Package org.web3j.protocol

Interface Web3jService

All Known Implementing Classes:

HttpService, IpcService, Service, UnixIpcService, WebSocketService, WindowsIpcService

public interface Web3jService

Services API.

Method Summary

Modifier and Type	Method	Description
void	close()	Closes resources used by the service.
<T extends Response> T	send(Request request, java.lang.Class<T> responseType)	Perform a synchronous JSON-RPC request.
<T extends Response> java.util.concurrent.CompletableFuture<T>	sendAsync(Request request, java.lang.Class<T> responseType)	Performs an asynchronous JSON-RPC request.
BatchResponse	sendBatch(BatchRequest batchRequest)	Perform a synchronous JSON-RPC batch requests.
java.util.concurrent.CompletableFuture<BatchResponse>	sendBatchAsync(BatchRequest batchRequest)	Performs an asynchronous JSON-RPC batch requests.
<T extends Notification<?>> io.reactivex.Flowable<T>	subscribe(Request request, java.lang.String unsubscribeMethod, java.lang.Class<T> responseType)	Subscribe to a stream of notifications.

Method Detail

send

<T extends Response> T send(Request request,
                            java.lang.Class<T> responseType)
                     throws java.io.IOException

Perform a synchronous JSON-RPC request.

Type Parameters:

T - type of a data item returned by the request

Parameters:

request - request to perform

responseType - class of a data item returned by the request

Returns:

deserialized JSON-RPC response

Throws:

java.io.IOException - thrown if failed to perform a request

sendAsync

<T extends Response> java.util.concurrent.CompletableFuture<T> sendAsync(Request request,
                                                                         java.lang.Class<T> responseType)

Performs an asynchronous JSON-RPC request.

Type Parameters:

T - type of a data item returned by the request

Parameters:

request - request to perform

responseType - class of a data item returned by the request

Returns:

CompletableFuture that will be completed when a result is returned or if a request has failed

sendBatch

BatchResponse sendBatch(BatchRequest batchRequest)
                 throws java.io.IOException

Perform a synchronous JSON-RPC batch requests.

Parameters:

batchRequest - requests to perform

Returns:

deserialized JSON-RPC responses

Throws:

java.io.IOException - thrown if failed to perform a batch request

sendBatchAsync

java.util.concurrent.CompletableFuture<BatchResponse> sendBatchAsync(BatchRequest batchRequest)

Performs an asynchronous JSON-RPC batch requests.

Parameters:

batchRequest - batch request to perform

Returns:

CompletableFuture that will be completed when a result is returned or if a request has failed

subscribe

<T extends Notification<?>> io.reactivex.Flowable<T> subscribe(Request request,
                                                               java.lang.String unsubscribeMethod,
                                                               java.lang.Class<T> responseType)

Subscribe to a stream of notifications. A stream of notifications is opened by by performing a specified JSON-RPC request and is closed by calling the unsubscribe method. Different WebSocket implementations use different pair of subscribe/unsubscribe methods.

This method creates an Flowable that can be used to subscribe to new notifications. When a client unsubscribes from this Flowable the service unsubscribes from the underlying stream of events.

Type Parameters:

T - type of incoming event objects

Parameters:

request - JSON-RPC request that will be send to subscribe to a stream of events

unsubscribeMethod - method that will be called to unsubscribe from a stream of notifications

responseType - class of incoming events objects in a stream

Returns:

a Flowable instance that emits incoming events

close

void close()
    throws java.io.IOException

Closes resources used by the service.

Throws:

java.io.IOException - thrown if a service failed to close all resources