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/*
 * Copyright (C) 2013 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.android.internal.app.procstats;


import android.os.Parcel;
import android.os.SystemClock;
import android.service.procstats.PackageServiceOperationStatsProto;
import android.service.procstats.PackageServiceStatsProto;
import android.service.procstats.ProcessStatsEnums;
import android.util.Slog;
import android.util.TimeUtils;
import android.util.proto.ProtoOutputStream;

import static com.android.internal.app.procstats.ProcessStats.STATE_NOTHING;

import java.io.PrintWriter;

public final class ServiceState {
    private static final String TAG = "ProcessStats";
    private static final boolean DEBUG = false;

    public static final int SERVICE_RUN = 0;
    public static final int SERVICE_STARTED = 1;
    public static final int SERVICE_BOUND = 2;
    public static final int SERVICE_EXEC = 3;
    public static final int SERVICE_FOREGROUND = 4;
    public static final int SERVICE_COUNT = 5;

    private final String mPackage;
    private final String mProcessName;
    private final String mName;
    private final DurationsTable mDurations;

    private ProcessState mProc;
    private Object mOwner;

    private int mRunCount;
    private int mRunState = STATE_NOTHING;
    private long mRunStartTime;

    private boolean mStarted;
    private boolean mRestarting;
    private int mStartedCount;
    private int mStartedState = STATE_NOTHING;
    private long mStartedStartTime;

    private int mBoundCount;
    private int mBoundState = STATE_NOTHING;
    private long mBoundStartTime;

    private int mExecCount;
    private int mExecState = STATE_NOTHING;
    private long mExecStartTime;

    private int mForegroundCount;
    private int mForegroundState = STATE_NOTHING;
    private long mForegroundStartTime;

    public ServiceState(ProcessStats processStats, String pkg, String name,
            String processName, ProcessState proc) {
        mPackage = pkg;
        mName = name;
        mProcessName = processName;
        mProc = proc;
        mDurations = new DurationsTable(processStats.mTableData);
    }

    public String getPackage() {
        return mPackage;
    }
    
    public String getProcessName() {
        return mProcessName;
    }

    public String getName() {
        return mName;
    }

    public ProcessState getProcess() {
        return mProc;
    }

    public void setProcess(ProcessState proc) {
        mProc = proc;
    }

    public void setMemFactor(int memFactor, long now) {
        if (isRestarting()) {
            setRestarting(true, memFactor, now);
        } else if (isInUse()) {
            if (mStartedState != ProcessStats.STATE_NOTHING) {
                setStarted(true, memFactor, now);
            }
            if (mBoundState != ProcessStats.STATE_NOTHING) {
                setBound(true, memFactor, now);
            }
            if (mExecState != ProcessStats.STATE_NOTHING) {
                setExecuting(true, memFactor, now);
            }
            if (mForegroundState != ProcessStats.STATE_NOTHING) {
                setForeground(true, memFactor, now);
            }
        }
    }

    public void applyNewOwner(Object newOwner) {
        if (mOwner != newOwner) {
            if (mOwner == null) {
                mOwner = newOwner;
                mProc.incActiveServices(mName);
            } else {
                // There was already an old owner, reset this object for its
                // new owner.
                mOwner = newOwner;
                if (mStarted || mBoundState != STATE_NOTHING || mExecState != STATE_NOTHING
                        || mForegroundState != STATE_NOTHING) {
                    long now = SystemClock.uptimeMillis();
                    if (mStarted) {
                        if (DEBUG) Slog.d(TAG, "Service has new owner " + newOwner
                                + " from " + mOwner + " while started: pkg="
                                + mPackage + " service=" + mName + " proc=" + mProc);
                        setStarted(false, 0, now);
                    }
                    if (mBoundState != STATE_NOTHING) {
                        if (DEBUG) Slog.d(TAG, "Service has new owner " + newOwner
                                + " from " + mOwner + " while bound: pkg="
                                + mPackage + " service=" + mName + " proc=" + mProc);
                        setBound(false, 0, now);
                    }
                    if (mExecState != STATE_NOTHING) {
                        if (DEBUG) Slog.d(TAG, "Service has new owner " + newOwner
                                + " from " + mOwner + " while executing: pkg="
                                + mPackage + " service=" + mName + " proc=" + mProc);
                        setExecuting(false, 0, now);
                    }
                    if (mForegroundState != STATE_NOTHING) {
                        if (DEBUG) Slog.d(TAG, "Service has new owner " + newOwner
                                + " from " + mOwner + " while foreground: pkg="
                                + mPackage + " service=" + mName + " proc=" + mProc);
                        setForeground(false, 0, now);
                    }
                }
            }
        }
    }

