/*
* Copyright 2011 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.bootstrap;
import static io.netty.channel.Channels.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFactory;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.ChannelPipelineFactory;
import io.netty.util.ExternalResourceReleasable;
/**
* A helper class which initializes a {@link Channel}. This class provides
* the common data structure for its subclasses which actually initialize
* {@link Channel}s and their child {@link Channel}s using the common data
* structure. Please refer to {@link ClientBootstrap}, {@link ServerBootstrap},
* and {@link ConnectionlessBootstrap} for client side, server-side, and
* connectionless (e.g. UDP) channel initialization respectively.
* @apiviz.uses io.netty.channel.ChannelFactory
*/
public class Bootstrap implements ExternalResourceReleasable {
private volatile ChannelFactory factory;
private volatile ChannelPipeline pipeline = pipeline();
private volatile ChannelPipelineFactory pipelineFactory = pipelineFactory(pipeline);
private volatile Map<String, Object> options = new HashMap<String, Object>();
/**
* Creates a new instance with no {@link ChannelFactory} set.
* {@link #setFactory(ChannelFactory)} must be called at once before any
* I/O operation is requested.
*/
protected Bootstrap() {
}
/**
* Creates a new instance with the specified initial {@link ChannelFactory}.
*/
protected Bootstrap(ChannelFactory channelFactory) {
setFactory(channelFactory);
}
/**
* Returns the {@link ChannelFactory} that will be used to perform an
* I/O operation.
*
* @throws IllegalStateException
* if the factory is not set for this bootstrap yet.
* The factory can be set in the constructor or
* {@link #setFactory(ChannelFactory)}.
*/
public ChannelFactory getFactory() {
ChannelFactory factory = this.factory;
if (factory == null) {
throw new IllegalStateException(
"factory is not set yet.");
}
return factory;
}
/**
* Sets the {@link ChannelFactory} that will be used to perform an I/O
* operation. This method can be called only once and can't be called at
* all if the factory was specified in the constructor.
*
* @throws IllegalStateException
* if the factory is already set
*/
public void setFactory(ChannelFactory factory) {
if (factory == null) {
throw new NullPointerException("factory");
}
if (this.factory != null) {
throw new IllegalStateException(
"factory can't change once set.");
}
this.factory = factory;
}
/**
* Returns the default {@link ChannelPipeline} which is cloned when a new
* {@link Channel} is created. {@link Bootstrap} creates a new pipeline
* which has the same entries with the returned pipeline for a new
* {@link Channel}.
* <p>
* Please note that this method is a convenience method that works only
* when <b>1)</b> you create only one channel from this bootstrap (e.g.
* one-time client-side or connectionless channel) or <b>2)</b> all handlers
* in the pipeline is stateless. You have to use
* {@link #setPipelineFactory(ChannelPipelineFactory)} if <b>1)</b> your
* pipeline contains a stateful {@link ChannelHandler} and <b>2)</b> one or
* more channels are going to be created by this bootstrap (e.g. server-side
* channels).
*
* @return the default {@link ChannelPipeline}
*
* @throws IllegalStateException
* if {@link #setPipelineFactory(ChannelPipelineFactory)} was
* called by a user last time.
*/
public ChannelPipeline getPipeline() {
ChannelPipeline pipeline = this.pipeline;
if (pipeline == null) {
throw new IllegalStateException(
"getPipeline() cannot be called " +
"if setPipelineFactory() was called.");
}
return pipeline;
}
/**
* Sets the default {@link ChannelPipeline} which is cloned when a new
* {@link Channel} is created. {@link Bootstrap} creates a new pipeline
* which has the same entries with the specified pipeline for a new channel.
* <p>
* Calling this method also sets the {@code pipelineFactory} property to an
* internal {@link ChannelPipelineFactory} implementation which returns
* a shallow copy of the specified pipeline.
* <p>
* Please note that this method is a convenience method that works only
* when <b>1)</b> you create only one channel from this bootstrap (e.g.
* one-time client-side or connectionless channel) or <b>2)</b> all handlers
* in the pipeline is stateless. You have to use
* {@link #setPipelineFactory(ChannelPipelineFactory)} if <b>1)</b> your
* pipeline contains a stateful {@link ChannelHandler} and <b>2)</b> one or
* more channels are going to be created by this bootstrap (e.g. server-side
* channels).
*/
public void setPipeline(ChannelPipeline pipeline) {
if (pipeline == null) {
throw new NullPointerException("pipeline");
}
this.pipeline = pipeline;
pipelineFactory = pipelineFactory(pipeline);
}
/**
* Dependency injection friendly convenience method for
* {@link #getPipeline()} which returns the default pipeline of this
* bootstrap as an ordered map.
