org.web3j.abi.EventEncoder Java Examples

public static EventValues staticExtractEventParameters(
        Event event, Log log) {

    List<String> topics = log.getTopics();
    String encodedEventSignature = EventEncoder.encode(event);
    if (topics == null || topics.size() == 0 || !topics.get(0).equals(encodedEventSignature)) {
        return null;
    }

    List<Type> indexedValues = new ArrayList<>();
    List<Type> nonIndexedValues = FunctionReturnDecoder.decode(
            log.getData(), event.getNonIndexedParameters());

    List<TypeReference<Type>> indexedParameters = event.getIndexedParameters();
    for (int i = 0; i < indexedParameters.size(); i++) {
        Type value = FunctionReturnDecoder.decodeIndexedValue(
                topics.get(i + 1), indexedParameters.get(i));
        indexedValues.add(value);
    }
    return new EventValues(indexedValues, nonIndexedValues);
}
 

public static EventValues staticExtractEventParameters(
        Event event, Log log) {

    List<String> topics = log.getTopics();
    String encodedEventSignature = EventEncoder.encode(event);
    if (!topics.get(0).equals(encodedEventSignature)) {
        return null;
    }

    List<Type> indexedValues = new ArrayList<>();
    List<Type> nonIndexedValues = FunctionReturnDecoder.decode(
            log.getData(), event.getNonIndexedParameters());

    List<TypeReference<Type>> indexedParameters = event.getIndexedParameters();
    for (int i = 0; i < indexedParameters.size(); i++) {
        Type value = FunctionReturnDecoder.decodeIndexedValue(
                topics.get(i + 1), indexedParameters.get(i));
        indexedValues.add(value);
    }
    return new EventValues(indexedValues, nonIndexedValues);
}
 

MethodSpec buildDefaultEventObservableFunction(
        String responseClassName,
        String functionName) {

    String generatedFunctionName =
            Strings.lowercaseFirstLetter(functionName) + "EventObservable";
    ParameterizedTypeName parameterizedTypeName = ParameterizedTypeName.get(ClassName.get(rx
            .Observable.class), ClassName.get("", responseClassName));

    MethodSpec.Builder observableMethodBuilder =
            MethodSpec.methodBuilder(generatedFunctionName)
                    .addModifiers(Modifier.PUBLIC)
                    .addParameter(DefaultBlockParameter.class, START_BLOCK)
                    .addParameter(DefaultBlockParameter.class, END_BLOCK)
                    .returns(parameterizedTypeName);

    observableMethodBuilder.addStatement("$1T filter = new $1T($2L, $3L, "
            + "getContractAddress())", EthFilter.class, START_BLOCK, END_BLOCK)
            .addStatement("filter.addSingleTopic($T.encode("
                    + buildEventDefinitionName(functionName) + "))", EventEncoder.class)
            .addStatement("return " + generatedFunctionName + "(filter)");

    return observableMethodBuilder
            .build();
}
 

public Observable<NameChangedEventResponse> nameChangedEventObservable(DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
    final Event event = new Event("NameChanged", 
            Arrays.<TypeReference<?>>asList(new TypeReference<Bytes32>() {}),
            Arrays.<TypeReference<?>>asList(new TypeReference<Utf8String>() {}));
    EthFilter filter = new EthFilter(startBlock, endBlock, getContractAddress());
    filter.addSingleTopic(EventEncoder.encode(event));
    return web3j.ethLogObservable(filter).map(new Func1<Log, NameChangedEventResponse>() {
        @Override
        public NameChangedEventResponse call(Log log) {
            EventValues eventValues = extractEventParameters(event, log);
            NameChangedEventResponse typedResponse = new NameChangedEventResponse();
            typedResponse.node = (byte[]) eventValues.getIndexedValues().get(0).getValue();
            typedResponse.name = (String) eventValues.getNonIndexedValues().get(0).getValue();
            return typedResponse;
        }
    });
}
 