    public void clearCurrentOwner(Object owner, boolean silently) {
        if (mOwner == owner) {
            mProc.decActiveServices(mName);
            if (mStarted || mBoundState != STATE_NOTHING || mExecState != STATE_NOTHING
                    || mForegroundState != STATE_NOTHING) {
                long now = SystemClock.uptimeMillis();
                if (mStarted) {
                    if (!silently) {
                        Slog.wtfStack(TAG, "Service owner " + owner
                                + " cleared while started: pkg=" + mPackage + " service="
                                + mName + " proc=" + mProc);
                    }
                    setStarted(false, 0, now);
                }
                if (mBoundState != STATE_NOTHING) {
                    if (!silently) {
                        Slog.wtfStack(TAG, "Service owner " + owner
                                + " cleared while bound: pkg=" + mPackage + " service="
                                + mName + " proc=" + mProc);
                    }
                    setBound(false, 0, now);
                }
                if (mExecState != STATE_NOTHING) {
                    if (!silently) {
                        Slog.wtfStack(TAG, "Service owner " + owner
                                + " cleared while exec: pkg=" + mPackage + " service="
                                + mName + " proc=" + mProc);
                    }
                    setExecuting(false, 0, now);
                }
                if (mForegroundState != STATE_NOTHING) {
                    if (!silently) {
                        Slog.wtfStack(TAG, "Service owner " + owner
                                + " cleared while foreground: pkg=" + mPackage + " service="
                                + mName + " proc=" + mProc);
                    }
                    setForeground(false, 0, now);
                }
            }
            mOwner = null;
        }
    }

    public boolean isInUse() {
        return mOwner != null || mRestarting;
    }

    public boolean isRestarting() {
        return mRestarting;
    }

    public void add(ServiceState other) {
        mDurations.addDurations(other.mDurations);
        mRunCount += other.mRunCount;
        mStartedCount += other.mStartedCount;
        mBoundCount += other.mBoundCount;
        mExecCount += other.mExecCount;
        mForegroundCount += other.mForegroundCount;
    }

    public void resetSafely(long now) {
        mDurations.resetTable();
        mRunCount = mRunState != STATE_NOTHING ? 1 : 0;
        mStartedCount = mStartedState != STATE_NOTHING ? 1 : 0;
        mBoundCount = mBoundState != STATE_NOTHING ? 1 : 0;
        mExecCount = mExecState != STATE_NOTHING ? 1 : 0;
        mForegroundCount = mForegroundState != STATE_NOTHING ? 1 : 0;
        mRunStartTime = mStartedStartTime = mBoundStartTime = mExecStartTime =
                mForegroundStartTime = now;
    }

    public void writeToParcel(Parcel out, long now) {
        mDurations.writeToParcel(out);
        out.writeInt(mRunCount);
        out.writeInt(mStartedCount);
        out.writeInt(mBoundCount);
        out.writeInt(mExecCount);
        out.writeInt(mForegroundCount);
    }

    public boolean readFromParcel(Parcel in) {
        if (!mDurations.readFromParcel(in)) {
            return false;
        }
        mRunCount = in.readInt();
        mStartedCount = in.readInt();
        mBoundCount = in.readInt();
        mExecCount = in.readInt();
        mForegroundCount = in.readInt();
        return true;
    }

