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// Copyright 2021 The Pigweed Authors
//
// 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
//
// https://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 dev.pigweed.pw_rpc;
// import com.google.common.flogger.FluentLogger;
import com.google.protobuf.MessageLite;
import java.util.HashMap;
import java.util.Map;
import javax.annotation.Nullable;
/** Tracks the state of service method invocations. */
public class RpcManager {
// TODO(pwbug/611): Restore logging without a mandatory Flogger dependency.
// private static final FluentLogger logger = FluentLogger.forEnclosingClass();
private final Map<PendingRpc, StreamObserverCall<?, ?>> pending = new HashMap<>();
/**
* Invokes an RPC.
*
* @param rpc channel / service / method tuple that unique identifies this RPC
* @param call object for this RPC
* @param payload the request
*/
@Nullable
public synchronized StreamObserverCall<?, ?> start(
PendingRpc rpc, StreamObserverCall<?, ?> call, @Nullable MessageLite payload)
throws ChannelOutputException {
// logger.atFine().log("Start %s", rpc);
rpc.channel().send(Packets.request(rpc, payload));
return pending.put(rpc, call);
}
/**
* Invokes an RPC, but ignores errors and keeps the RPC active if the invocation fails.
*
* <p>The RPC remains open until it is closed by the server (either with a response or error
* packet) or cancelled.
*/
@Nullable
public synchronized StreamObserverCall<?, ?> open(
PendingRpc rpc, StreamObserverCall<?, ?> call, @Nullable MessageLite payload) {
// logger.atFine().log("Open %s", rpc);
try {
rpc.channel().send(Packets.request(rpc, payload));
} catch (ChannelOutputException e) {
// logger.atFine().withCause(e).log(
// "Ignoring error opening %s; listening for unrequested responses", rpc);
}
return pending.put(rpc, call);
}
/** Cancels an ongoing RPC */
@Nullable
public synchronized StreamObserverCall<?, ?> cancel(PendingRpc rpc)
throws ChannelOutputException {
StreamObserverCall<?, ?> call = pending.remove(rpc);
if (call != null) {
// logger.atFine().log("Cancel %s", rpc);
rpc.channel().send(Packets.cancel(rpc));
}
return call;
}
@Nullable
public synchronized StreamObserverCall<?, ?> clientStream(PendingRpc rpc, MessageLite payload)
throws ChannelOutputException {
StreamObserverCall<?, ?> call = pending.get(rpc);
if (call != null) {
rpc.channel().send(Packets.clientStream(rpc, payload));
}
return call;
}
@Nullable
public synchronized StreamObserverCall<?, ?> clientStreamEnd(PendingRpc rpc)
throws ChannelOutputException {
StreamObserverCall<?, ?> call = pending.get(rpc);
if (call != null) {
rpc.channel().send(Packets.clientStreamEnd(rpc));
}
return call;
}
@Nullable
public synchronized StreamObserverCall<?, ?> clear(PendingRpc rpc) {
StreamObserverCall<?, ?> call = pending.remove(rpc);
if (call != null) {
// logger.atFine().log("Clear %s", rpc);
}
return call;
}
@Nullable
public synchronized StreamObserverCall<?, ?> getPending(PendingRpc rpc) {
return pending.get(rpc);
}
@Override
public synchronized String toString() {
return "RpcManager{"
+ "pending=" + pending + '}';
}
}
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