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author | Zhomart Mukhamejanov <zhomart@google.com> | 2018-05-30 03:36:36 +0200 |
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committer | Gerrit Code Review <noreply-gerritcodereview@google.com> | 2018-05-30 03:36:36 +0200 |
commit | 721f6d851f5b22d9b65fd99df69136164b5684e0 (patch) | |
tree | cc837b5c2fc420c16ae96e1997613c91a8d30c28 /updater_sample/src/com/example/android/systemupdatersample/UpdaterState.java | |
parent | Merge "updater_sample: add UpdateData" (diff) | |
parent | updater_sample: add UpdaterState (diff) | |
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Diffstat (limited to 'updater_sample/src/com/example/android/systemupdatersample/UpdaterState.java')
-rw-r--r-- | updater_sample/src/com/example/android/systemupdatersample/UpdaterState.java | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/updater_sample/src/com/example/android/systemupdatersample/UpdaterState.java b/updater_sample/src/com/example/android/systemupdatersample/UpdaterState.java new file mode 100644 index 000000000..36a90982e --- /dev/null +++ b/updater_sample/src/com/example/android/systemupdatersample/UpdaterState.java @@ -0,0 +1,103 @@ +/* + * Copyright (C) 2018 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package com.example.android.systemupdatersample; + +import android.util.SparseArray; + +import com.google.common.collect.ImmutableMap; +import com.google.common.collect.ImmutableSet; + +import java.util.concurrent.atomic.AtomicInteger; + +/** + * Controls updater state. + */ +public class UpdaterState { + + public static final int IDLE = 0; + public static final int ERROR = 1; + public static final int RUNNING = 2; + public static final int PAUSED = 3; + public static final int SLOT_SWITCH_REQUIRED = 4; + public static final int REBOOT_REQUIRED = 5; + + private static final SparseArray<String> STATE_MAP = new SparseArray<>(); + + static { + STATE_MAP.put(0, "IDLE"); + STATE_MAP.put(1, "ERROR"); + STATE_MAP.put(2, "RUNNING"); + STATE_MAP.put(3, "PAUSED"); + STATE_MAP.put(4, "SLOT_SWITCH_REQUIRED"); + STATE_MAP.put(5, "REBOOT_REQUIRED"); + } + + /** + * Allowed state transitions. It's a map: key is a state, value is a set of states that + * are allowed to transition to from key. + */ + private static final ImmutableMap<Integer, ImmutableSet<Integer>> TRANSITIONS = + ImmutableMap.of( + IDLE, ImmutableSet.of(RUNNING), + RUNNING, ImmutableSet.of(ERROR, PAUSED, REBOOT_REQUIRED, SLOT_SWITCH_REQUIRED), + PAUSED, ImmutableSet.of(RUNNING), + SLOT_SWITCH_REQUIRED, ImmutableSet.of(ERROR) + ); + + private AtomicInteger mState; + + public UpdaterState(int state) { + this.mState = new AtomicInteger(state); + } + + /** + * Returns updater state. + */ + public int get() { + return mState.get(); + } + + /** + * Sets the updater state. + * + * @throws InvalidTransitionException if transition is not allowed. + */ + public void set(int newState) throws InvalidTransitionException { + int oldState = mState.get(); + if (!TRANSITIONS.get(oldState).contains(newState)) { + throw new InvalidTransitionException( + "Can't transition from " + oldState + " to " + newState); + } + mState.set(newState); + } + + /** + * Converts status code to status name. + */ + public static String getStateText(int state) { + return STATE_MAP.get(state); + } + + /** + * Defines invalid state transition exception. + */ + public static class InvalidTransitionException extends Exception { + public InvalidTransitionException(String msg) { + super(msg); + } + } +} |