public Observable<ABIChangedEventResponse> aBIChangedEventObservable(DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
    final Event event = new Event("ABIChanged", 
            Arrays.<TypeReference<?>>asList(new TypeReference<Bytes32>() {}, new TypeReference<Uint256>() {}),
            Arrays.<TypeReference<?>>asList());
    EthFilter filter = new EthFilter(startBlock, endBlock, getContractAddress());
    filter.addSingleTopic(EventEncoder.encode(event));
    return web3j.ethLogObservable(filter).map(new Func1<Log, ABIChangedEventResponse>() {
        @Override
        public ABIChangedEventResponse call(Log log) {
            EventValues eventValues = extractEventParameters(event, log);
            ABIChangedEventResponse typedResponse = new ABIChangedEventResponse();
            typedResponse.node = (byte[]) eventValues.getIndexedValues().get(0).getValue();
            typedResponse.contentType = (BigInteger) eventValues.getIndexedValues().get(1).getValue();
            return typedResponse;
        }
    });
}
 

public Observable<PubkeyChangedEventResponse> pubkeyChangedEventObservable(DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
    final Event event = new Event("PubkeyChanged", 
            Arrays.<TypeReference<?>>asList(new TypeReference<Bytes32>() {}),
            Arrays.<TypeReference<?>>asList(new TypeReference<Bytes32>() {}, new TypeReference<Bytes32>() {}));
    EthFilter filter = new EthFilter(startBlock, endBlock, getContractAddress());
    filter.addSingleTopic(EventEncoder.encode(event));
    return web3j.ethLogObservable(filter).map(new Func1<Log, PubkeyChangedEventResponse>() {
        @Override
        public PubkeyChangedEventResponse call(Log log) {
            EventValues eventValues = extractEventParameters(event, log);
            PubkeyChangedEventResponse typedResponse = new PubkeyChangedEventResponse();
            typedResponse.node = (byte[]) eventValues.getIndexedValues().get(0).getValue();
            typedResponse.x = (byte[]) eventValues.getNonIndexedValues().get(0).getValue();
            typedResponse.y = (byte[]) eventValues.getNonIndexedValues().get(1).getValue();
            return typedResponse;
        }
    });
}
 

public Observable<TextChangedEventResponse> textChangedEventObservable(DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
    final Event event = new Event("TextChanged", 
            Arrays.<TypeReference<?>>asList(new TypeReference<Bytes32>() {}, new TypeReference<Utf8String>() {}),
            Arrays.<TypeReference<?>>asList(new TypeReference<Utf8String>() {}));
    EthFilter filter = new EthFilter(startBlock, endBlock, getContractAddress());
    filter.addSingleTopic(EventEncoder.encode(event));
    return web3j.ethLogObservable(filter).map(new Func1<Log, TextChangedEventResponse>() {
        @Override
        public TextChangedEventResponse call(Log log) {
            EventValues eventValues = extractEventParameters(event, log);
            TextChangedEventResponse typedResponse = new TextChangedEventResponse();
            typedResponse.node = (byte[]) eventValues.getIndexedValues().get(0).getValue();
            typedResponse.indexedKey = (String) eventValues.getIndexedValues().get(1).getValue();
            typedResponse.key = (String) eventValues.getNonIndexedValues().get(0).getValue();
            return typedResponse;
        }
    });
}
 

public static void observeContractEvent(Web3j web3j,
                                        String contractEventName,
                                        String contractAddress,
                                        List<TypeReference<?>> indexedParameters,
                                        List<TypeReference<?>> nonIndexedParameters,
                                        String eventReturnType,
                                        rx.functions.Action1 action1) {

    Event event = new Event(contractEventName,
                            indexedParameters,
                            nonIndexedParameters);

    EthFilter filter = new EthFilter(DefaultBlockParameterName.EARLIEST,
                                     DefaultBlockParameterName.LATEST,
                                     contractAddress);

    filter.addSingleTopic(EventEncoder.encode(event));