    public void commitStateTime(long now) {
        if (mRunState != STATE_NOTHING) {
            mDurations.addDuration(SERVICE_RUN + (mRunState*SERVICE_COUNT),
                    now - mRunStartTime);
            mRunStartTime = now;
        }
        if (mStartedState != STATE_NOTHING) {
            mDurations.addDuration(SERVICE_STARTED + (mStartedState*SERVICE_COUNT),
                    now - mStartedStartTime);
            mStartedStartTime = now;
        }
        if (mBoundState != STATE_NOTHING) {
            mDurations.addDuration(SERVICE_BOUND + (mBoundState*SERVICE_COUNT),
                    now - mBoundStartTime);
            mBoundStartTime = now;
        }
        if (mExecState != STATE_NOTHING) {
            mDurations.addDuration(SERVICE_EXEC + (mExecState*SERVICE_COUNT),
                    now - mExecStartTime);
            mExecStartTime = now;
        }
        if (mForegroundState != STATE_NOTHING) {
            mDurations.addDuration(SERVICE_FOREGROUND + (mForegroundState*SERVICE_COUNT),
                    now - mForegroundStartTime);
            mForegroundStartTime = now;
        }
    }

    private void updateRunning(int memFactor, long now) {
        final int state = (mStartedState != STATE_NOTHING || mBoundState != STATE_NOTHING
                || mExecState != STATE_NOTHING || mForegroundState != STATE_NOTHING)
                ? memFactor : STATE_NOTHING;
        if (mRunState != state) {
            if (mRunState != STATE_NOTHING) {
                mDurations.addDuration(SERVICE_RUN + (mRunState*SERVICE_COUNT),
                        now - mRunStartTime);
            } else if (state != STATE_NOTHING) {
                mRunCount++;
            }
            mRunState = state;
            mRunStartTime = now;
        }
    }

    public void setStarted(boolean started, int memFactor, long now) {
        if (mOwner == null) {
            Slog.wtf(TAG, "Starting service " + this + " without owner");
        }
        mStarted = started;
        updateStartedState(memFactor, now);
    }

    public void setRestarting(boolean restarting, int memFactor, long now) {
        mRestarting = restarting;
        updateStartedState(memFactor, now);
    }

    public void updateStartedState(int memFactor, long now) {
        final boolean wasStarted = mStartedState != STATE_NOTHING;
        final boolean started = mStarted || mRestarting;
        final int state = started ? memFactor : STATE_NOTHING;
        if (mStartedState != state) {
            if (mStartedState != STATE_NOTHING) {
                mDurations.addDuration(SERVICE_STARTED + (mStartedState*SERVICE_COUNT),
                        now - mStartedStartTime);
            } else if (started) {
                mStartedCount++;
            }
            mStartedState = state;
            mStartedStartTime = now;
            mProc = mProc.pullFixedProc(mPackage);
            if (wasStarted != started) {
                if (started) {
                    mProc.incStartedServices(memFactor, now, mName);
                } else {
                    mProc.decStartedServices(memFactor, now, mName);
                }
            }
            updateRunning(memFactor, now);
        }
    }

    public void setBound(boolean bound, int memFactor, long now) {
        if (mOwner == null) {
            Slog.wtf(TAG, "Binding service " + this + " without owner");
        }
        final int state = bound ? memFactor : STATE_NOTHING;
        if (mBoundState != state) {
            if (mBoundState != STATE_NOTHING) {
                mDurations.addDuration(SERVICE_BOUND + (mBoundState*SERVICE_COUNT),
                        now - mBoundStartTime);
            } else if (bound) {
                mBoundCount++;
            }
            mBoundState = state;
            mBoundStartTime = now;
            updateRunning(memFactor, now);
        }
    }

    public void setExecuting(boolean executing, int memFactor, long now) {
        if (mOwner == null) {
            Slog.wtf(TAG, "Executing service " + this + " without owner");
        }
        final int state = executing ? memFactor : STATE_NOTHING;
        if (mExecState != state) {
            if (mExecState != STATE_NOTHING) {
                mDurations.addDuration(SERVICE_EXEC + (mExecState*SERVICE_COUNT),
                        now - mExecStartTime);
            } else if (executing) {
                mExecCount++;
            }
            mExecState = state;
            mExecStartTime = now;
            updateRunning(memFactor, now);
        }
    }

