Examples with Merger com.alibaba.dubbo.rpc.cluster.Merger used on opensource projects

Example 1 with Merger

use of com.alibaba.dubbo.rpc.cluster.Merger in project dubbo by alibaba.

the class MergerFactory method getMerger.

public static <T> Merger<T> getMerger(Class<T> returnType) {
    Merger result;
    if (returnType.isArray()) {
        Class type = returnType.getComponentType();
        result = mergerCache.get(type);
        if (result == null) {
            loadMergers();
            result = mergerCache.get(type);
        }
        if (result == null && !type.isPrimitive()) {
            result = ArrayMerger.INSTANCE;
        }
    } else {
        result = mergerCache.get(returnType);
        if (result == null) {
            loadMergers();
            result = mergerCache.get(returnType);
        }
    }
    return result;
}

Example 2 with Merger

use of com.alibaba.dubbo.rpc.cluster.Merger in project dubbo by alibaba.

the class MergeableClusterInvoker method invoke.

@SuppressWarnings("rawtypes")
public Result invoke(final Invocation invocation) throws RpcException {
    List<Invoker<T>> invokers = directory.list(invocation);
    String merger = getUrl().getMethodParameter(invocation.getMethodName(), Constants.MERGER_KEY);
    if (ConfigUtils.isEmpty(merger)) {
        // If a method doesn't have a merger, only invoke one Group
        for (final Invoker<T> invoker : invokers) {
            if (invoker.isAvailable()) {
                return invoker.invoke(invocation);
            }
        }
        return invokers.iterator().next().invoke(invocation);
    }
    Class<?> returnType;
    try {
        returnType = getInterface().getMethod(invocation.getMethodName(), invocation.getParameterTypes()).getReturnType();
    } catch (NoSuchMethodException e) {
        returnType = null;
    }
    Map<String, Future<Result>> results = new HashMap<String, Future<Result>>();
    for (final Invoker<T> invoker : invokers) {
        Future<Result> future = executor.submit(new Callable<Result>() {

            public Result call() throws Exception {
                return invoker.invoke(new RpcInvocation(invocation, invoker));
            }
        });
        results.put(invoker.getUrl().getServiceKey(), future);
    }
    Object result = null;
    List<Result> resultList = new ArrayList<Result>(results.size());
    int timeout = getUrl().getMethodParameter(invocation.getMethodName(), Constants.TIMEOUT_KEY, Constants.DEFAULT_TIMEOUT);
    for (Map.Entry<String, Future<Result>> entry : results.entrySet()) {
        Future<Result> future = entry.getValue();
        try {
            Result r = future.get(timeout, TimeUnit.MILLISECONDS);
            if (r.hasException()) {
                log.error(new StringBuilder(32).append("Invoke ").append(getGroupDescFromServiceKey(entry.getKey())).append(" failed: ").append(r.getException().getMessage()).toString(), r.getException());
            } else {
                resultList.add(r);
            }
        } catch (Exception e) {
            throw new RpcException(new StringBuilder(32).append("Failed to invoke service ").append(entry.getKey()).append(": ").append(e.getMessage()).toString(), e);
        }
    }
    if (resultList.isEmpty()) {
        return new RpcResult((Object) null);
    } else if (resultList.size() == 1) {
        return resultList.iterator().next();
    }
    if (returnType == void.class) {
        return new RpcResult((Object) null);
    }
    if (merger.startsWith(".")) {
        merger = merger.substring(1);
        Method method;
        try {
            method = returnType.getMethod(merger, returnType);
        } catch (NoSuchMethodException e) {
            throw new RpcException(new StringBuilder(32).append("Can not merge result because missing method [ ").append(merger).append(" ] in class [ ").append(returnType.getClass().getName()).append(" ]").toString());
        }
        if (!Modifier.isPublic(method.getModifiers())) {
            method.setAccessible(true);
        }
        result = resultList.remove(0).getValue();
        try {
            if (method.getReturnType() != void.class && method.getReturnType().isAssignableFrom(result.getClass())) {
                for (Result r : resultList) {
                    result = method.invoke(result, r.getValue());
                }
            } else {
                for (Result r : resultList) {
                    method.invoke(result, r.getValue());
                }
            }
        } catch (Exception e) {
            throw new RpcException(new StringBuilder(32).append("Can not merge result: ").append(e.getMessage()).toString(), e);
        }
    } else {
        Merger resultMerger;
        if (ConfigUtils.isDefault(merger)) {
            resultMerger = MergerFactory.getMerger(returnType);
        } else {
            resultMerger = ExtensionLoader.getExtensionLoader(Merger.class).getExtension(merger);
        }
        if (resultMerger != null) {
            List<Object> rets = new ArrayList<Object>(resultList.size());
            for (Result r : resultList) {
                rets.add(r.getValue());
            }
            result = resultMerger.merge(rets.toArray((Object[]) Array.newInstance(returnType, 0)));
        } else {
            throw new RpcException("There is no merger to merge result.");
        }
    }
    return new RpcResult(result);
}

Example 3 with Merger

use of com.alibaba.dubbo.rpc.cluster.Merger in project dubbo by alibaba.

the class MergerFactory method loadMergers.

static void loadMergers() {
    Set<String> names = ExtensionLoader.getExtensionLoader(Merger.class).getSupportedExtensions();
    for (String name : names) {
        Merger m = ExtensionLoader.getExtensionLoader(Merger.class).getExtension(name);
        mergerCache.putIfAbsent(ReflectUtils.getGenericClass(m.getClass()), m);
    }
}