    Class<Type> type = (Class<Type>) AbiTypes.getType(eventReturnType);
    TypeReference<Type> typeRef = TypeReference.create(type);

    web3j.ethLogObservable(filter).subscribe(action1);
}
 

public Observable<TransferEventResponse> transferEventObservable(DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
    final Event event = new Event("Transfer", 
            Arrays.<TypeReference<?>>asList(new TypeReference<Bytes32>() {}),
            Arrays.<TypeReference<?>>asList(new TypeReference<Address>() {}));
    EthFilter filter = new EthFilter(startBlock, endBlock, getContractAddress());
    filter.addSingleTopic(EventEncoder.encode(event));
    return web3j.ethLogObservable(filter).map(new Func1<Log, TransferEventResponse>() {
        @Override
        public TransferEventResponse call(Log log) {
            EventValues eventValues = extractEventParameters(event, log);
            TransferEventResponse typedResponse = new TransferEventResponse();
            typedResponse.node = (byte[]) eventValues.getIndexedValues().get(0).getValue();
            typedResponse.owner = (String) eventValues.getNonIndexedValues().get(0).getValue();
            return typedResponse;
        }
    });
}
 

public Observable<NewResolverEventResponse> newResolverEventObservable(DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
    final Event event = new Event("NewResolver", 
            Arrays.<TypeReference<?>>asList(new TypeReference<Bytes32>() {}),
            Arrays.<TypeReference<?>>asList(new TypeReference<Address>() {}));
    EthFilter filter = new EthFilter(startBlock, endBlock, getContractAddress());
    filter.addSingleTopic(EventEncoder.encode(event));
    return web3j.ethLogObservable(filter).map(new Func1<Log, NewResolverEventResponse>() {
        @Override
        public NewResolverEventResponse call(Log log) {
            EventValues eventValues = extractEventParameters(event, log);
            NewResolverEventResponse typedResponse = new NewResolverEventResponse();
            typedResponse.node = (byte[]) eventValues.getIndexedValues().get(0).getValue();
            typedResponse.resolver = (String) eventValues.getNonIndexedValues().get(0).getValue();
            return typedResponse;
        }
    });
}
 

public Observable<NewTTLEventResponse> newTTLEventObservable(DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
    final Event event = new Event("NewTTL", 
            Arrays.<TypeReference<?>>asList(new TypeReference<Bytes32>() {}),
            Arrays.<TypeReference<?>>asList(new TypeReference<Uint64>() {}));
    EthFilter filter = new EthFilter(startBlock, endBlock, getContractAddress());
    filter.addSingleTopic(EventEncoder.encode(event));
    return web3j.ethLogObservable(filter).map(new Func1<Log, NewTTLEventResponse>() {
        @Override
        public NewTTLEventResponse call(Log log) {
            EventValues eventValues = extractEventParameters(event, log);
            NewTTLEventResponse typedResponse = new NewTTLEventResponse();
            typedResponse.node = (byte[]) eventValues.getIndexedValues().get(0).getValue();
            typedResponse.ttl = (BigInteger) eventValues.getNonIndexedValues().get(0).getValue();
            return typedResponse;
        }
    });
}
 

public Observable<AddrChangedEventResponse> addrChangedEventObservable(DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
    final Event event = new Event("AddrChanged", 
            Arrays.<TypeReference<?>>asList(new TypeReference<Bytes32>() {}),
            Arrays.<TypeReference<?>>asList(new TypeReference<Address>() {}));
    EthFilter filter = new EthFilter(startBlock, endBlock, getContractAddress());
    filter.addSingleTopic(EventEncoder.encode(event));
    return web3j.ethLogObservable(filter).map(new Func1<Log, AddrChangedEventResponse>() {
        @Override
        public AddrChangedEventResponse call(Log log) {
            EventValues eventValues = extractEventParameters(event, log);
            AddrChangedEventResponse typedResponse = new AddrChangedEventResponse();
            typedResponse.node = (byte[]) eventValues.getIndexedValues().get(0).getValue();
            typedResponse.a = (String) eventValues.getNonIndexedValues().get(0).getValue();
            return typedResponse;
        }
    });
}
 

