86 lines
3.4 KiB
Java
86 lines
3.4 KiB
Java
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/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.net;
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import android.annotation.NonNull;
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import android.os.ParcelFileDescriptor;
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import android.os.RemoteException;
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import android.util.Log;
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import java.util.concurrent.Executor;
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/** @hide */
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public final class TcpSocketKeepalive extends SocketKeepalive {
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public TcpSocketKeepalive(@NonNull IConnectivityManager service,
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@NonNull Network network,
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@NonNull ParcelFileDescriptor pfd,
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@NonNull Executor executor,
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@NonNull Callback callback) {
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super(service, network, pfd, executor, callback);
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}
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/**
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* Starts keepalives. {@code mSocket} must be a connected TCP socket.
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*
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* - The application must not write to or read from the socket after calling this method, until
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* onDataReceived, onStopped, or onError are called. If it does, the keepalive will fail
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* with {@link #ERROR_SOCKET_NOT_IDLE}, or {@code #ERROR_INVALID_SOCKET} if the socket
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* experienced an error (as in poll(2) returned POLLERR or POLLHUP); if this happens, the data
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* received from the socket may be invalid, and the socket can't be recovered.
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* - If the socket has data in the send or receive buffer, then this call will fail with
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* {@link #ERROR_SOCKET_NOT_IDLE} and can be retried after the data has been processed.
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* An app could ensure this by using an application-layer protocol to receive acknowledgement
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* that indicates all data has been delivered to server, e.g. HTTP 200 OK.
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* Then the app could go into keepalive mode after reading all remaining data within the
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* acknowledgement.
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*/
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@Override
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protected void startImpl(int intervalSec, int flags, Network underpinnedNetwork) {
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if (0 != flags) {
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throw new IllegalArgumentException("Illegal flag value for "
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+ this.getClass().getSimpleName() + " : " + flags);
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}
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if (underpinnedNetwork != null) {
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throw new IllegalArgumentException("Illegal underpinned network for "
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+ this.getClass().getSimpleName() + " : " + underpinnedNetwork);
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}
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mExecutor.execute(() -> {
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try {
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mService.startTcpKeepalive(mNetwork, mPfd, intervalSec, mCallback);
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} catch (RemoteException e) {
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Log.e(TAG, "Error starting packet keepalive: ", e);
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throw e.rethrowFromSystemServer();
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}
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});
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}
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@Override
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protected void stopImpl() {
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mExecutor.execute(() -> {
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try {
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mService.stopKeepalive(mCallback);
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} catch (RemoteException e) {
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Log.e(TAG, "Error stopping packet keepalive: ", e);
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throw e.rethrowFromSystemServer();
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}
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});
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}
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}
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