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Added some information (and comments) in HAM CRDT class
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@ -7,35 +7,36 @@ import org.json.JSONObject;
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import java.util.Map;
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public class HAM {
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private static long defer = Long.MAX_VALUE;
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static class HAMResult {
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public boolean defer = false;
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public boolean historical = false;
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public boolean converge = false;
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public boolean incoming = false;
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public boolean current = false;
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public boolean defer = false; // Defer means that the current state is greater than our computer time, and should only be processed when our computer time reaches this state
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public boolean historical = false; // Historical means the old state. This is usually ignored.
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public boolean converge = false; // Everything is fine, you can do merge
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public boolean incoming = false; // Leave incoming value
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public boolean current = false; // Leave current value
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public boolean state = false;
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public String err = null;
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}
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public static HAMResult ham(long machineState, long incomingState, long currentState, Object incomingValue, Object currentValue) {
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HAMResult result = new HAMResult();
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if(machineState < incomingState) {
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// the incoming value is outside the boundary of the machine's state, it must be reprocessed in another state.
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result.defer = true;
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return result;
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}
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if(incomingState < currentState){
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if(incomingState < currentState) {
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// the incoming value is within the boundary of the machine's state, but not within the range.
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result.historical = true;
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return result;
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}
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if(currentState < incomingState) {
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// the incoming value is within both the boundary and the range of the machine's state.
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result.converge = true;
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result.incoming = true;
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return result;
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}
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if(incomingState == currentState) {
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// if incoming state and current state is the same
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if(incomingValue.equals(currentValue)) {
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result.state = true;
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return result;
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@ -51,8 +52,7 @@ public class HAM {
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return result;
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}
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}
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result.err = "Invalid CRDT Data: "+ incomingValue +" to "+ currentValue +" at "+ incomingState +" to "+ currentState +"!";
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return result;
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throw new IllegalArgumentException("Invalid CRDT Data: "+ incomingValue +" to "+ currentValue +" at "+ incomingState +" to "+ currentState +"!");
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}
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public static InMemoryGraph mix(InMemoryGraph change, StorageBackend data) {
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