AsyncQuery.java

/*
 * Copyright 2012-2017 Aerospike, Inc.
 *
 * Portions may be licensed to Aerospike, Inc. under one or more contributor
 * license agreements WHICH ARE COMPATIBLE WITH THE APACHE LICENSE, VERSION 2.0.
 *
 * Licensed 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 com.aerospike.examples;

import java.util.concurrent.atomic.AtomicInteger;

import com.aerospike.client.AerospikeException;
import com.aerospike.client.Bin;
import com.aerospike.client.Key;
import com.aerospike.client.Record;
import com.aerospike.client.async.AsyncClient;
import com.aerospike.client.command.Buffer;
import com.aerospike.client.listener.RecordSequenceListener;
import com.aerospike.client.listener.WriteListener;
import com.aerospike.client.policy.Policy;
import com.aerospike.client.query.Filter;
import com.aerospike.client.query.IndexType;
import com.aerospike.client.query.Statement;
import com.aerospike.client.task.IndexTask;
import com.aerospike.client.util.Util;

public class AsyncQuery extends AsyncExample {
		
	private boolean completed;

	public AsyncQuery(Console console) {
		super(console);
	}

	/**
	 * Asynchronous query example.
	 */
	@Override
	public void runExample(AsyncClient client, Parameters params) throws Exception {
		if (! params.hasUdf) {
			console.info("Query functions are not supported by the connected Aerospike server.");
			return;
		}
		
		String indexName = "asqindex";
		String keyPrefix = "asqkey";
		String binName = params.getBinName("asqbin");  
		int size = 50;

		createIndex(client, params, indexName, binName);
		runQueryExample(client, params, keyPrefix, binName, size);
		waitTillComplete();
		client.dropIndex(params.policy, params.namespace, params.set, indexName);		
	}
	
	private void createIndex(
		AsyncClient client,
		Parameters params,
		String indexName,
		String binName
	) throws Exception {
		console.info("Create index: ns=%s set=%s index=%s bin=%s",
			params.namespace, params.set, indexName, binName);			
		
		Policy policy = new Policy();
		policy.timeout = 0; // Do not timeout on index create.
		IndexTask task = client.createIndex(policy, params.namespace, params.set, indexName, binName, IndexType.NUMERIC);
		task.waitTillComplete();
	}

	private void runQueryExample(
		final AsyncClient client,
		final Parameters params,
		final String keyPrefix,
		final String binName,
		final int size
	) throws Exception {
		console.info("Write " + size + " records.");

		final AtomicInteger count = new AtomicInteger();

		for (int i = 1; i <= size; i++) {
			final Key key = new Key(params.namespace, params.set, keyPrefix + i);
			Bin bin = new Bin(binName, i);
			
			client.put(params.writePolicy, new WriteListener() {				
				public void onSuccess(final Key key) {
					if (count.incrementAndGet() == size) {
						runQuery(client, params, binName);
					}
				}
				
				public void onFailure(AerospikeException e) {
					console.error("Failed to put: namespace=%s set=%s key=%s exception=%s", key.namespace, key.setName, key.userKey, e.getMessage());
					notifyComplete();
				}
			}, key, bin);		
		}
	}

	private void runQuery(AsyncClient client, Parameters params, final String binName) {
		int begin = 26;
		int end = 34;
		
		console.info("Query for: ns=%s set=%s bin=%s >= %s <= %s",
			params.namespace, params.set, binName, begin, end);			
		
		Statement stmt = new Statement();
		stmt.setNamespace(params.namespace);
		stmt.setSetName(params.set);
		stmt.setBinNames(binName);
		stmt.setFilter(Filter.range(binName, begin, end));
		
		final AtomicInteger count = new AtomicInteger();
		
		client.query(null, new RecordSequenceListener() {
			public void onRecord(Key key, Record record) throws AerospikeException {
				int result = record.getInt(binName);
				
				console.info("Record found: ns=%s set=%s bin=%s digest=%s value=%s",
					key.namespace, key.setName, binName, Buffer.bytesToHexString(key.digest), result);
				
				count.incrementAndGet();
			}

			public void onSuccess() {
				int size = count.get();
				
				if (size != 9) {
					console.error("Query count mismatch. Expected 9. Received " + size);			
				}
				notifyComplete();
			}

			public void onFailure(AerospikeException e) {
				console.error("Query failed: " + Util.getErrorMessage(e));
				notifyComplete();
			} 
			
		}, stmt);	
	}

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

	private synchronized void notifyComplete() {
		completed = true;
		super.notify();
	}
}