    public void setForeground(boolean foreground, int memFactor, long now) {
        if (mOwner == null) {
            Slog.wtf(TAG, "Foregrounding service " + this + " without owner");
        }
        final int state = foreground ? memFactor : STATE_NOTHING;
        if (mForegroundState != state) {
            if (mForegroundState != STATE_NOTHING) {
                mDurations.addDuration(SERVICE_FOREGROUND + (mForegroundState*SERVICE_COUNT),
                        now - mForegroundStartTime);
            } else if (foreground) {
                mForegroundCount++;
            }
            mForegroundState = state;
            mForegroundStartTime = now;
            updateRunning(memFactor, now);
        }
    }

    public long getDuration(int opType, int curState, long startTime, int memFactor,
            long now) {
        int state = opType + (memFactor*SERVICE_COUNT);
        long time = mDurations.getValueForId((byte)state);
        if (curState == memFactor) {
            time += now - startTime;
        }
        return time;
    }

    public void dumpStats(PrintWriter pw, String prefix, String prefixInner, String headerPrefix,
            long now, long totalTime, boolean dumpSummary, boolean dumpAll) {
        dumpStats(pw, prefix, prefixInner, headerPrefix, "Running",
                mRunCount, ServiceState.SERVICE_RUN, mRunState,
                mRunStartTime, now, totalTime, !dumpSummary || dumpAll);
        dumpStats(pw, prefix, prefixInner, headerPrefix, "Started",
                mStartedCount, ServiceState.SERVICE_STARTED, mStartedState,
                mStartedStartTime, now, totalTime, !dumpSummary || dumpAll);
        dumpStats(pw, prefix, prefixInner, headerPrefix, "Foreground",
                mForegroundCount, ServiceState.SERVICE_FOREGROUND, mForegroundState,
                mForegroundStartTime, now, totalTime, !dumpSummary || dumpAll);
        dumpStats(pw, prefix, prefixInner, headerPrefix, "Bound",
                mBoundCount, ServiceState.SERVICE_BOUND, mBoundState,
                mBoundStartTime, now, totalTime, !dumpSummary || dumpAll);
        dumpStats(pw, prefix, prefixInner, headerPrefix, "Executing",
                mExecCount, ServiceState.SERVICE_EXEC, mExecState,
                mExecStartTime, now, totalTime, !dumpSummary || dumpAll);
        if (dumpAll) {
            if (mOwner != null) {
                pw.print("        mOwner="); pw.println(mOwner);
            }
            if (mStarted || mRestarting) {
                pw.print("        mStarted="); pw.print(mStarted);
                pw.print(" mRestarting="); pw.println(mRestarting);
            }
        }
    }

    private void dumpStats(PrintWriter pw, String prefix, String prefixInner,
            String headerPrefix, String header,
            int count, int serviceType, int state, long startTime, long now, long totalTime,
            boolean dumpAll) {
        if (count != 0) {
            if (dumpAll) {
                pw.print(prefix); pw.print(header);
                pw.print(" op count "); pw.print(count); pw.println(":");
                dumpTime(pw, prefixInner, serviceType, state, startTime, now);
            } else {
                long myTime = dumpTimeInternal(null, null, serviceType, state, startTime, now,
                        true);
                pw.print(prefix); pw.print(headerPrefix); pw.print(header);
                pw.print(" count "); pw.print(count);
                pw.print(" / time ");
                boolean isRunning = myTime < 0;
                if (isRunning) {
                    myTime = -myTime;
                }
                DumpUtils.printPercent(pw, (double)myTime/(double)totalTime);
                if (isRunning) {
                    pw.print(" (running)");
                }
                pw.println();
            }
        }
    }

    public long dumpTime(PrintWriter pw, String prefix,
            int serviceType, int curState, long curStartTime, long now) {
        return dumpTimeInternal(pw, prefix, serviceType, curState, curStartTime, now, false);
    }

    long dumpTimeInternal(PrintWriter pw, String prefix,
            int serviceType, int curState, long curStartTime, long now, boolean negativeIfRunning) {
        long totalTime = 0;
        int printedScreen = -1;
        boolean isRunning = false;
        for (int iscreen=0; iscreen




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