readLock().lock();
@@ -365,13 +363,20 @@ class ReadWriteLockDatabaseComponent<Txn> extends DatabaseComponentImpl<Txn> {
Txn txn = db.startTransaction();
try {
sent = new ArrayList<MessageId>();
considered = new ArrayList<MessageId>();
int bytesSent = 0;
for(MessageId m : requested) {
byte[] raw = db.getMessageIfSendable(txn, c, m);
if(raw == null) continue;
if(!b.writeMessage(raw)) break;
bytesSent += raw.length;
sent.add(m);
// If the message is still sendable, try to add
// it to the batch. If the batch is full, don't
// treat the message as considered, and don't
// try to add any further messages.
if(raw != null) {
if(!b.writeMessage(raw)) break;
bytesSent += raw.length;
sent.add(m);
}
considered.add(m);
}
db.commitTransaction(txn);
} catch(DbException e) {
@@ -387,16 +392,16 @@ class ReadWriteLockDatabaseComponent<Txn> extends DatabaseComponentImpl<Txn> {
} finally {
messageStatusLock.readLock().unlock();
}
BatchId id = b.finish();
// Record the contents of the batch, unless it's empty
if(sent.isEmpty()) return sent;
if(sent.isEmpty()) return considered;
BatchId id = b.finish();
messageStatusLock.writeLock().lock();
try {
Txn txn = db.startTransaction();
try {
db.addOutstandingBatch(txn, c, id, sent);
db.commitTransaction(txn);
return sent;
return considered;
} catch(DbException e) {
db.abortTransaction(txn);
throw e;