Device Management: centralized DeviceType resolution cache

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/discovery/DiscoveryActivityV2.java

@@ -587,7 +587,9 @@ public class DiscoveryActivityV2 extends AbstractGBActivity implements AdapterVi
             return;
         }
 
-        if (!deviceCandidate.getDeviceType().isSupported()) {
+        DeviceType deviceType = DeviceHelper.getInstance().resolveDeviceType(deviceCandidate);
+
+        if (!deviceType.isSupported()) {
             LOG.warn("Unsupported device candidate {}", deviceCandidate);
             copyDetailsToClipboard(deviceCandidate);
             return;
@@ -595,7 +597,7 @@ public class DiscoveryActivityV2 extends AbstractGBActivity implements AdapterVi
 
         stopDiscovery();
 
-        final DeviceCoordinator coordinator = DeviceHelper.getInstance().resolveCoordinator(deviceCandidate);
+        final DeviceCoordinator coordinator = deviceType.getDeviceCoordinator();
         LOG.info("Using device candidate {} with coordinator {}", deviceCandidate, coordinator.getClass());
 
         if (coordinator.getBondingStyle() == DeviceCoordinator.BONDING_STYLE_REQUIRE_KEY) {
@@ -661,12 +663,14 @@ public class DiscoveryActivityV2 extends AbstractGBActivity implements AdapterVi
             return true;
         }
 
-        if (!deviceCandidate.getDeviceType().isSupported()) {
+        DeviceType deviceType = DeviceHelper.getInstance().resolveDeviceType(deviceCandidate);
+
+        if (!deviceType.isSupported()) {
             showUnsupportedDeviceDialog(deviceCandidate);
             return true;
         }
 
-        final DeviceCoordinator coordinator = deviceCandidate.getDeviceType().getDeviceCoordinator();
+        final DeviceCoordinator coordinator = deviceType.getDeviceCoordinator();
         final GBDevice device = DeviceHelper.getInstance().toSupportedDevice(deviceCandidate);
         if (coordinator.getSupportedDeviceSpecificSettings(device) == null) {
             return true;

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/discovery/GBScanEventProcessor.java

@@ -184,10 +184,9 @@ public final class GBScanEventProcessor implements Runnable {
             }
         }
 
-        final DeviceType deviceType = DeviceHelper.getInstance().resolveDeviceType(candidate);
+        final DeviceType deviceType = DeviceHelper.getInstance().resolveDeviceType(candidate, false);
 
         if (deviceType.isSupported() || discoverUnsupported) {
-            candidate.setDeviceType(deviceType);
             synchronized (candidatesByAddress) {
                 candidatesByAddress.put(candidate.getMacAddress(), candidate);
             }
@@ -263,7 +262,7 @@ public final class GBScanEventProcessor implements Runnable {
                     "Device {} ({}) is supported as '{}' without scanning services",
                     candidate.getDevice(),
                     candidate.getName(),
-                    candidate.getDeviceType()
+                    DeviceHelper.getInstance().resolveDeviceType(candidate, false)
             );
             return true;
         }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/adapter/DeviceCandidateAdapter.java

@@ -34,6 +34,7 @@ import nodomain.freeyourgadget.gadgetbridge.R;
 import nodomain.freeyourgadget.gadgetbridge.devices.DeviceCoordinator;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDeviceCandidate;
+import nodomain.freeyourgadget.gadgetbridge.model.DeviceType;
 import nodomain.freeyourgadget.gadgetbridge.util.DeviceHelper;
 import nodomain.freeyourgadget.gadgetbridge.util.GB;
 
@@ -62,7 +63,9 @@ public class DeviceCandidateAdapter extends ArrayAdapter<GBDeviceCandidate> {
         TextView deviceAddressLabel = view.findViewById(R.id.item_details);
         TextView deviceStatus = view.findViewById(R.id.item_status);
 
-        DeviceCoordinator coordinator = device.getDeviceType().getDeviceCoordinator();
+        DeviceType deviceType = DeviceHelper.getInstance().resolveDeviceType(device);
+
+        DeviceCoordinator coordinator = deviceType.getDeviceCoordinator();
 
         String name = formatDeviceCandidate(device);
         deviceNameLabel.setText(name);
@@ -77,7 +80,7 @@ public class DeviceCandidateAdapter extends ArrayAdapter<GBDeviceCandidate> {
             }
         }
 
-        if (!device.getDeviceType().isSupported()) {
+        if (!deviceType.isSupported()) {
             statusLines.add(getContext().getString(R.string.device_unsupported));
         }
 

