1 | package com.framsticks.util.dispatching; |
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2 | |
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3 | import java.util.AbstractCollection; |
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4 | import java.util.Collection; |
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5 | import java.util.Collections; |
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6 | import java.util.HashSet; |
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7 | import java.util.Iterator; |
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8 | import java.util.Set; |
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9 | |
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10 | import com.framsticks.params.ParamFlags; |
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11 | import com.framsticks.params.annotations.AutoAppendAnnotation; |
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12 | import com.framsticks.params.annotations.FramsClassAnnotation; |
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13 | import com.framsticks.params.annotations.ParamAnnotation; |
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14 | import com.framsticks.util.FramsticksException; |
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15 | import com.framsticks.util.Misc; |
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16 | |
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17 | |
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18 | @FramsClassAnnotation |
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19 | public class JoinableCollection<T extends Joinable> extends AbstractJoinable implements JoinableParent, Iterable<T> { |
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20 | |
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21 | protected final Set<T> joinables = new HashSet<T>(); |
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22 | |
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23 | public static enum FinishPolicy { |
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24 | Never, |
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25 | OnFirst, |
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26 | OnAll |
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27 | }; |
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28 | |
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29 | protected final FinishPolicy finishPolicy; |
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30 | |
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31 | protected String observableName; |
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32 | |
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33 | public JoinableCollection() { |
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34 | this(FinishPolicy.OnAll); |
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35 | } |
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36 | |
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37 | |
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38 | /** |
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39 | * @param finishPolicy |
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40 | */ |
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41 | public JoinableCollection(FinishPolicy finishPolicy) { |
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42 | this.finishPolicy = finishPolicy; |
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43 | } |
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44 | |
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45 | @AutoAppendAnnotation |
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46 | public synchronized void add(T joinable) { |
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47 | if (this.state.ordinal() > JoinableState.RUNNING.ordinal()) { |
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48 | throw new FramsticksException().msg("failed to add joinable - collection is passed running state").arg("joinable", joinable).arg("collection", this); |
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49 | } |
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50 | |
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51 | if (joinables.contains(joinable)) { |
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52 | throw new FramsticksException().msg("joinable is already observed").arg("joinable", joinable).arg("in", this); |
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53 | } |
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54 | joinables.add(joinable); |
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55 | |
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56 | if (this.state.equals(JoinableState.RUNNING)) { |
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57 | Dispatching.use(joinable, this); |
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58 | } |
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59 | } |
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60 | |
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61 | public synchronized void remove(T joinable) { |
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62 | if (this.state.ordinal() > JoinableState.RUNNING.ordinal()) { |
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63 | throw new FramsticksException().msg("failed to remote joinable - collection is passed running state").arg("joinable", joinable).arg("collection", this); |
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64 | } |
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65 | if (!joinables.contains(joinable)) { |
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66 | throw new FramsticksException().msg("joinable is not observed").arg("joinable", joinable).arg("in", this); |
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67 | } |
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68 | |
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69 | joinables.remove(joinable); |
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70 | |
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71 | if (this.state.equals(JoinableState.RUNNING)) { |
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72 | Dispatching.drop(joinable, this); |
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73 | } |
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74 | } |
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75 | |
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76 | @Override |
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77 | protected void joinableStart() { |
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78 | for (T j : joinables) { |
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79 | Dispatching.use(j, this); |
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80 | } |
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81 | } |
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82 | |
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83 | @Override |
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84 | protected void joinableInterrupt() { |
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85 | if (joinables.isEmpty()) { |
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86 | finishJoinable(); |
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87 | return; |
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88 | } |
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89 | |
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90 | for (T j : joinables) { |
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91 | Dispatching.drop(j, this); |
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92 | } |
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93 | } |
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94 | |
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95 | @Override |
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96 | protected void joinableFinish() { |
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97 | } |
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98 | |
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99 | @Override |
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100 | protected void joinableJoin() throws InterruptedException { |
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101 | for (T j : joinables) { |
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102 | Dispatching.join(j); |
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103 | } |
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104 | } |
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105 | |
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106 | protected JoinableState getNextState() { |
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107 | if ((finishPolicy == FinishPolicy.Never && state == JoinableState.RUNNING) || joinables.isEmpty()) { |
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108 | return state; |
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109 | } |
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110 | boolean oneIsEnough = (finishPolicy == FinishPolicy.OnFirst); |
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111 | JoinableState result = oneIsEnough ? JoinableState.INITILIAZED : JoinableState.JOINED; |
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112 | for (Joinable j : joinables) { |
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113 | JoinableState s = j.getState(); |
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114 | if (oneIsEnough) { |
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115 | if (s.ordinal() > result.ordinal()) { |
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116 | result = s; |
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117 | } |
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118 | } else { |
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119 | if (s.ordinal() < result.ordinal()) { |
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120 | result = s; |
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121 | } |
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122 | } |
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123 | } |
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124 | return result; |
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125 | } |
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126 | |
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127 | @Override |
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128 | public void childChangedState(Joinable joinable, JoinableState state) { |
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129 | proceedToState(getNextState()); |
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130 | } |
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131 | |
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132 | @Override |
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133 | public Iterator<T> iterator() { |
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134 | return Collections.unmodifiableSet(joinables).iterator(); |
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135 | } |
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136 | |
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137 | @Override |
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138 | public String toString() { |
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139 | return Misc.returnNotNull(observableName, "collection"); |
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140 | } |
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141 | |
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142 | /** |
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143 | * @param observableName the observableName to set |
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144 | */ |
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145 | public JoinableCollection<T> setObservableName(String observableName) { |
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146 | this.observableName = observableName; |
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147 | return this; |
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148 | } |
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149 | |
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150 | public T get(String name) { |
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151 | for (T j : joinables) { |
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152 | if (name.equals(j.getName())) { |
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153 | return j; |
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154 | } |
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155 | } |
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156 | return null; |
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157 | } |
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158 | |
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159 | public int size() { |
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160 | return joinables.size(); |
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161 | } |
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162 | |
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163 | public boolean contains(T joinable) { |
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164 | return joinables.contains(joinable); |
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165 | } |
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166 | |
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167 | @Override |
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168 | @ParamAnnotation |
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169 | public String getName() { |
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170 | return observableName; |
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171 | } |
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172 | |
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173 | @ParamAnnotation(flags = ParamFlags.USERREADONLY) |
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174 | public final void setName(String name) { |
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175 | observableName = name; |
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176 | } |
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177 | |
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178 | public Collection<T> asCollection() { |
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179 | return new AbstractCollection<T>() { |
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180 | |
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181 | @Override |
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182 | public Iterator<T> iterator() { |
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183 | return JoinableCollection.this.iterator(); |
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184 | } |
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185 | |
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186 | @Override |
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187 | public int size() { |
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188 | return JoinableCollection.this.size(); |
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189 | } |
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190 | |
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191 | @Override |
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192 | public boolean add(T joinable) { |
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193 | JoinableCollection.this.add(joinable); |
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194 | return true; |
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195 | } |
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196 | |
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197 | @SuppressWarnings("unchecked") |
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198 | @Override |
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199 | public boolean remove(Object joinable) { |
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200 | JoinableCollection.this.remove((T) joinable); |
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201 | return true; |
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202 | } |
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203 | }; |
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204 | } |
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205 | |
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206 | |
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207 | |
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208 | } |
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