| |
| // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| #![feature(managed_boxes)] |
| |
| extern crate collections; |
| extern crate debug; |
| |
| /** |
| A somewhat reduced test case to expose some Valgrind issues. |
| |
| This originally came from the word-count benchmark. |
| */ |
| |
| pub fn map(filename: String, emit: map_reduce::putter) { |
| emit(filename, "1".to_string()); |
| } |
| |
| mod map_reduce { |
| use std::collections::HashMap; |
| use std::str; |
| use std::task; |
| |
| pub type putter<'a> = |String, String|: 'a; |
| |
| pub type mapper = extern fn(String, putter); |
| |
| enum ctrl_proto { find_reducer(Vec<u8>, Sender<int>), mapper_done, } |
| |
| fn start_mappers(ctrl: Sender<ctrl_proto>, inputs: Vec<String>) { |
| for i in inputs.iter() { |
| let ctrl = ctrl.clone(); |
| let i = i.clone(); |
| task::spawn(proc() map_task(ctrl.clone(), i.clone()) ); |
| } |
| } |
| |
| fn map_task(ctrl: Sender<ctrl_proto>, input: String) { |
| let mut intermediates = HashMap::new(); |
| |
| fn emit(im: &mut HashMap<String, int>, |
| ctrl: Sender<ctrl_proto>, key: String, |
| _val: String) { |
| if im.contains_key(&key) { |
| return; |
| } |
| let (tx, rx) = channel(); |
| println!("sending find_reducer"); |
| ctrl.send(find_reducer(Vec::from_slice(key.as_bytes()), tx)); |
| println!("receiving"); |
| let c = rx.recv(); |
| println!("{:?}", c); |
| im.insert(key, c); |
| } |
| |
| let ctrl_clone = ctrl.clone(); |
| ::map(input, |a,b| emit(&mut intermediates, ctrl.clone(), a, b) ); |
| ctrl_clone.send(mapper_done); |
| } |
| |
| pub fn map_reduce(inputs: Vec<String>) { |
| let (tx, rx) = channel(); |
| |
| // This task becomes the master control task. It spawns others |
| // to do the rest. |
| |
| let mut reducers: HashMap<String, int>; |
| |
| reducers = HashMap::new(); |
| |
| start_mappers(tx, inputs.clone()); |
| |
| let mut num_mappers = inputs.len() as int; |
| |
| while num_mappers > 0 { |
| match rx.recv() { |
| mapper_done => { num_mappers -= 1; } |
| find_reducer(k, cc) => { |
| let mut c; |
| match reducers.find(&str::from_utf8( |
| k.as_slice()).unwrap().to_string()) { |
| Some(&_c) => { c = _c; } |
| None => { c = 0; } |
| } |
| cc.send(c); |
| } |
| } |
| } |
| } |
| } |
| |
| pub fn main() { |
| map_reduce::map_reduce( |
| vec!("../src/test/run-pass/hashmap-memory.rs".to_string())); |
| } |