com.jelurida.ardor.contracts

Class IgnisArdorRates<InvocationData,ReturnedData>

java.lang.Object

nxt.addons.AbstractContract<InvocationData,ReturnedData>

com.jelurida.ardor.contracts.IgnisArdorRates<InvocationData,ReturnedData>

All Implemented Interfaces:

Contract<InvocationData,ReturnedData>

public class IgnisArdorRates<InvocationData,ReturnedData>
extends AbstractContract<InvocationData,ReturnedData>

This sample Oracle contract loads the Ignis per Ardor exchange rate from Bittrex and from the internal coin exchange. It can be used to identify arbitrage opportunities. The contract demonstrates interface with an external service (Bittrex exchange) and how to send a different response when triggered by block, by transaction, by API call. Since the contract interfaces with an external class which loads the exchange rates, it has to be bundled and deployed as a Jar file together with its dependencies to the blockchain.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	IgnisArdorRates.Params

Constructor Summary

Constructors

Constructor and Description
IgnisArdorRates()

Method Summary

Modifier and Type	Method and Description
<T extends TransactionResponse> boolean	isDuplicate(T myTransaction, java.util.List<T> existingUnconfirmedTransactions)
JO	processBlock(BlockContext context) Write the Ignis per Ardor exchange rate to an account property every pre-defined number of blocks defined by the contract parameter "frequency".
JO	processRequest(RequestContext context) Send the exchange rate in response to a simple API call
JO	processTransaction(TransactionContext context) Send the Ignis per Ardor exchange rate as an encrypted message back to the sender of the trigger transaction.

Methods inherited from class nxt.addons.AbstractContract

processInvocation, processVoucher

Methods inherited from class java.lang.Object

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

Methods inherited from interface nxt.addons.Contract

init, minProductVersion, shutdown

Constructor Detail

IgnisArdorRates

public IgnisArdorRates()

Method Detail

processBlock

public JO processBlock(BlockContext context)

Write the Ignis per Ardor exchange rate to an account property every pre-defined number of blocks defined by the contract parameter "frequency".

Specified by:

processBlock in interface Contract<InvocationData,ReturnedData>

Overrides:

processBlock in class AbstractContract<InvocationData,ReturnedData>

Parameters:

context - the block context

processTransaction

public JO processTransaction(TransactionContext context)

Send the Ignis per Ardor exchange rate as an encrypted message back to the sender of the trigger transaction. Note an example of sending encrypted message from the contract account to the trigger transaction sender.

Specified by:

processTransaction in interface Contract<InvocationData,ReturnedData>

Overrides:

processTransaction in class AbstractContract<InvocationData,ReturnedData>

Parameters:

context - the transaction context

processRequest

public JO processRequest(RequestContext context)

Send the exchange rate in response to a simple API call

Specified by:

processRequest in interface Contract<InvocationData,ReturnedData>

Overrides:

processRequest in class AbstractContract<InvocationData,ReturnedData>

Parameters:

context - the api request context

isDuplicate

public <T extends TransactionResponse> boolean isDuplicate(T myTransaction,
                                                           java.util.List<T> existingUnconfirmedTransactions)

Specified by:

isDuplicate in interface Contract<InvocationData,ReturnedData>

Overrides:

isDuplicate in class AbstractContract<InvocationData,ReturnedData>