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/impl/GBDeviceCandidate.java

@@ -37,6 +37,7 @@ import nodomain.freeyourgadget.gadgetbridge.GBApplication;
 import nodomain.freeyourgadget.gadgetbridge.R;
 import nodomain.freeyourgadget.gadgetbridge.model.DeviceType;
 import nodomain.freeyourgadget.gadgetbridge.util.AndroidUtils;
+import nodomain.freeyourgadget.gadgetbridge.util.DeviceHelper;
 
 /**
  * A device candidate is a Bluetooth device that is not yet managed by
@@ -49,8 +50,6 @@ public class GBDeviceCandidate implements Parcelable, Cloneable {
     private BluetoothDevice device;
     private short rssi;
     private ParcelUuid[] serviceUuids;
-    private DeviceType deviceType = DeviceType.UNKNOWN;
-
     // Cached values for device name and bond status, to avoid querying the remote bt device
     private String deviceName;
     private Boolean isBonded = null;
@@ -67,7 +66,6 @@ public class GBDeviceCandidate implements Parcelable, Cloneable {
             throw new IllegalStateException("Unable to read state from Parcel");
         }
         rssi = (short) in.readInt();
-        deviceType = DeviceType.valueOf(in.readString());
 
         serviceUuids = AndroidUtils.toParcelUuids(in.readParcelableArray(getClass().getClassLoader()));
 
@@ -82,7 +80,6 @@ public class GBDeviceCandidate implements Parcelable, Cloneable {
     public void writeToParcel(Parcel dest, int flags) {
         dest.writeParcelable(device, 0);
         dest.writeInt(rssi);
-        dest.writeString(deviceType.name());
         dest.writeParcelableArray(serviceUuids, 0);
         dest.writeString(deviceName);
         if (isBonded == null) {
@@ -108,14 +105,6 @@ public class GBDeviceCandidate implements Parcelable, Cloneable {
         return device;
     }
 
-    public void setDeviceType(DeviceType type) {
-        deviceType = type;
-    }
-
-    public DeviceType getDeviceType() {
-        return deviceType;
-    }
-
     public String getMacAddress() {
         return device != null ? device.getAddress() : GBApplication.getContext().getString(R.string._unknown_);
     }
@@ -238,7 +227,7 @@ public class GBDeviceCandidate implements Parcelable, Cloneable {
 
     @Override
     public String toString() {
-        return getName() + ": " + getMacAddress() + " (" + getDeviceType() + ")";
+        return getName() + ": " + getMacAddress();
     }
 
     @NonNull
@@ -249,7 +238,6 @@ public class GBDeviceCandidate implements Parcelable, Cloneable {
             clone.device = this.device;
             clone.rssi = this.rssi;
             clone.serviceUuids = this.serviceUuids;
-            clone.deviceType = this.deviceType;
             clone.deviceName = this.deviceName;
             clone.isBonded = this.isBonded;
             return clone;

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/DeviceHelper.java

@@ -34,6 +34,7 @@ import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Set;
@@ -63,6 +64,8 @@ public class DeviceHelper {
         return instance;
     }
 
+    private final HashMap<String, DeviceType> deviceTypeCache = new HashMap<>();
+
     public GBDevice findAvailableDevice(String deviceAddress, Context context) {
         Set<GBDevice> availableDevices = getAvailableDevices(context);
         for (GBDevice availableDevice : availableDevices) {
@@ -130,14 +133,27 @@ public class DeviceHelper {
 
         return orderedDeviceTypes;
     }
-
     public DeviceType resolveDeviceType(GBDeviceCandidate deviceCandidate) {
+        return resolveDeviceType(deviceCandidate, true);
+    }
+
+    public DeviceType resolveDeviceType(GBDeviceCandidate deviceCandidate, boolean useCache){
         synchronized (this) {
+            if(useCache) {
+                DeviceType cachedType =
+                        deviceTypeCache.get(deviceCandidate.getMacAddress().toLowerCase());
+                if (cachedType != null) {
+                    return cachedType;
+                }
+            }
+
             for (DeviceType type : getOrderedDeviceTypes()) {
                 if (type.getDeviceCoordinator().supports(deviceCandidate)) {
+                    deviceTypeCache.put(deviceCandidate.getMacAddress().toLowerCase(), type);
                     return type;
                 }
             }
+            deviceTypeCache.put(deviceCandidate.getMacAddress().toLowerCase(), DeviceType.UNKNOWN);
         }
         return DeviceType.UNKNOWN;
     }