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Aerospike v3 Scala Client
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/*******************************************************************************
 * Copyright 2012-2014 by Aerospike.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 ******************************************************************************/
package com.aerospike.client.query;

import java.util.Random;
import java.util.concurrent.ExecutorService;

import com.aerospike.client.AerospikeException;
import com.aerospike.client.ResultCode;
import com.aerospike.client.Value;
import com.aerospike.client.cluster.Cluster;
import com.aerospike.client.cluster.Node;
import com.aerospike.client.policy.Policy;

public final class ServerExecutor {
	
	private final ServerThread[] threads;
	private volatile Exception exception;
	private boolean completed;
	
	public ServerExecutor(
		Cluster cluster,
		Policy policy,
		Statement statement,
		String packageName, 
		String functionName, 
		Value[] functionArgs
	) throws AerospikeException {
		statement.setAggregateFunction(packageName, functionName, functionArgs, false);
		
		if (statement.taskId == 0) {
			Random r = new Random();
			statement.taskId = r.nextInt(Integer.MAX_VALUE);
		}
		
		Node[] nodes = cluster.getNodes();
		if (nodes.length == 0) {
			throw new AerospikeException(ResultCode.SERVER_NOT_AVAILABLE, "Command failed because cluster is empty.");
		}

		threads = new ServerThread[nodes.length];
		
		for (int i = 0; i < nodes.length; i++) {
			ServerCommand command = new ServerCommand(nodes[i], policy, statement);
			threads[i] = new ServerThread(command);
		}
		
		ExecutorService threadPool = cluster.getThreadPool();

		for (int i = 0; i < nodes.length; i++) {
			threadPool.execute(threads[i]);
		}
		waitTillComplete();
		
		// Throw an exception if an error occurred.
		if (exception != null) {
			if (exception instanceof AerospikeException) {
				throw (AerospikeException)exception;		
			}
			else {
				throw new AerospikeException(exception);
			}		
		}		
	}

	private void threadCompleted() {
		// Check status of other threads.
		for (ServerThread thread : threads) {
			if (! thread.complete) {
				// Some threads have not finished. Do nothing.
				return;
			}
		}
		// All threads complete.
		notifyCompleted();
	}

	private void stopThreads(Exception cause) {
    	synchronized (threads) {
    	   	if (exception != null) {
    	   		return;
    	   	}
	    	exception = cause;  		
    	}
    	
		for (ServerThread thread : threads) {
			try {
				thread.stop();
			}
			catch (Exception e) {
			}
		}
		notifyCompleted();
    }

	private synchronized void waitTillComplete() {
		while (! completed) {
			try {
				super.wait();
			}
			catch (InterruptedException ie) {
			}
		}
	}
	
	private synchronized void notifyCompleted() {
		completed = true;
		super.notify();
	}

	private final class ServerThread implements Runnable {
		private final ServerCommand command;
		private Thread thread;
		private volatile boolean complete;

		public ServerThread(ServerCommand command) {
			this.command = command;
		}
		
		public void run() {
			thread = Thread.currentThread();

			try {
				if (command.isValid()) {
					command.execute();
				}
			}
			catch (Exception e) {
				// Terminate other threads.
				stopThreads(e);
			}
			complete = true;
			
		   	if (exception == null) {
				threadCompleted();
		   	}
		}
		
		public void stop() {
			command.stop();
			
			if (thread != null) {
				thread.interrupt();
			}
		}
	}
}