* <p>
* Please note that this method is a convenience method that works only
* when <b>1)</b> you create only one channel from this bootstrap (e.g.
* one-time client-side or connectionless channel) or <b>2)</b> all handlers
* in the pipeline is stateless. You have to use
* {@link #setPipelineFactory(ChannelPipelineFactory)} if <b>1)</b> your
* pipeline contains a stateful {@link ChannelHandler} and <b>2)</b> one or
* more channels are going to be created by this bootstrap (e.g. server-side
* channels).
*
* @throws IllegalStateException
* if {@link #setPipelineFactory(ChannelPipelineFactory)} was
* called by a user last time.
*/
public Map<String, ChannelHandler> getPipelineAsMap() {
ChannelPipeline pipeline = this.pipeline;
if (pipeline == null) {
throw new IllegalStateException("pipelineFactory in use");
}
return pipeline.toMap();
}
/**
* Dependency injection friendly convenience method for
* {@link #setPipeline(ChannelPipeline)} which sets the default pipeline of
* this bootstrap from an ordered map.
* <p>
* Please note that this method is a convenience method that works only
* when <b>1)</b> you create only one channel from this bootstrap (e.g.
* one-time client-side or connectionless channel) or <b>2)</b> all handlers
* in the pipeline is stateless. You have to use
* {@link #setPipelineFactory(ChannelPipelineFactory)} if <b>1)</b> your
* pipeline contains a stateful {@link ChannelHandler} and <b>2)</b> one or
* more channels are going to be created by this bootstrap (e.g. server-side
* channels).
*
* @throws IllegalArgumentException
* if the specified map is not an ordered map
*/
public void setPipelineAsMap(Map<String, ChannelHandler> pipelineMap) {
if (pipelineMap == null) {
throw new NullPointerException("pipelineMap");
}
if (!isOrderedMap(pipelineMap)) {
throw new IllegalArgumentException(
"pipelineMap is not an ordered map. " +
"Please use " +
LinkedHashMap.class.getName() + ".");
}
ChannelPipeline pipeline = pipeline();
for (Map.Entry<String, ChannelHandler> e: pipelineMap.entrySet()) {
pipeline.addLast(e.getKey(), e.getValue());
}
setPipeline(pipeline);
}
/**
* Returns the {@link ChannelPipelineFactory} which creates a new
* {@link ChannelPipeline} for each new {@link Channel}.
*
* @see #getPipeline()
*/
public ChannelPipelineFactory getPipelineFactory() {
return pipelineFactory;
}
/**
* Sets the {@link ChannelPipelineFactory} which creates a new
* {@link ChannelPipeline} for each new {@link Channel}. Calling this
* method invalidates the current {@code pipeline} property of this
* bootstrap. Subsequent {@link #getPipeline()} and {@link #getPipelineAsMap()}
* calls will raise {@link IllegalStateException}.
*
* @see #setPipeline(ChannelPipeline)
* @see #setPipelineAsMap(Map)
*/
public void setPipelineFactory(ChannelPipelineFactory pipelineFactory) {
if (pipelineFactory == null) {
throw new NullPointerException("pipelineFactory");
}
pipeline = null;
this.pipelineFactory = pipelineFactory;
}
/**
* Returns the options which configures a new {@link Channel} and its
* child {@link Channel}s. The names of the child {@link Channel} options
* are prepended with {@code "child."} (e.g. {@code "child.keepAlive"}).
*/
public Map<String, Object> getOptions() {
return new TreeMap<String, Object>(options);
}
/**
* Sets the options which configures a new {@link Channel} and its child
* {@link Channel}s. To set the options of a child {@link Channel}, prepend
* {@code "child."} to the option name (e.g. {@code "child.keepAlive"}).
*/
public void setOptions(Map<String, Object> options) {
if (options == null) {
throw new NullPointerException("options");
}
this.options = new HashMap<String, Object>(options);
}
/**
* Returns the value of the option with the specified key. To retrieve
* the option value of a child {@link Channel}, prepend {@code "child."}
* to the option name (e.g. {@code "child.keepAlive"}).
*
* @param key the option name
*
* @return the option value if the option is found.
* {@code null} otherwise.
*/
public Object getOption(String key) {
if (key == null) {
throw new NullPointerException("key");
}
return options.get(key);
}
/**
* Sets an option with the specified key and value. If there's already
* an option with the same key, it is replaced with the new value. If the
* specified value is {@code null}, an existing option with the specified
* key is removed. To set the option value of a child {@link Channel},
* prepend {@code "child."} to the option name (e.g. {@code "child.keepAlive"}).
*
* @param key the option name
* @param value the option value
*/
public void setOption(String key, Object value) {
if (key == null) {
throw new NullPointerException("key");
}
if (value == null) {
options.remove(key);
} else {
options.put(key, value);
}
}
/**
* {@inheritDoc} This method simply delegates the call to
* {@link ChannelFactory#releaseExternalResources()}.
