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public void externalize(DataOutputStream out) throws IOException {
    out.writeUTF(name);
    if(value != null) {
        out.writeBoolean(true);
        out.writeUTF(value);
    } else {
        out.writeBoolean(false);
    }
    if(domain != null) {
        out.writeBoolean(true);

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public int getVersion();
public void externalize(DataOutputStream out) throws IOException;
public void internalize(int version, DataInputStream in) throws IOException;
public String getObjectId();

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Util.register("MyClass", MyClass.class);

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Map<String, Object> h = new HashMap<>();
h.put("Hi","World");
h.put("data", new byte[] {(byte)1});
Storage.getInstance().writeObject("Test", h);

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ConnectionRequest request = new ConnectionRequest(url, false);
request.setFailSilently(true);
NetworkManager.getInstance().addToQueueAndWait(request);
if(request.getResponseCode() != 200) {
    // probably an error...
}

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ConnectionRequest request = new ConnectionRequest(url, false) {
    protected void handleErrorResponseCode(int code, String message) {
        if(code == 444) {
            // do something
        }
    }
    protected void readResponse(InputStream input) {
        // just read from the response input stream
    }
};

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NetworkManager.getInstance().addToQueue(request);
NetworkManager.getInstance().addErrorListener((e) -> e.consume());

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ConnectionRequest request = new ConnectionRequest(url, false) {
    protected void readHeaders(Object connection) throws IOException {
        String[] headerNames = getHeaderFieldNames(connection);
        for(String headerName : headerNames) {
            String headerValue = getHeader(headerName);
            //....
        }
    }
    protected void readResponse(InputStream input) {
        // just read from the response input stream

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String authCode = user + ":" + password;
String authHeader = "Basic " + Base64.encode(authCode.getBytes());
NetworkManager.getInstance().addDefaultHeader("Authorization", authHeader);

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String authCode = user + ":" + password;
String authHeader = "Basic " + Base64.encode(authCode.getBytes());
request.addRequestHeader("Authorization", authHeader);