Thanks @KG and @Andreas for reply
How about if i create a single wallet and distribute addresses of this
wallet to every new signup user. I will attach a coin listener to that
single wallet and identify transaction done to specific user address and
increase balance according to it in database.
With increase in transaction, size of wallet object will increase but it
will be manageable as compare to HashMap.
Also will the below line, generate unique address each time ?
Address address = wallet.freshReceiveAddress();
On Tuesday, November 14, 2017 at 10:12:34 PM UTC+5:30, Andreas Schildbach
wrote:
>
> Ajit, you can attach multiple wallets to a PeerGroup, so you only have
> one PeerGroup, a constant number of peers and one BlockStore. You need
> to keep wallets connected though, or otherwise you'd need to replay the
> whole chain on each reconnect.
>
> You can use bitcoinj for a web application, but it depends on the
> usecase. Bitcoinj is clearly not meant for hosted wallets.
>
>
> On 11/14/2017 02:33 PM, KG wrote:
> > I'd suggest looking for a different approach here. I don't what is the
> > purpose of use here so it's hard to make a recommendation, but if memory
> > serves then each wallet object probably consumes at least 300 MB of RAM
> > due to blockchain related objects (which is why I ultimately moved to
> > different solution for my use case, but I digress). What you could try
> > (and I am no bitcoinj expert) is attempt to make wallets that share
> > block chain related stuff (i.e. block store, blockchain etc.) though I
> > am not sure bitcoinj allows for such approach to be used. Also if it's
> > possible maybe creating a wallet for every user is not necessary.
> >
> > These are my 2 cents on this question. And I am mostly speaking as
> > developer/designer here.
> >
> > On Tuesday, November 14, 2017 at 7:21:23 AM UTC+2, Ajit Soman wrote:
> >
> > Could you suggest any solution for this issue. I have also tried to
> > save wallet object in database using WalletProtoBuf but i was not
> > able to synchronize wallet and also faced issues like balance
> > mismatch and dead transaction , so i revert back to my previous
> > approach (HashMap).
> >
> > Based on your reply bitcoinj is not suitable for creating web
> > application .
> >
> > It would be great, if you could able to suggest some solution to
> > solve this issue because we are using bitcoinj in 4 project . 1
> > project is in production with around 700 users.
> >
> >
> > On Tuesday, November 14, 2017 at 1:00:18 AM UTC+5:30, Andreas
> > Schildbach wrote:
> >
> > It's known issue. Bitcoinj is designed around the assumption of
> > approx.
> > one wallet per device (or at least only a low number). The
> > "webwallet"
> > usecase has always been excluded.
> >
> >
> > On 11/13/2017 06:32 PM, Ajit Soman wrote:
> > > I have a java web application. When ever a user signup i
> > create a wallet
> > > for them. I use the below code to create wallet for user and
> > put that
> > > wallet object in Map<String,Wallet>.
> > >
> > > |
> > > /**
> > > * This is the global map that maintain wallet across
> > application. When ever
> > > * i have to get balance or make transaction i use wallet
> > object in the map.
> > > *
> > > * The main reason for doing this is that Wallet object in map
> > will always
> > > * be in synchronization with the blockchain
> > > */
> > > Map<String,Wallet>applicationWalletMap
> > =newHashMap<String,Wallet>();
> > >
> > >
> > > publicvoidcreateWalletForUser()throwsIOException{
> > > intbits =128;
> > > SecureRandomrandom =newSecureRandom();
> > > DeterministicKeyChaindeterminstickeychain
> > > =newDeterministicKeyChain(random,bits);
> > > DeterministicSeedseed =determinstickeychain.getSeed();
> > > System.out.println("seed "+seed.getSeedBytes());
> > > Walletwallet =Wallet.fromSeed(TestNet3Params.get(),seed);
> > > ECKeyeckey =newECKey();
> > > wallet.importKey(eckey);
> > > StringfileName =UUID.randomUUID().toString();
> > > wallet.saveToFile(newFile("/opt/"+fileName+".dat"));
> > > System.out.println("Wallet has been created");
> > > applicationWalletMap.put(fileName,wallet);
> > > }
> > > |
> > >
> > >
> > >
> > > Also I put all user's synchronized wallet object in
> > > *applicationWalletMap *when i start web application.
> > >
> > > The issue is that when user keep on increasing the size
> > > of *applicationWalletMap *increases. *This consumes a lot of
> > RAM*. So is
> > > there is any efficient way to handle this problem.
> > >
> > > Thanks in advance
> > >
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