*/
@Override
public void releaseExternalResources() {
ChannelFactory factory = this.factory;
if (factory != null) {
factory.releaseExternalResources();
}
}
/**
* Returns {@code true} if and only if the specified {@code map} is an
* ordered map, like {@link LinkedHashMap} is.
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
static boolean isOrderedMap(Map<?, ?> map) {
Class<?> mapType = map.getClass();
if (LinkedHashMap.class.isAssignableFrom(mapType)) {
// LinkedHashMap is an ordered map.
return true;
}
// Not a LinkedHashMap - start autodetection.
// Detect Apache Commons Collections OrderedMap implementations.
Class<?> type = mapType;
while (type != null) {
for (Class<?> i: type.getInterfaces()) {
if (i.getName().endsWith("OrderedMap")) {
// Seems like it's an ordered map - guessed from that
// it implements OrderedMap interface.
return true;
}
}
type = type.getSuperclass();
}
// Does not implement OrderedMap interface. As a last resort, try to
// create a new instance and test if the insertion order is maintained.
Map newMap;
try {
newMap = (Map) mapType.newInstance();
} catch (Exception e) {
// No default constructor - cannot proceed anymore.
return false;
}
// Run some tests.
List<String> expectedKeys = new ArrayList<String>();
String dummyValue = "dummyValue";
for (short element: ORDER_TEST_SAMPLES) {
String key = String.valueOf(element);
newMap.put(key, dummyValue);
expectedKeys.add(key);
Iterator<String> it = expectedKeys.iterator();
for (Object actualKey: newMap.keySet()) {
if (!it.next().equals(actualKey)) {
// Did not pass the test.
return false;
}
}
}
// The specified map passed the insertion order test.
return true;
}
private static final short[] ORDER_TEST_SAMPLES = {
682, 807, 637, 358, 570, 828, 407, 319,
105, 41, 563, 544, 518, 298, 418, 50,
156, 769, 984, 503, 191, 578, 309, 710,
327, 720, 591, 939, 374, 707, 43, 463,
227, 174, 30, 531, 135, 930, 190, 823,
925, 835, 328, 239, 415, 500, 144, 460,
83, 774, 921, 4, 95, 468, 687, 493,
991, 436, 245, 742, 149, 821, 142, 782,
297, 918, 917, 424, 978, 992, 79, 906,
535, 515, 850, 80, 125, 378, 307, 883,
836, 160, 27, 630, 668, 226, 560, 698,
467, 829, 476, 163, 977, 367, 325, 184,
204, 312, 486, 53, 179, 592, 252, 750,
893, 517, 937, 124, 148, 719, 973, 566,
405, 449, 452, 777, 349, 761, 167, 783,
220, 802, 117, 604, 216, 363, 120, 621,
219, 182, 817, 244, 438, 465, 934, 888,
628, 209, 631, 17, 870, 679, 826, 945,
680, 848, 974, 573, 626, 865, 109, 317,
91, 494, 965, 473, 725, 388, 302, 936,
660, 150, 122, 949, 295, 392, 63, 634,
772, 143, 990, 895, 538, 59, 541, 32,
669, 321, 811, 756, 82, 955, 953, 636,
390, 162, 688, 444, 70, 590, 183, 745,
543, 666, 951, 642, 747, 765, 98, 469,
884, 929, 178, 721, 994, 840, 353, 726,
940, 759, 624, 919, 667, 629, 272, 979,
326, 608, 453, 11, 322, 347, 647, 354,
381, 746, 472, 890, 249, 536, 733, 404,
170, 959, 34, 899, 195, 651, 140, 856,
201, 237, 51, 933, 268, 849, 294, 115,
157, 14, 854, 373, 186, 872, 71, 523,
931, 952, 655, 561, 607, 862, 554, 661,
313, 909, 511, 752, 986, 311, 287, 775,
505, 878, 422, 103, 299, 119, 107, 344,
487, 776, 445, 218, 549, 697, 454, 6,
462, 455, 52, 481, 594, 126, 112, 66,
877, 172, 153, 912, 834, 741, 610, 915,
964, 831, 575, 714, 250, 461, 814, 913,
369, 542, 882, 851, 427, 838, 867, 507,
