Compare Exchange: How to Put Compare Exchange Value

Method:

public PutCompareExchangeValueOperation(String key, T value, long index)

Returned object:

public class CompareExchangeResult<T> {
    private T value;
    private long index;
    private boolean successful;

    public T getValue() {
        return value;
    }

    public void setValue(T value) {
        this.value = value;
    }

    public long getIndex() {
        return index;
    }

    public void setIndex(long index) {
        this.index = index;
    }

    public boolean isSuccessful() {
        return successful;
    }

    public void setSuccessful(boolean successful) {
        this.successful = successful;
    }
}

CompareExchangeResult<String> compareExchangeResult = store.operations().send(
    new PutCompareExchangeValueOperation<>("Emails/foo@example.org", "users/123", 0));

boolean successful = compareExchangeResult.isSuccessful();
// If successful is true: then Key 'foo@example.org' now has the value of "users/123"

// Get existing value
CompareExchangeValue<User> readResult
    = store.operations().send(
        new GetCompareExchangeValueOperation<>(User.class, "AdminUser"));

readResult.getValue().setAge(readResult.getValue().getAge() + 1);

// Update value
CompareExchangeResult<User> saveResult
    = store.operations().send(
        new PutCompareExchangeValueOperation<>("AdminUser", readResult.getValue(), readResult.getIndex()));

// The save result is successful only if 'index' wasn't changed between the read and write operations
boolean saveResultSuccessful = saveResult.isSuccessful();