Java Event类代码示例

import org.web3j.abi.datatypes.Event; //导入依赖的package包/类
public Observable<MintedEventResponse> mintedEventObservable(DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
    final Event event = new Event("Minted", 
            Arrays.<TypeReference<?>>asList(),
            Arrays.<TypeReference<?>>asList(new TypeReference<Address>() {}, new TypeReference<Uint256>() {}));
    EthFilter filter = new EthFilter(startBlock, endBlock, getContractAddress());
    filter.addSingleTopic(EventEncoder.encode(event));
    return web3j.ethLogObservable(filter).map(new Func1<Log, MintedEventResponse>() {
        @Override
        public MintedEventResponse call(Log log) {
            EventValues eventValues = extractEventParameters(event, log);
            MintedEventResponse typedResponse = new MintedEventResponse();
            typedResponse._addr = (Address) eventValues.getNonIndexedValues().get(0);
            typedResponse.tokens = (Uint256) eventValues.getNonIndexedValues().get(1);
            return typedResponse;
        }
    });
}
 

import org.web3j.abi.datatypes.Event; //导入依赖的package包/类
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 = (Address) eventValues.getIndexedValues().get(0);
            typedResponse._to = (Address) eventValues.getIndexedValues().get(1);
            typedResponse._value = (Uint256) eventValues.getNonIndexedValues().get(0);
            return typedResponse;
        }
    });
}
 

import org.web3j.abi.datatypes.Event; //导入依赖的package包/类
public static EventValues extractEventParameters(Event event, Log log) throws Exception {
        Hashes topics = log.getTopics();
        if (topics == null || topics.size() == 0) {
//            throw new GethException("topic is empty");
            return null;
        }

        String eventSig = EventEncoder.encode(event);
        String topic = topics.get(0).getHex();
        if (!topic.equals(eventSig)) {
//            throw new GethException("topic is not match. topic signature : " + eventSig + ", log topic : " + topic);
            return null;
        }
        android.util.Log.d(TAG, "======= LOG DATA : " + byteToHex(log.getData()));

        List<Type> indexedValues = new ArrayList<>();
        List<Type> nonIndexedValues = FunctionReturnDecoder.decode(byteToHex(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).getHex(), indexedParameters.get(i));
            indexedValues.add(value);
        }
        return new EventValues(indexedValues, nonIndexedValues);
    }
 

import org.web3j.abi.datatypes.Event; //导入依赖的package包/类
public Observable<ApprovalEventResponse> approvalEventObservable(DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
    final Event event = new Event("Approval", 
            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, ApprovalEventResponse>() {
        @Override
        public ApprovalEventResponse call(Log log) {
            EventValues eventValues = extractEventParameters(event, log);
            ApprovalEventResponse typedResponse = new ApprovalEventResponse();
            typedResponse.owner = (Address) eventValues.getIndexedValues().get(0);
            typedResponse.spender = (Address) eventValues.getIndexedValues().get(1);
            typedResponse.value = (Uint256) eventValues.getNonIndexedValues().get(0);
            return typedResponse;
        }
    });
}
 

import org.web3j.abi.datatypes.Event; //导入依赖的package包/类
public Observable<VotedEventResponse> votedEventObservable(DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
    final Event event = new Event("Voted", 
            Arrays.<TypeReference<?>>asList(),
            Arrays.<TypeReference<?>>asList(new TypeReference<Address>() {}, new TypeReference<Bool>() {}, new TypeReference<Uint256>() {}));
    EthFilter filter = new EthFilter(startBlock, endBlock, getContractAddress());
    filter.addSingleTopic(EventEncoder.encode(event));
    return web3j.ethLogObservable(filter).map(new Func1<Log, VotedEventResponse>() {
        @Override
        public VotedEventResponse call(Log log) {
            EventValues eventValues = extractEventParameters(event, log);
            VotedEventResponse typedResponse = new VotedEventResponse();
            typedResponse._addr = (Address) eventValues.getNonIndexedValues().get(0);
            typedResponse.option = (Bool) eventValues.getNonIndexedValues().get(1);
            typedResponse.votes = (Uint256) eventValues.getNonIndexedValues().get(2);
            return typedResponse;
        }
    });
}
 

import org.web3j.abi.datatypes.Event; //导入依赖的package包/类
public Observable<PayoutEventResponse> payoutEventObservable(DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
    final Event event = new Event("Payout", 
            Arrays.<TypeReference<?>>asList(),
            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, PayoutEventResponse>() {
        @Override
        public PayoutEventResponse call(Log log) {
            EventValues eventValues = extractEventParameters(event, log);
            PayoutEventResponse typedResponse = new PayoutEventResponse();
            typedResponse.weiPerToken = (Uint256) eventValues.getNonIndexedValues().get(0);
            return typedResponse;
        }
    });
}
 

import org.web3j.abi.datatypes.Event; //导入依赖的package包/类
public Observable<ApprovalEventResponse> approvalEventObservable(DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
    final Event event = new Event("Approval", 
            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, ApprovalEventResponse>() {
        @Override
        public ApprovalEventResponse call(Log log) {
            EventValues eventValues = extractEventParameters(event, log);
            ApprovalEventResponse typedResponse = new ApprovalEventResponse();
            typedResponse._owner = (Address) eventValues.getIndexedValues().get(0);
            typedResponse._spender = (Address) eventValues.getIndexedValues().get(1);
            typedResponse._value = (Uint256) eventValues.getNonIndexedValues().get(0);
            return typedResponse;
        }
    });
}
 