434, 569, 20, 950, 792, 605, 798, 962,
923, 258, 972, 762, 809, 843, 674, 448,
280, 495, 285, 822, 283, 147, 451, 993,
794, 982, 748, 189, 274, 96, 73, 810,
401, 261, 277, 346, 527, 645, 601, 868,
248, 879, 371, 428, 559, 278, 265, 62,
225, 853, 483, 771, 9, 8, 339, 653,
263, 28, 477, 995, 208, 880, 292, 480,
516, 457, 286, 897, 21, 852, 971, 658,
623, 528, 316, 471, 860, 306, 638, 711,
875, 671, 108, 158, 646, 24, 257, 724,
193, 341, 902, 599, 565, 334, 506, 684,
960, 780, 429, 801, 910, 308, 383, 901,
489, 81, 512, 164, 755, 514, 723, 141,
296, 958, 686, 15, 799, 579, 598, 558,
414, 64, 420, 730, 256, 131, 45, 129,
259, 338, 999, 175, 740, 790, 324, 985,
896, 482, 841, 606, 377, 111, 372, 699,
988, 233, 243, 203, 781, 969, 903, 662,
632, 301, 44, 981, 36, 412, 946, 816,
284, 447, 214, 672, 758, 954, 804, 2,
928, 886, 421, 596, 574, 16, 892, 68,
546, 522, 490, 873, 656, 696, 864, 130,
40, 393, 926, 394, 932, 876, 664, 293,
154, 916, 55, 196, 842, 498, 177, 948,
540, 127, 271, 113, 844, 576, 132, 943,
12, 123, 291, 31, 212, 529, 547, 171,
582, 609, 793, 830, 221, 440, 568, 118,
406, 194, 827, 360, 622, 389, 800, 571,
213, 262, 403, 408, 881, 289, 635, 967,
432, 376, 649, 832, 857, 717, 145, 510,
159, 980, 683, 580, 484, 379, 246, 88,
567, 320, 643, 7, 924, 397, 10, 787,
845, 779, 670, 716, 19, 600, 382, 0,
210, 665, 228, 97, 266, 90, 304, 456,
180, 152, 425, 310, 768, 223, 702, 997,
577, 663, 290, 537, 416, 426, 914, 691,
23, 281, 497, 508, 48, 681, 581, 728,
99, 795, 530, 871, 957, 889, 206, 813,
839, 709, 805, 253, 151, 613, 65, 654,
93, 639, 784, 891, 352, 67, 430, 754,
76, 187, 443, 676, 362, 961, 874, 330,
331, 384, 85, 217, 855, 818, 738, 361,
314, 3, 615, 520, 355, 920, 689, 22,
188, 49, 904, 935, 136, 475, 693, 749,
519, 812, 100, 207, 963, 364, 464, 572,
731, 230, 833, 385, 499, 545, 273, 232,
398, 478, 975, 564, 399, 504, 35, 562,
938, 211, 26, 337, 54, 614, 586, 433,
450, 763, 238, 305, 941, 370, 885, 837,
234, 110, 137, 395, 368, 695, 342, 907,
396, 474, 176, 737, 796, 446, 37, 894,
727, 648, 431, 1, 366, 525, 553, 704,
329, 627, 479, 33, 492, 260, 241, 86,
185, 491, 966, 247, 13, 587, 602, 409,
335, 650, 235, 611, 470, 442, 597, 254,
343, 539, 146, 585, 593, 641, 770, 94,
976, 705, 181, 255, 315, 718, 526, 987,
692, 983, 595, 898, 282, 133, 439, 633,
534, 861, 269, 619, 677, 502, 375, 224,
806, 869, 417, 584, 612, 803, 58, 84,
788, 797, 38, 700, 751, 603, 652, 57,
240, 947, 350, 270, 333, 116, 736, 69,
74, 104, 767, 318, 735, 859, 357, 555,
411, 267, 712, 675, 532, 825, 496, 927,
942, 102, 46, 192, 114, 744, 138, 998,
72, 617, 134, 846, 166, 77, 900, 5,
303, 387, 400, 47, 729, 922, 222, 197,
351, 509, 524, 165, 485, 300, 944, 380,
625, 778, 685, 29, 589, 766, 161, 391,
423, 42, 734, 552, 215, 824, 908, 229,
89, 251, 199, 616, 78, 644, 242, 722,
25, 437, 732, 956, 275, 200, 970, 753,
791, 336, 556, 847, 703, 236, 715, 75,
863, 713, 785, 911, 786, 620, 551, 413,
39, 739, 820, 808, 764, 701, 819, 173,
989, 345, 690, 459, 60, 106, 887, 996,
365, 673, 968, 513, 18, 419, 550, 588,
435, 264, 789, 340, 659, 466, 356, 288,
56, 708, 557, 488, 760, 332, 402, 168,
202, 521, 757, 205, 706, 441, 773, 231,
583, 386, 678, 618, 815, 279, 87, 533,
61, 548, 92, 169, 694, 905, 198, 121,
410, 139, 657, 640, 743, 128, 458, 866,
501, 348, 155, 276, 101, 858, 323, 359,
};
}