Package org.web3j.protocol.core.filters

Class Filter<T>

java.lang.Object

org.web3j.protocol.core.filters.Filter<T>

Direct Known Subclasses:

BlockFilter, BlocksFilter, LogFilter, LogsFilter, PendingTransactionFilter, PendingTransactionsFilter

public abstract class Filter<T>
extends Object

Class for creating managed filter requests with callbacks.

Field Summary

Fields

Modifier and Type	Field	Description
protected Callback<T>	callback
protected ScheduledFuture<?>	schedule
protected final Web3j	web3j

Constructor Summary

Constructors

Constructor	Description
Filter(Web3j web3j, Callback<T> callback)

Method Summary

Modifier and Type	Method	Description
void	cancel()
protected abstract Optional<Request<?,EthLog>>	getFilterLogs(BigInteger filterId)	Retrieves historic filters for the filter with the given id.
protected abstract void	process(List<EthLog.LogResult> logResults)
void	run(ScheduledExecutorService scheduledExecutorService, long blockTime)
protected abstract EthFilter	sendRequest()
protected EthUninstallFilter	uninstallFilter(BigInteger filterId)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

web3j

protected final Web3j web3j

callback

protected Callback<T> callback

schedule

protected ScheduledFuture<?> schedule

Constructor Details

Filter

public Filter(Web3j web3j,
 Callback<T> callback)

Method Details

run

public void run(ScheduledExecutorService scheduledExecutorService,
 long blockTime)

sendRequest

protected abstract EthFilter sendRequest()
                                  throws IOException

Throws:

IOException

process

protected abstract void process(List<EthLog.LogResult> logResults)

cancel

public void cancel()

uninstallFilter

protected EthUninstallFilter uninstallFilter(BigInteger filterId)
                                      throws IOException

Throws:

IOException

getFilterLogs

protected abstract Optional<Request<?,EthLog>> getFilterLogs(BigInteger filterId)

Retrieves historic filters for the filter with the given id. Getting historic logs is not supported by all filters. If not the method should return an empty EthLog object

Parameters:

filterId - Id of the filter for which the historic log should be retrieved

Returns:

Historic logs, or an empty optional if the filter cannot retrieve historic logs