dubbo BroadcastClusterInvoker 源码

dubbo BroadcastClusterInvoker 代码

文件路径：/dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/support/BroadcastClusterInvoker.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.dubbo.rpc.cluster.support;

import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.logger.ErrorTypeAwareLogger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.rpc.Invocation;
import org.apache.dubbo.rpc.Invoker;
import org.apache.dubbo.rpc.Result;
import org.apache.dubbo.rpc.RpcContext;
import org.apache.dubbo.rpc.RpcException;
import org.apache.dubbo.rpc.RpcInvocation;
import org.apache.dubbo.rpc.cluster.Directory;
import org.apache.dubbo.rpc.cluster.LoadBalance;

import java.util.Collections;
import java.util.HashMap;
import java.util.List;

import static org.apache.dubbo.common.constants.LoggerCodeConstants.CLUSTER_ERROR_RESPONSE;

/**
 * BroadcastClusterInvoker
 */
public class BroadcastClusterInvoker<T> extends AbstractClusterInvoker<T> {

    private static final ErrorTypeAwareLogger logger = LoggerFactory.getErrorTypeAwareLogger(BroadcastClusterInvoker.class);
    private static final String BROADCAST_FAIL_PERCENT_KEY = "broadcast.fail.percent";
    private static final int MAX_BROADCAST_FAIL_PERCENT = 100;
    private static final int MIN_BROADCAST_FAIL_PERCENT = 0;

    public BroadcastClusterInvoker(Directory<T> directory) {
        super(directory);
    }

    @Override
    @SuppressWarnings({"unchecked", "rawtypes"})
    public Result doInvoke(final Invocation invocation, List<Invoker<T>> invokers, LoadBalance loadbalance) throws RpcException {
        checkInvokers(invokers, invocation);
        RpcContext.getServiceContext().setInvokers((List) invokers);
        RpcException exception = null;
        Result result = null;
        URL url = getUrl();
        // The value range of broadcast.fail.threshold must be 0～100.
        // 100 means that an exception will be thrown last, and 0 means that as long as an exception occurs, it will be thrown.
        // see https://github.com/apache/dubbo/pull/7174
        int broadcastFailPercent = url.getParameter(BROADCAST_FAIL_PERCENT_KEY, MAX_BROADCAST_FAIL_PERCENT);

        if (broadcastFailPercent < MIN_BROADCAST_FAIL_PERCENT || broadcastFailPercent > MAX_BROADCAST_FAIL_PERCENT) {
            logger.info(String.format("The value corresponding to the broadcast.fail.percent parameter must be between 0 and 100. " +
                    "The current setting is %s, which is reset to 100.", broadcastFailPercent));
            broadcastFailPercent = MAX_BROADCAST_FAIL_PERCENT;
        }

        int failThresholdIndex = invokers.size() * broadcastFailPercent / MAX_BROADCAST_FAIL_PERCENT;
        int failIndex = 0;
        for (int i = 0, invokersSize = invokers.size(); i < invokersSize; i++) {
            Invoker<T> invoker = invokers.get(i);
            RpcContext.RestoreContext restoreContext = new RpcContext.RestoreContext();
            try {
                RpcInvocation subInvocation = new RpcInvocation(invocation.getTargetServiceUniqueName(),
                    invocation.getServiceModel(), invocation.getMethodName(), invocation.getServiceName(), invocation.getProtocolServiceKey(),
                    invocation.getParameterTypes(), invocation.getArguments(), invocation.copyObjectAttachments(),
                    invocation.getInvoker(), Collections.synchronizedMap(new HashMap<>(invocation.getAttributes())),
                    invocation instanceof RpcInvocation ? ((RpcInvocation) invocation).getInvokeMode() : null);
                result = invokeWithContext(invoker, subInvocation);
                if (null != result && result.hasException()) {
                    Throwable resultException = result.getException();
                    if (null != resultException) {
                        exception = getRpcException(result.getException());
                        logger.warn(CLUSTER_ERROR_RESPONSE,"provider return error response","",exception.getMessage(),exception);
                        failIndex++;
                        if (failIndex == failThresholdIndex) {
                            break;
                        }
                    }
                }
            } catch (Throwable e) {
                exception = getRpcException(e);
                logger.warn(CLUSTER_ERROR_RESPONSE,"provider return error response","",exception.getMessage(),exception);
                failIndex++;
                if (failIndex == failThresholdIndex) {
                    break;
                }
            } finally {
                if (i != invokersSize - 1) {
                    restoreContext.restore();
                }
            }
        }

        if (exception != null) {
            if (failIndex == failThresholdIndex) {
                if (logger.isDebugEnabled()) {
                    logger.debug(
                        String.format("The number of BroadcastCluster call failures has reached the threshold %s", failThresholdIndex));

                }
            } else {
                if (logger.isDebugEnabled()) {
                    logger.debug(String.format("The number of BroadcastCluster call failures has not reached the threshold %s, fail size is %s",
                        failThresholdIndex, failIndex));
                }
            }
            throw exception;
        }

        return result;
    }

    private RpcException getRpcException(Throwable throwable) {
        RpcException rpcException;
        if (throwable instanceof RpcException) {
            rpcException = (RpcException) throwable;
        } else {
            rpcException = new RpcException(throwable.getMessage(), throwable);
        }
        return rpcException;
    }
}

相关信息

dubbo 源码目录

相关文章

dubbo AbstractClusterInvoker 源码

dubbo AvailableCluster 源码

dubbo AvailableClusterInvoker 源码

dubbo BroadcastCluster 源码

dubbo ClusterUtils 源码

dubbo FailbackCluster 源码

dubbo FailbackClusterInvoker 源码

dubbo FailfastCluster 源码

dubbo FailfastClusterInvoker 源码

dubbo FailoverCluster 源码