public Observable<ContentChangedEventResponse> contentChangedEventObservable(DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
    final Event event = new Event("ContentChanged", 
            Arrays.<TypeReference<?>>asList(new TypeReference<Bytes32>() {}),
            Arrays.<TypeReference<?>>asList(new TypeReference<Bytes32>() {}));
    EthFilter filter = new EthFilter(startBlock, endBlock, getContractAddress());
    filter.addSingleTopic(EventEncoder.encode(event));
    return web3j.ethLogObservable(filter).map(new Func1<Log, ContentChangedEventResponse>() {
        @Override
        public ContentChangedEventResponse call(Log log) {
            EventValues eventValues = extractEventParameters(event, log);
            ContentChangedEventResponse typedResponse = new ContentChangedEventResponse();
            typedResponse.node = (byte[]) eventValues.getIndexedValues().get(0).getValue();
            typedResponse.hash = (byte[]) eventValues.getNonIndexedValues().get(0).getValue();
            return typedResponse;
        }
    });
}
 

public Observable<BurnEventResponse> burnEventObservable(DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
    final Event event = new Event("Burn", 
            Arrays.<TypeReference<?>>asList(new TypeReference<Address>() {}),
            Arrays.<TypeReference<?>>asList(new TypeReference<Uint256>() {}));
    EthFilter filter = new EthFilter(startBlock, endBlock, getContractAddress());
    filter.addSingleTopic(EventEncoder.encode(event));
    return web3j.ethLogObservable(filter).map(new Func1<Log, BurnEventResponse>() {
        @Override
        public BurnEventResponse call(Log log) {
            EventValues eventValues = extractEventParameters(event, log);
            BurnEventResponse typedResponse = new BurnEventResponse();
            typedResponse.from = (String) eventValues.getIndexedValues().get(0).getValue();
            typedResponse.value = (BigInteger) eventValues.getNonIndexedValues().get(0).getValue();
            return typedResponse;
        }
    });
}
 

public static EventValues staticExtractEventParameters(Event event, Log log) {
    final List<String> topics = log.getTopics();
    String encodedEventSignature = EventEncoder.encode(event);
    if (topics == null || topics.size() == 0 || !topics.get(0).equals(encodedEventSignature)) {
        return null;
    }

    List<Type> indexedValues = new ArrayList<>();
    List<Type> nonIndexedValues =
            FunctionReturnDecoder.decode(log.getData(), event.getNonIndexedParameters());

    List<TypeReference<Type>> indexedParameters = event.getIndexedParameters();
    for (int i = 0; i < indexedParameters.size(); i++) {
        Type value =
                FunctionReturnDecoder.decodeIndexedValue(
                        topics.get(i + 1), indexedParameters.get(i));
        indexedValues.add(value);
    }
    return new EventValues(indexedValues, nonIndexedValues);
}
 

public Observable<TransferEventResponse> transferEventObservable(DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
    final Event event = new Event("Transfer", 
            Arrays.<TypeReference<?>>asList(new TypeReference<Address>() {}, new TypeReference<Address>() {}),
            Arrays.<TypeReference<?>>asList(new TypeReference<Uint256>() {}));
    EthFilter filter = new EthFilter(startBlock, endBlock, getContractAddress());
    filter.addSingleTopic(EventEncoder.encode(event));
    return web3j.ethLogObservable(filter).map(new Func1<Log, TransferEventResponse>() {
        @Override
        public TransferEventResponse call(Log log) {
            EventValues eventValues = extractEventParameters(event, log);
            TransferEventResponse typedResponse = new TransferEventResponse();
            typedResponse.from = (String) eventValues.getIndexedValues().get(0).getValue();
            typedResponse.to = (String) eventValues.getIndexedValues().get(1).getValue();
            typedResponse.value = (BigInteger) eventValues.getNonIndexedValues().get(0).getValue();
            return typedResponse;
        }
    });
}
 

MethodSpec buildDefaultEventObservableFunction(
        String responseClassName,
        String functionName) {

