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/*
* Copyright 2019 NAVER Corp.
*
* 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.navercorp.pinpoint.grpc.server.flowcontrol;
import com.navercorp.pinpoint.common.util.Assert;
import com.navercorp.pinpoint.grpc.Header;
import io.grpc.Context;
import io.grpc.ForwardingServerCallListener;
import io.grpc.Metadata;
import io.grpc.ServerCall;
import io.grpc.ServerCallHandler;
import io.grpc.ServerInterceptor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Objects;
import java.util.concurrent.Executor;
import java.util.concurrent.RejectedExecutionException;
/**
* @author jaehong.kim
*/
public class StreamExecutorServerInterceptor implements ServerInterceptor {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
private final String name;
private final Executor executor;
private final int initNumMessages;
private final StreamExecutorRejectedExecutionRequestScheduler scheduler;
public StreamExecutorServerInterceptor(String name, final Executor executor, final int initNumMessages, final ScheduledExecutor scheduledExecutor,
RejectedExecutionListenerFactory listenerFactory) {
this.name = Objects.requireNonNull(name, "name");
Objects.requireNonNull(executor, "executor");
// Context wrapper
this.executor = Context.currentContextExecutor(executor);
Assert.isTrue(initNumMessages > 0, "initNumMessages must be positive");
this.initNumMessages = initNumMessages;
Objects.requireNonNull(scheduledExecutor, "scheduledExecutor");
Objects.requireNonNull(listenerFactory, "listenerFactory");
this.scheduler = new StreamExecutorRejectedExecutionRequestScheduler(scheduledExecutor, listenerFactory);
}
@Override
public ServerCall.Listener interceptCall(final ServerCall call, Metadata headers, ServerCallHandler next) {
final ServerCallWrapper serverCall = newServerCallWrapper(call, headers);
final StreamExecutorRejectedExecutionRequestScheduler.Listener scheduleListener = this.scheduler.schedule(serverCall);
if (logger.isInfoEnabled()) {
logger.info("Initialize schedule listener. {} {}, headers={}, initNumMessages={}, scheduler={}, listener={}",
this.name, call.getMethodDescriptor().getFullMethodName(), headers, initNumMessages, scheduler, scheduleListener);
}
final ServerCall.Listener listener = next.startCall(call, headers);
// Init MessageDeframer.pendingDeliveries
call.request(initNumMessages);
return new ForwardingServerCallListener.SimpleForwardingServerCallListener(listener) {
@Override
public void onMessage(final ReqT message) {
try {
executor.execute(new Runnable() {
@Override
public void run() {
scheduleListener.onMessage();
delegate().onMessage(message);
}
});
// scheduleListener.onMessage();
} catch (RejectedExecutionException ree) {
// Defense code, need log ?
scheduleListener.onRejectedExecution();
logger.warn("Failed to request. Rejected execution, count={}", scheduleListener.getRejectedExecutionCount());
}
}
@Override
public void onCancel() {
scheduleListener.onCancel();
delegate().onCancel();
}
@Override
public void onComplete() {
scheduleListener.onCancel();
delegate().onComplete();
}
};
}
private ServerCallWrapper newServerCallWrapper(ServerCall call, Metadata headers) {
final String agentId = headers.get(Header.AGENT_ID_KEY);
final String applicationName = headers.get(Header.APPLICATION_NAME_KEY);
return new DefaultServerCallWrapper<>(call, applicationName, agentId);
}
}