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Ethereum Blockchain Beans

Enables you to do calls into the Ethereum blockchain as a specific activity.

Ethereum Activity Editor

Simple Ethereum call element. Process Request Tab

Request - Contract

The contract combo box lists all Ethereum contract classes that could be found in the classpath. Ethereum contract Java classes extend the abstract Web3j class org.web3j.tx.Contract.

Request - Function

The function combo box lists all methods defined by the chosen Ethereum contract class (besides the technical methods load() and deploy()). Once a method is chosen the method parameters will be shown in the Attribute table.

Request - Properties

In order to execute a function of the Ethereum contract, some properties must be set. Property values can be scripted.

The following attributes must be set:

  • Credentials - The file containing the private key.
  • NetworkUrl - The Ethereum network URL, e.g. "https://rinkeby.infura.io" to connect to the rinkeby test blockchain.
  • Password - The password to open the Credentials file.

The following property is optional:

  • ContractAddress - The actual blockchain contract address, e.g. "0xC1bC19772567083d5C02EF12EA4Ae36B2f8b32C1".

If no ContractAddress is provided, the Ethereum Activity code will deploy the contract on-the-fly.

Request - Attributes

The Attributes table will show the Ethereum method parameters, once a function is chosen. The values in the Expression column can be scripted.

Response - Attributes

The Attributes table in the Response tab shows the output data structure. Process Response Tab

The values in the Expression column can be scripted, the method return parameter will always be mapped to the variable result.

Installation

  1. Download the latest supplement.blockchain.beans-X.Y.Z-SNAPSHOT.jar from the latest release.
  2. Copy the generated JAR into the 'dropins' directory of your Axon.ivy Designer (7.2.0.58791 or later).
  3. Open a process and use the additional Ethereum bean provided in the Blockchain drawer of Process Editor palette.