    String generatedFunctionName =
            Strings.lowercaseFirstLetter(functionName) + "EventObservable";
    ParameterizedTypeName parameterizedTypeName = ParameterizedTypeName.get(ClassName.get(rx
            .Observable.class), ClassName.get("", responseClassName));

    MethodSpec.Builder observableMethodBuilder =
            MethodSpec.methodBuilder(generatedFunctionName)
                    .addModifiers(Modifier.PUBLIC)
                    .addParameter(DefaultBlockParameter.class, START_BLOCK)
                    .addParameter(DefaultBlockParameter.class, END_BLOCK)
                    .returns(parameterizedTypeName);

    observableMethodBuilder.addStatement("$1T filter = new $1T($2L, $3L, "
            + "getContractAddress())", PlatonFilter.class, START_BLOCK, END_BLOCK)
            .addStatement("filter.addSingleTopic($T.encode("
                    + buildEventDefinitionName(functionName) + "))", EventEncoder.class)
            .addStatement("return " + generatedFunctionName + "(filter)");

    return observableMethodBuilder
            .build();
}
 

@Override
public String encodedEvent() {
    Event event =
            new Event(
                    "Notify",
                    Arrays.asList(
                            new TypeReference<Uint>(true) {}, new TypeReference<Uint>() {}));

    return EventEncoder.encode(event);
}
 

private void sendTransferTokensTransaction(
        Credentials credentials, String to, String contractAddress, BigInteger qty)
        throws Exception {

    Function function = transfer(to, qty);
    String functionHash = execute(credentials, function, contractAddress);

    TransactionReceipt transferTransactionReceipt =
            waitForTransactionReceipt(functionHash);
    assertThat(transferTransactionReceipt.getTransactionHash(), is(functionHash));

    List<Log> logs = transferTransactionReceipt.getLogs();
    assertFalse(logs.isEmpty());
    Log log = logs.get(0);

    // verify the event was called with the function parameters
    List<String> topics = log.getTopics();
    assertThat(topics.size(), is(3));

    Event transferEvent = transferEvent();

    // check function signature - we only have a single topic our event signature,
    // there are no indexed parameters in this example
    String encodedEventSignature = EventEncoder.encode(transferEvent);
    assertThat(topics.get(0), is(encodedEventSignature));
    assertThat(new Address(topics.get(1)), is(new Address(credentials.getAddress())));
    assertThat(new Address(topics.get(2)), is(new Address(to)));

    // verify qty transferred
    List<Type> results = FunctionReturnDecoder.decode(
            log.getData(), transferEvent.getNonIndexedParameters());
    assertThat(results, equalTo(Collections.singletonList(new Uint256(qty))));
}
 

public void sendTransferFromTransaction(
        Credentials credentials,
        String from,
        String to,
        BigInteger value,
        String contractAddress)
        throws Exception {

    Function function = transferFrom(from, to, value);
    String functionHash = execute(credentials, function, contractAddress);

    TransactionReceipt transferTransactionReceipt = waitForTransactionReceipt(functionHash);
    assertEquals(transferTransactionReceipt.getTransactionHash(), (functionHash));

    List<Log> logs = transferTransactionReceipt.getLogs();
    assertFalse(logs.isEmpty());
    Log log = logs.get(0);

    Event transferEvent = transferEvent();
    List<String> topics = log.getTopics();

    // check function signature - we only have a single topic our event signature,
    // there are no indexed parameters in this example
    String encodedEventSignature = EventEncoder.encode(transferEvent);
    assertEquals(topics.get(0), (encodedEventSignature));
    assertEquals(new Address(topics.get(1)), (new Address(from)));
    assertEquals(new Address(topics.get(2)), (new Address(to)));

    // verify qty transferred
    List<Type> results =
            FunctionReturnDecoder.decode(
                    log.getData(), transferEvent.getNonIndexedParameters());
    assertEquals(results, (Collections.singletonList(new Uint256(value))));
}
 

private void sendApproveTransaction(
        Credentials credentials, String spender, BigInteger value,
        String contractAddress) throws Exception {
    Function function = approve(spender, value);
    String functionHash = execute(credentials, function, contractAddress);

