Merge "Allow callers to synchronously block for shutdown"

import java.util.List;

import java.util.Set;

import java.util.StringJoiner;

import java.util.concurrent.CountDownLatch;

import java.util.function.Predicate;

import java.util.stream.Collectors;

    /**

     * Callbacks for handling IpClient events.

     *

     * These methods are called by IpClient on its own thread. Implementations

     * of this class MUST NOT carry out long-running computations or hold locks

     * for which there might be contention with other code calling public

     * methods of the same IpClient instance.

     */

    public static class Callback {

        // In order to receive onPreDhcpAction(), call #withPreDhcpAction()

    private final String mClatInterfaceName;

    @VisibleForTesting

    protected final Callback mCallback;

    private final CountDownLatch mShutdownLatch;

    private final INetworkManagementService mNwService;

    private final NetlinkTracker mNetlinkTracker;

    private final WakeupMessage mProvisioningTimeoutAlarm;

        mInterfaceName = ifName;

        mClatInterfaceName = CLAT_PREFIX + ifName;

        mCallback = new LoggingCallbackWrapper(callback);

        mShutdownLatch = new CountDownLatch(1);

        mNwService = nwService;

        mLog = new SharedLog(MAX_LOG_RECORDS, mTag);

    @Override

    protected void onQuitting() {

        mCallback.onQuit();

        mShutdownLatch.countDown();

    }

    // Shut down this IpClient instance altogether.

        sendMessage(CMD_TERMINATE_AFTER_STOP);

    }

    // In order to avoid deadlock, this method MUST NOT be called on the

    // IpClient instance's thread. This prohibition includes code executed by

    // when methods on the passed-in IpClient.Callback instance are called.

    public void awaitShutdown() {

        try {

            mShutdownLatch.await();

        } catch (InterruptedException e) {

            mLog.e("Interrupted while awaiting shutdown: " + e);

        }

    }

    public static ProvisioningConfiguration.Builder buildProvisioningConfiguration() {

        return new ProvisioningConfiguration.Builder();

    }