import org.web3j.abi.datatypes.Event; //导入依赖的package包/类
public Observable<NewMessageEventResponse> newMessageEventObservable(DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
    final Event event = new Event("NewMessage", 
            Arrays.<TypeReference<?>>asList(),
            Arrays.<TypeReference<?>>asList(new TypeReference<Address>() {}, new TypeReference<Utf8String>() {}));
    EthFilter filter = new EthFilter(startBlock, endBlock, getContractAddress());
    filter.addSingleTopic(EventEncoder.encode(event));
    return web3j.ethLogObservable(filter).map(new Func1<Log, NewMessageEventResponse>() {
        @Override
        public NewMessageEventResponse call(Log log) {
            EventValues eventValues = extractEventParameters(event, log);
            NewMessageEventResponse typedResponse = new NewMessageEventResponse();
            typedResponse.from = (Address) eventValues.getNonIndexedValues().get(0);
            typedResponse.message = (Utf8String) eventValues.getNonIndexedValues().get(1);
            return typedResponse;
        }
    });
}
 

import org.web3j.abi.datatypes.Event; //导入依赖的package包/类
@OnClick(R.id.pending_event_set)
public void pendingEventSet() {
    final Event event = new Event(
            "Print",
            Collections.emptyList(),
            Collections.singletonList(new TypeReference<Uint256>() {
            }));

    FilterManager.Filter filter = new FilterManager.Filter(event, HELLO_CONTRACT_ADDR);
    FilterManager.pendingFilterLogs(filter)
            .compose(bindToLifecycle())
            .map(log -> Utils.extractEventParameters(event, log))
            .subscribe(eventValues -> {
                Log.i(TAG, "output : " + eventValues.getNonIndexedValues().get(0).getValue());
            }, Throwable::printStackTrace);
}
 

import org.web3j.abi.datatypes.Event; //导入依赖的package包/类
public static boolean isTopicMatch(Event event, Log log) throws Exception {
    Hashes topics = log.getTopics();
    if (topics == null || topics.size() == 0) {
        android.util.Log.e(TAG, "topic is empty");
        return false;
    }

    String eventSig = EventEncoder.encode(event);
    String topic = topics.get(0).getHex();
    if (!topic.equals(eventSig)) {
        android.util.Log.e(TAG, "topic is not match. topic signature : " + eventSig + ", log topic : " + topic);
        return false;
    }

    return true;
}
 

import org.web3j.abi.datatypes.Event; //导入依赖的package包/类
public List<NotifyEventResponse> getNotifyEvents(Receipt transactionReceipt) throws Exception {
    final Event event = new Event(
            "Notify",
            Collections.emptyList(),
            Arrays.asList(
                    new TypeReference<Uint256>() {
                    },
                    new TypeReference<Uint256>() {
                    }
            ));

    List<EventValues> valueList = extractEventParameters(event, transactionReceipt);
    ArrayList<NotifyEventResponse> responses = new ArrayList<>(valueList.size());
    for (EventValues eventValues : valueList) {
        NotifyEventResponse typedResponse = new NotifyEventResponse();
        typedResponse.input = (Uint256) eventValues.getNonIndexedValues().get(0);
        typedResponse.result = (Uint256) eventValues.getNonIndexedValues().get(1);
        responses.add(typedResponse);
    }
    return responses;
}
 

import org.web3j.abi.datatypes.Event; //导入依赖的package包/类
public Observable<NotifyEventResponse> notifyEventObservable() {
    final Event event = new Event(
            "Notify",
            Collections.emptyList(),
            Arrays.asList(
                    new TypeReference<Uint256>() {
                    },
                    new TypeReference<Uint256>() {
                    }
            ));

    return filterLogs(event)
            .map(eventValues -> {
                NotifyEventResponse typedResponse = new NotifyEventResponse();
                typedResponse.input = (Uint256) eventValues.getNonIndexedValues().get(0);
                typedResponse.result = (Uint256) eventValues.getNonIndexedValues().get(1);
                return typedResponse;
            });
}
 

import org.web3j.abi.datatypes.Event; //导入依赖的package包/类
public List<PrintEventResponse> getPrintEvents(Receipt transactionReceipt) throws Exception {
    final Event event = new Event(
            "Print",
            Collections.emptyList(),
            Collections.singletonList(new TypeReference<Uint256>() {
            }));

    List<EventValues> valueList = extractEventParameters(event, transactionReceipt);
    ArrayList<PrintEventResponse> responses = new ArrayList<>(valueList.size());
    for (EventValues eventValues : valueList) {
        PrintEventResponse printEventResponse = new PrintEventResponse();
        printEventResponse.out = (Uint256) eventValues.getNonIndexedValues().get(0);
        responses.add(printEventResponse);
    }
    return responses;
}
 

import org.web3j.abi.datatypes.Event; //导入依赖的package包/类
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;
        }
    });
}
 

import org.web3j.abi.datatypes.Event; //导入依赖的package包/类
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 = (Address) eventValues.getIndexedValues().get(0);
            typedResponse.to = (Address) eventValues.getIndexedValues().get(1);
            typedResponse.value = (Uint256) eventValues.getNonIndexedValues().get(0);
            return typedResponse;
        }
    });
}