    TransactionReceipt transferTransactionReceipt =
            waitForTransactionReceipt(functionHash);
    assertThat(transferTransactionReceipt.getTransactionHash(), is(functionHash));

    List<Log> logs = transferTransactionReceipt.getLogs();
    assertFalse(logs.isEmpty());
    Log log = logs.get(0);

    // verify the event was called with the function parameters
    List<String> topics = log.getTopics();
    assertThat(topics.size(), is(3));

    // event Transfer(address indexed _from, address indexed _to, uint256 _value);
    Event event = approvalEvent();

    // check function signature - we only have a single topic our event signature,
    // there are no indexed parameters in this example
    String encodedEventSignature = EventEncoder.encode(event);
    assertThat(topics.get(0), is(encodedEventSignature));
    assertThat(new Address(topics.get(1)), is(new Address(credentials.getAddress())));
    assertThat(new Address(topics.get(2)), is(new Address(spender)));

    // verify our two event parameters
    List<Type> results = FunctionReturnDecoder.decode(
            log.getData(), event.getNonIndexedParameters());
    assertThat(results, equalTo(Collections.singletonList(new Uint256(value))));
}
 

private void sendApproveTransaction(
        Credentials credentials, String spender, BigInteger value, String contractAddress)
        throws Exception {
    Function function = approve(spender, value);
    String functionHash = execute(credentials, function, contractAddress);

    TransactionReceipt transferTransactionReceipt = waitForTransactionReceipt(functionHash);
    assertEquals(transferTransactionReceipt.getTransactionHash(), (functionHash));

    List<Log> logs = transferTransactionReceipt.getLogs();
    assertFalse(logs.isEmpty());
    Log log = logs.get(0);

    // verify the event was called with the function parameters
    List<String> topics = log.getTopics();
    assertEquals(topics.size(), (3));

    // event Transfer(address indexed _from, address indexed _to, uint256 _value);
    Event event = approvalEvent();

    // check function signature - we only have a single topic our event signature,
    // there are no indexed parameters in this example
    String encodedEventSignature = EventEncoder.encode(event);
    assertEquals(topics.get(0), (encodedEventSignature));
    assertEquals(new Address(topics.get(1)), (new Address(credentials.getAddress())));
    assertEquals(new Address(topics.get(2)), (new Address(spender)));

    // verify our two event parameters
    List<Type> results =
            FunctionReturnDecoder.decode(log.getData(), event.getNonIndexedParameters());
    assertEquals(results, (Collections.singletonList(new Uint256(value))));
}
 

private void sendTransferTokensTransaction(
        Credentials credentials, String to, String contractAddress, BigInteger qty)
        throws Exception {

    Function function = transfer(to, qty);
    String functionHash = execute(credentials, function, contractAddress);

    TransactionReceipt transferTransactionReceipt = waitForTransactionReceipt(functionHash);
    assertEquals(transferTransactionReceipt.getTransactionHash(), (functionHash));

    List<Log> logs = transferTransactionReceipt.getLogs();
    assertFalse(logs.isEmpty());
    Log log = logs.get(0);

    // verify the event was called with the function parameters
    List<String> topics = log.getTopics();
    assertEquals(topics.size(), (3));

    Event transferEvent = transferEvent();

    // check function signature - we only have a single topic our event signature,
    // there are no indexed parameters in this example
    String encodedEventSignature = EventEncoder.encode(transferEvent);
    assertEquals(topics.get(0), (encodedEventSignature));
    assertEquals(new Address(topics.get(1)), (new Address(credentials.getAddress())));
    assertEquals(new Address(topics.get(2)), (new Address(to)));

