ChainDownloadStartedEventListener (bitcoinj-core 0.17-alpha1 API)

All Known Subinterfaces:

BlockchainDownloadEventListener, PeerDataEventListener

All Known Implementing Classes:

DownloadProgressTracker
```
public interface ChainDownloadStartedEventListener
```
Implementors can listen to events like blocks being downloaded/transactions being broadcast/connect/disconnects, they can pre-filter messages before they are processed by a Peer or PeerGroup, and they can provide transactions to remote peers when they ask for them.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`onChainDownloadStarted(Peer peer, int blocksLeft)`	Called when a download is started with the initial number of blocks to be downloaded.

- Method Detail
  - onChainDownloadStarted
```
void onChainDownloadStarted(Peer peer,
                            int blocksLeft)
```
    Called when a download is started with the initial number of blocks to be downloaded.
    
    Parameters:
    
    peer - the peer receiving the block
    
    blocksLeft - the number of blocks left to download