JarCasting
REMME Java Client
An open source Java integration library for REMChain, simplifying the access and interaction with REMME nodes both public or permissioned.
How to use
1. Install and run REMME node with required RPC API modules enabled.
You can check out how to do that at REMME core repo.
2. Add dependency to the project
Using Maven
Add Maven dependency below to the pom.xml file
<dependency>
<groupId>io.remme.java</groupId>
<artifactId>remme-java-lib</artifactId>
<version>1.0.0</version>
</dependency>
Manually
a) Checkout (or download) master branch of the repository
b) Run build command
mvn clean install -DskipTests=true
c) Add created .jar file to your classpath
d) Do not forget to add required dependencies (list of dependencies you can find in the project pom.xml file)
3. Run methods of RemmeClient class to interact with REMME node.
4. Possible errors and solutions
Examples
Implement RemmeClient
String privateKeyHex = "7f752a99bbaf6755dc861bb4a7bb19acb913948d75f3b718ff4545d01d9d4f10";
NetworkConfig networkConfig = new NetworkConfig("localhost:8080", false);
RemmeClient remme = new RemmeClient(ClientInit.builder()
.privateKeyHex(privateKeyHex)
.networkConfig(networkConfig).build());
Tokens
String someAccountPublicKeyInHexFormat = "0306796698d9b14a0ba313acc7fb14f69d8717393af5b02cc292d72009b97d8759";
String someRemmeAddress = Functions.generateAddress(RemmeFamilyName.ACCOUNT, someAccountPublicKeyInHexFormat);
Long balance = remme.getToken().getBalance(someRemmeAddress).get();
System.out.println("Account " + someRemmeAddress + " balance - " + balance + " REM");
BaseTransaction transactionResult = remme.getToken().transfer(someRemmeAddress, 100L);
System.out.println("Sending tokens...BatchId: " + transactionResult.getBatchId());
SocketEventListener transactionCallback = (err, result) -> {
if (err != null) {return;};
System.out.println("token " + new ObjectMapper().writeValueAsString(result));
Long newBalance = await remme.getToken().getBalance(someRemmeAddress).get();
System.out.println("Account " + someRemmeAddress + "balance - " + newBalance + " REM");
transactionResult.closeWebSocket();
};
transactionResult.connectToWebSocket(transactionCallback);
Certificates
ICertificateTransactionResponse certificateTransactionResult = remme.getCertificate().createAndStore(
CreateCertificateDTO.builder()
.commonName("userName1")
.email("user@email.com")
.name("John")
.surname("Smith")
.countryName("US")
.validity(360)
.serial("some serial").build());
SocketEventListener certificateTransactionCallback = (err, response) -> {
if (err != null) return;
System.out.println("certificate" + new ObjectMapper().writeValueAsString(response));
System.out.println("Certificate was saved on REMchain at block number: " + response.getId());
Boolean certificateStatus = remme.getCertificate().check(certificateTransactionResult.getCertificate()).get();
System.out.println("Certificate IsValid = " + certificateStatus);
certificateTransactionResult.closeWebSocket();
};
certificateTransactionResult.connectToWebSocket(certificateTransactionCallback);
Subscribing to Events
RemmeEvents is enums which describe all available events.
remme.getEvents().subscribe(RemmeRequestParams.builder()
.events(RemmeEvents.ATOMIC_SWAP).build(), (err, res) -> {
if (err != null) {
System.out.println(new ObjectMapper().writeValueAsString(err));
return;
}
System.out.println(new ObjectMapper().writeValueAsString(res));
})
Also we give a possibility to start listen events from previous block by providing last known block id
remme.events.subscribe(RemmeRequestParams.builder()
.events(RemmeEvents.ATOMIC_SWAP)
.lastKnownBlockId("db19f0e3b3f001670bebc814e238df48cef059f3f0668f57702ba9ff0c4b8ec45c7298f08b4c2fa67602da27a84b3df5dc78ce0f7774b3d3ae094caeeb9cbc82")
.build(), (err, res) -> {
if (err != null) {
System.out.println(new ObjectMapper().writeValueAsString(err));
return;
}
System.out.println(new ObjectMapper().writeValueAsString(res));
});
Unsubscribe from listening events
remme.getEvents().unsubscribe();
License
REMME software and documentation are licensed under Apache License Version 2.0 <LICENSE>_.