    // verify qty transferred
    List<Type> results =
            FunctionReturnDecoder.decode(
                    log.getData(), transferEvent.getNonIndexedParameters());
    assertEquals(results, (Collections.singletonList(new Uint256(qty))));
}
 

public SafeFuture<List<DepositEventEventResponse>> depositEventInRange(
    DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
  final EthFilter filter = new EthFilter(startBlock, endBlock, getContractAddress());
  filter.addSingleTopic(EventEncoder.encode(DEPOSITEVENT_EVENT));
  return SafeFuture.of(
      web3j
          .ethGetLogs(filter)
          .sendAsync()
          .thenApply(
              logs ->
                  logs.getLogs().stream()
                      .map(log -> (Log) log.get())
                      .map(this::convertLogToDepositEventEventResponse)
                      .collect(Collectors.toList())));
}
 

@Test
public void testExtractEventParametersWithLogGivenATransactionReceipt() {

    final java.util.function.Function<String, Event> eventFactory = name ->
            new Event(name, emptyList());

    final BiFunction<Integer, Event, Log> logFactory = (logIndex, event) ->
            new Log(false, "" + logIndex, "0", "0x0", "0x0", "0", "0x" + logIndex, "", "",
                    singletonList(EventEncoder.encode(event)));

    final Event testEvent1 = eventFactory.apply("TestEvent1");
    final Event testEvent2 = eventFactory.apply("TestEvent2");

    final List<Log> logs = Arrays.asList(
            logFactory.apply(0, testEvent1),
            logFactory.apply(1, testEvent2)
    );

    final TransactionReceipt transactionReceipt = new TransactionReceipt();
    transactionReceipt.setLogs(logs);

    final List<Contract.EventValuesWithLog> eventValuesWithLogs1 =
            contract.extractEventParametersWithLog(testEvent1, transactionReceipt);

    assertEquals(eventValuesWithLogs1.size(), 1);
    assertEquals(eventValuesWithLogs1.get(0).getLog(), logs.get(0));

    final List<Contract.EventValuesWithLog> eventValuesWithLogs2 =
            contract.extractEventParametersWithLog(testEvent2, transactionReceipt);

    assertEquals(eventValuesWithLogs2.size(), 1);
    assertEquals(eventValuesWithLogs2.get(0).getLog(), logs.get(1));
}
 

public void sendTransferFromTransaction(
        Credentials credentials, String from, String to, BigInteger value,
        String contractAddress) throws Exception {

    Function function = transferFrom(from, to, value);
    String functionHash = execute(credentials, function, contractAddress);

    TransactionReceipt transferTransactionReceipt =
            waitForTransactionReceipt(functionHash);
    assertThat(transferTransactionReceipt.getTransactionHash(), is(functionHash));

    List<Log> logs = transferTransactionReceipt.getLogs();
    assertFalse(logs.isEmpty());
    Log log = logs.get(0);

    Event transferEvent = transferEvent();
    List<String> topics = log.getTopics();

    // check function signature - we only have a single topic our event signature,
    // there are no indexed parameters in this example
    String encodedEventSignature = EventEncoder.encode(transferEvent);
    assertThat(topics.get(0), is(encodedEventSignature));
    assertThat(new Address(topics.get(1)), is(new Address(from)));
    assertThat(new Address(topics.get(2)), is(new Address(to)));

    // verify qty transferred
    List<Type> results = FunctionReturnDecoder.decode(
            log.getData(), transferEvent.getNonIndexedParameters());
    assertThat(results, equalTo(Collections.singletonList(new Uint256(value))));
}
 

@Test
public void testExtractEventParametersWithLogGivenATransactionReceipt() {

    final java.util.function.Function<String, Event> eventFactory = name ->
            new Event(name, emptyList(), emptyList());

    final BiFunction<Integer, Event, Log> logFactory = (logIndex, event) ->
            new Log(false, "" + logIndex, "0", "0x0", "0x0", "0", "0x" + logIndex, "", "",
                    singletonList(EventEncoder.encode(event)));

    final Event testEvent1 = eventFactory.apply("TestEvent1");
    final Event testEvent2 = eventFactory.apply("TestEvent2");

