Yu-Han Yang | 3557cc7 | 2018-03-21 12:48:36 -0700 | [diff] [blame] | 1 | package com.android.server.location; |
| 2 | |
| 3 | import android.util.Log; |
| 4 | |
| 5 | import com.android.internal.annotations.VisibleForTesting; |
| 6 | |
| 7 | /** |
| 8 | * Manages GNSS Batching operations. |
| 9 | * |
| 10 | * <p>This class is not thread safe (It's client's responsibility to make sure calls happen on |
| 11 | * the same thread). |
| 12 | */ |
| 13 | public class GnssBatchingProvider { |
| 14 | |
| 15 | private static final String TAG = "GnssBatchingProvider"; |
| 16 | private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG); |
| 17 | |
| 18 | private final GnssBatchingProviderNative mNative; |
| 19 | private boolean mEnabled; |
| 20 | private boolean mStarted; |
| 21 | private long mPeriodNanos; |
| 22 | private boolean mWakeOnFifoFull; |
| 23 | |
| 24 | GnssBatchingProvider() { |
| 25 | this(new GnssBatchingProviderNative()); |
| 26 | } |
| 27 | |
| 28 | @VisibleForTesting |
| 29 | GnssBatchingProvider(GnssBatchingProviderNative gnssBatchingProviderNative) { |
| 30 | mNative = gnssBatchingProviderNative; |
| 31 | } |
| 32 | |
| 33 | /** |
| 34 | * Returns the GNSS batching size |
| 35 | */ |
| 36 | public int getBatchSize() { |
| 37 | return mNative.getBatchSize(); |
| 38 | } |
| 39 | |
| 40 | /** Enable GNSS batching. */ |
| 41 | public void enable() { |
| 42 | mEnabled = mNative.initBatching(); |
| 43 | if (!mEnabled) { |
| 44 | Log.e(TAG, "Failed to initialize GNSS batching"); |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * Starts the hardware batching operation |
| 50 | */ |
| 51 | public boolean start(long periodNanos, boolean wakeOnFifoFull) { |
| 52 | if (!mEnabled) { |
| 53 | throw new IllegalStateException(); |
| 54 | } |
| 55 | if (periodNanos <= 0) { |
| 56 | Log.e(TAG, "Invalid periodNanos " + periodNanos + |
| 57 | " in batching request, not started"); |
| 58 | return false; |
| 59 | } |
| 60 | mStarted = mNative.startBatch(periodNanos, wakeOnFifoFull); |
| 61 | if (mStarted) { |
| 62 | mPeriodNanos = periodNanos; |
| 63 | mWakeOnFifoFull = wakeOnFifoFull; |
| 64 | } |
| 65 | return mStarted; |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Forces a flush of existing locations from the hardware batching |
| 70 | */ |
| 71 | public void flush() { |
| 72 | if (!mStarted) { |
| 73 | Log.w(TAG, "Cannot flush since GNSS batching has not started."); |
| 74 | return; |
| 75 | } |
| 76 | mNative.flushBatch(); |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * Stops the batching operation |
| 81 | */ |
| 82 | public boolean stop() { |
| 83 | boolean stopped = mNative.stopBatch(); |
| 84 | if (stopped) { |
| 85 | mStarted = false; |
| 86 | } |
| 87 | return stopped; |
| 88 | } |
| 89 | |
| 90 | /** Disable GNSS batching. */ |
| 91 | public void disable() { |
| 92 | stop(); |
| 93 | mNative.cleanupBatching(); |
| 94 | mEnabled = false; |
| 95 | } |
| 96 | |
| 97 | // TODO(b/37460011): Use this with death recovery logic. |
| 98 | void resumeIfStarted() { |
| 99 | if (DEBUG) { |
| 100 | Log.d(TAG, "resumeIfStarted"); |
| 101 | } |
| 102 | if (mStarted) { |
| 103 | mNative.startBatch(mPeriodNanos, mWakeOnFifoFull); |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | @VisibleForTesting |
| 108 | static class GnssBatchingProviderNative { |
| 109 | public int getBatchSize() { |
| 110 | return native_get_batch_size(); |
| 111 | } |
| 112 | |
| 113 | public boolean startBatch(long periodNanos, boolean wakeOnFifoFull) { |
| 114 | return native_start_batch(periodNanos, wakeOnFifoFull); |
| 115 | } |
| 116 | |
| 117 | public void flushBatch() { |
| 118 | native_flush_batch(); |
| 119 | } |
| 120 | |
| 121 | public boolean stopBatch() { |
| 122 | return native_stop_batch(); |
| 123 | } |
| 124 | |
| 125 | public boolean initBatching() { |
| 126 | return native_init_batching(); |
| 127 | } |
| 128 | |
| 129 | public void cleanupBatching() { |
| 130 | native_cleanup_batching(); |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | private static native int native_get_batch_size(); |
| 135 | |
| 136 | private static native boolean native_start_batch(long periodNanos, boolean wakeOnFifoFull); |
| 137 | |
| 138 | private static native void native_flush_batch(); |
| 139 | |
| 140 | private static native boolean native_stop_batch(); |
| 141 | |
| 142 | private static native boolean native_init_batching(); |
| 143 | |
| 144 | private static native void native_cleanup_batching(); |
| 145 | } |