import storm.trident.operation.impl.TrueFilter; //导入依赖的package包/类
public Stream partition(Grouping grouping) {
    if(_node instanceof PartitionNode) {
        return each(new Fields(), new TrueFilter()).partition(grouping);
    } else {
        return _topology.addSourcedNode(this, new PartitionNode(_node.streamId, _name, getOutputFields(), grouping));       
    }
}
 

import storm.trident.operation.impl.TrueFilter; //导入依赖的package包/类
public Stream partition(Grouping grouping) {
    if (_node instanceof PartitionNode) {
        return each(new Fields(), new TrueFilter()).partition(grouping);
    } else {
        return _topology.addSourcedNode(this, new PartitionNode(_node.streamId, _name, getOutputFields(), grouping));
    }
}
 

import storm.trident.operation.impl.TrueFilter; //导入依赖的package包/类
private Node makeIdentityNode(Fields allOutputFields) {
    return new ProcessorNode(getUniqueStreamId(), null, allOutputFields, new Fields(),
            new EachProcessor(new Fields(), new FilterExecutor(new TrueFilter())));
}
 

import storm.trident.operation.impl.TrueFilter; //导入依赖的package包/类
/**
 * ## Repartitioning Operation
 *
 * This method takes in a custom partitioning function that implements
 * {@link org.apache.storm.grouping.CustomStreamGrouping}
 *
 * @param grouping
 * @return
 */
public Stream partition(Grouping grouping) {
    if (_node instanceof PartitionNode) {
        return each(new Fields(), new TrueFilter()).partition(grouping);
    } else {
        return _topology.addSourcedNode(this, new PartitionNode(_node.streamId, _name, getOutputFields(), grouping));
    }
}