    final List<Log> logs = Arrays.asList(
            logFactory.apply(0, testEvent1),
            logFactory.apply(1, testEvent2)
    );

    final TransactionReceipt transactionReceipt = new TransactionReceipt();
    transactionReceipt.setLogs(logs);

    final List<Contract.EventValuesWithLog> eventValuesWithLogs1 =
            contract.extractEventParametersWithLog(testEvent1, transactionReceipt);

    assertEquals(eventValuesWithLogs1.size(), 1);
    assertEquals(eventValuesWithLogs1.get(0).getLog(), logs.get(0));

    final List<Contract.EventValuesWithLog> eventValuesWithLogs2 =
            contract.extractEventParametersWithLog(testEvent2, transactionReceipt);

    assertEquals(eventValuesWithLogs2.size(), 1);
    assertEquals(eventValuesWithLogs2.get(0).getLog(), logs.get(1));
}
 

public static void observeContractEvent(Web3j web3j,
                                        String contractEventName,
                                        String contractAddress,
                                        List<TypeReference<?>> indexedParameters,
                                        List<TypeReference<?>> nonIndexedParameters,
                                        String eventReturnType,
                                        KieSession kieSession,
                                        String signalName,
                                        boolean doAbortOnUpdate,
                                        WorkItemManager workItemManager,
                                        WorkItem workItem) {

    Event event = new Event(contractEventName,
                            indexedParameters,
                            nonIndexedParameters);

    EthFilter filter = new EthFilter(DefaultBlockParameterName.EARLIEST,
                                     DefaultBlockParameterName.LATEST,
                                     contractAddress);

    filter.addSingleTopic(EventEncoder.encode(event));

    Class<Type> type = (Class<Type>) AbiTypes.getType(eventReturnType);
    TypeReference<Type> typeRef = TypeReference.create(type);

    web3j.ethLogObservable(filter).subscribe(
            eventTrigger -> {
                kieSession.signalEvent(signalName,
                                       FunctionReturnDecoder.decode(
                                               eventTrigger.getData(),
                                               Arrays.asList(typeRef)).get(0).getValue());
                if (doAbortOnUpdate) {
                    workItemManager.completeWorkItem(workItem.getId(),
                                                     null);
                }
            }
    );
}
 

MethodSpec buildDefaultEventFlowableFunction(String responseClassName, String functionName) {

        String generatedFunctionName = Strings.lowercaseFirstLetter(functionName) + "EventFlowable";
        ParameterizedTypeName parameterizedTypeName =
                ParameterizedTypeName.get(
                        ClassName.get(Flowable.class), ClassName.get("", responseClassName));

        MethodSpec.Builder flowableMethodBuilder =
                MethodSpec.methodBuilder(generatedFunctionName)
                        .addModifiers(Modifier.PUBLIC)
                        .addParameter(DefaultBlockParameter.class, START_BLOCK)
                        .addParameter(DefaultBlockParameter.class, END_BLOCK)
                        .returns(parameterizedTypeName);

        flowableMethodBuilder
                .addStatement(
                        "$1T filter = new $1T($2L, $3L, " + "getContractAddress())",
                        EthFilter.class,
                        START_BLOCK,
                        END_BLOCK)
                .addStatement(
                        "filter.addSingleTopic($T.encode("
                                + buildEventDefinitionName(functionName)
                                + "))",
                        EventEncoder.class)
                .addStatement("return " + generatedFunctionName + "(filter)");

        return flowableMethodBuilder.build();
    }
 

public static String getSignature(ContractEventSpecification spec) {

        final List<ParameterDefinition> allParameterDefinitions = new ArrayList<>();
        addAllDefinitions(allParameterDefinitions, spec.getIndexedParameterDefinitions());
        addAllDefinitions(allParameterDefinitions, spec.getNonIndexedParameterDefinitions());
        Collections.sort(allParameterDefinitions);

        final Event event = new Event(spec.getEventName(),
                getTypeReferencesFromParameterDefinitions(allParameterDefinitions));

        return EventEncoder.encode(event);
    }