85 lines
2.9 KiB
Java
85 lines
2.9 KiB
Java
package com.eveningoutpost.dexdrip.G5Model;
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// jamorham
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import com.eveningoutpost.dexdrip.Models.JoH;
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import com.eveningoutpost.dexdrip.Models.UserError;
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import com.eveningoutpost.dexdrip.UtilityModels.Constants;
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import com.eveningoutpost.dexdrip.UtilityModels.PersistentStore;
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import static com.eveningoutpost.dexdrip.UtilityModels.BgGraphBuilder.DEXCOM_PERIOD;
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public class DexSyncKeeper {
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private static final String TAG = DexTimeKeeper.class.getSimpleName();
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private static final String DEX_SYNC_STORE = "DEX_SYNC_STORE-";
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private static final long OLDEST_POSSIBLE = 1533839836123L;
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private static final long GRACE_TIME = 5000;
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private static final long VALIDITY_PERIOD = Constants.DAY_IN_MS;
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// store sync time as now
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public static void store(final String transmitterId) {
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store(transmitterId, JoH.tsl());
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}
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// store sync time
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public static void store(final String transmitterId, final long when) {
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if ((transmitterId == null) || (transmitterId.length() != 6)) {
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UserError.Log.e(TAG, "Invalid dex transmitter in store: " + transmitterId);
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return;
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}
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if (when < OLDEST_POSSIBLE) {
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UserError.Log.wtf(TAG, "Invalid timestamp to store: " + JoH.dateTimeText(when));
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return;
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}
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PersistentStore.setLong(DEX_SYNC_STORE + transmitterId, when);
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UserError.Log.d(TAG, "Sync time updated to: " + JoH.dateTimeText(when));
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}
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// anticpiate next wake up from now
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public static long anticipate(final String transmitterId) {
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return anticipate(transmitterId, JoH.tsl());
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}
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// anticipate next wake up from time
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// -1 means we don't know anything
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static long anticipate(final String transmitterId, final long now) {
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final long last = PersistentStore.getLong(DEX_SYNC_STORE + transmitterId);
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if (last < OLDEST_POSSIBLE) {
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return -1;
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}
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if (last > now) {
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UserError.Log.e(TAG, "Anticipation time in the future! cannot use: " + JoH.dateTimeText(last));
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return -1; // can't be in the future
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}
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if (now - last > VALIDITY_PERIOD) {
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UserError.Log.e(TAG, "Anticipation time too old to use: " + JoH.dateTimeText(last));
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return -1;
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}
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final long modulo = (now - last) % DEXCOM_PERIOD;
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if ((modulo < GRACE_TIME) && ((now - last) > GRACE_TIME)) return now;
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final long next = now + (DEXCOM_PERIOD - modulo);
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return next;
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}
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public static boolean isReady(final String transmitterId) {
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return anticipate(transmitterId, JoH.tsl()) != -1;
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}
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// are we outside connection window?
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// TODO also handle waking up before window PRE_GRACE_TIME = 20seconds?
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public static boolean outsideWindow(final String transmitterId) {
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final long now = JoH.tsl();
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final long next = anticipate(transmitterId, now);
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return next != now;
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}
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}
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