| 1 | package com.hammurapi.eventbus.local; |
| 2 | |
| 3 | import java.util.ArrayList; |
| 4 | import java.util.Arrays; |
| 5 | import java.util.List; |
| 6 | |
| 7 | import com.hammurapi.eventbus.AbstractEventBus; |
| 8 | import com.hammurapi.eventbus.AbstractEventBus.Handle; |
| 9 | import com.hammurapi.eventbus.Derivation; |
| 10 | import com.hammurapi.eventbus.EventHandler; |
| 11 | import com.hammurapi.eventbus.EventStore; |
| 12 | import com.hammurapi.eventbus.InferenceContext; |
| 13 | import com.hammurapi.store.local.LocalHandle.HandleStrength; |
| 14 | |
| 15 | class DerivationImpl<E, P extends Comparable<P>, C, S extends EventStore<E, P, C, AbstractEventBus.Handle<E, P, C, Long>, S>> implements Derivation<E,P,C>, AbstractEventBus.DerivationEx<Long>, Comparable<DerivationImpl<E,P,C,S>> { |
| 16 | |
| 17 | final Long handlerId; |
| 18 | final EventHandler<E, P, C, ?, ?> handler; |
| 19 | final FacadeHandle<E,P,C,S>[] handles; |
| 20 | final long timestamp = System.currentTimeMillis(); |
| 21 | final List<E> events = new ArrayList<E>(); |
| 22 | |
| 23 | public DerivationImpl(Long handlerId, EventHandler<E, P, C, ?, ?> handler, AbstractEventBus.Handle<E,P,C,Long>[] inputs) { |
| 24 | this.handlerId = handlerId; |
| 25 | this.handler = handler; |
| 26 | this.handles = new FacadeHandle[inputs.length]; |
| 27 | for (int i=0; i<handles.length; ++i) { |
| 28 | if (inputs[i] instanceof FacadeHandle) { |
| 29 | handles[i] = (FacadeHandle<E, P, C, S>) inputs[i]; |
| 30 | } else { |
| 31 | handles[i]= new FacadeHandle<E,P,C,S>((MasterHandle<E, P, C, S>) inputs[i], HandleStrength.STRONG); |
| 32 | } |
| 33 | } |
| 34 | |
| 35 | for (int i=0; i<handles.length; ++i) { |
| 36 | handles[i].addDerivative(this); |
| 37 | this.events.add(inputs[i].getEvent()); |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | @Override |
| 42 | public EventHandler<E, P, C, ?, ?> getHandler() { |
| 43 | return handler; |
| 44 | } |
| 45 | |
| 46 | @Override |
| 47 | public List<E> getInputs() { |
| 48 | return events; |
| 49 | } |
| 50 | |
| 51 | @Override |
| 52 | public boolean isDerivedFrom(E sourceEvent) { |
| 53 | for (Handle<E,P,C,Long> h: handles) { |
| 54 | if (h.isValid()) { |
| 55 | if (sourceEvent.equals(h.getEvent())) { |
| 56 | return true; |
| 57 | } |
| 58 | if (h.isDerivedFrom(sourceEvent)) { |
| 59 | return true; |
| 60 | } |
| 61 | } |
| 62 | } |
| 63 | return false; |
| 64 | } |
| 65 | |
| 66 | @Override |
| 67 | public long timestamp() { |
| 68 | return timestamp; |
| 69 | } |
| 70 | |
| 71 | @Override |
| 72 | public String toString() { |
| 73 | return "DerivationImpl [handlerId=" + handlerId + ", handler=" |
| 74 | + handler + ", handles=" + Arrays.toString(handles) |
| 75 | + ", inputs=" + events + ", timestamp=" + timestamp + "]"; |
| 76 | } |
| 77 | |
| 78 | @Override |
| 79 | public Long getHandlerId() { |
| 80 | return handlerId; |
| 81 | } |
| 82 | |
| 83 | @Override |
| 84 | public List<Long> getInputIds() { |
| 85 | List<Long> ret = new ArrayList<Long>(handles.length); |
| 86 | for (Handle<E,P,C,Long> h: handles) { |
| 87 | ret.add(h.getId()); |
| 88 | } |
| 89 | return ret; |
| 90 | } |
| 91 | |
| 92 | @Override |
| 93 | public int hashCode() { |
| 94 | final int prime = 31; |
| 95 | int result = 1; |
| 96 | result = prime * result |
| 97 | + ((handlerId == null) ? 0 : handlerId.hashCode()); |
| 98 | result = prime * result + ((events == null) ? 0 : events.hashCode()); |
| 99 | return result; |
| 100 | } |
| 101 | |
| 102 | @Override |
| 103 | public boolean equals(Object obj) { |
| 104 | if (this == obj) |
| 105 | return true; |
| 106 | if (obj == null) |
| 107 | return false; |
| 108 | if (getClass() != obj.getClass()) |
| 109 | return false; |
| 110 | DerivationImpl other = (DerivationImpl) obj; |
| 111 | if (handlerId == null) { |
| 112 | if (other.handlerId != null) |
| 113 | return false; |
| 114 | } else if (!handlerId.equals(other.handlerId)) |
| 115 | return false; |
| 116 | if (events == null) { |
| 117 | if (other.events != null) |
| 118 | return false; |
| 119 | } else if (!events.equals(other.events)) |
| 120 | return false; |
| 121 | return true; |
| 122 | } |
| 123 | |
| 124 | private MasterHandle<E,P,C,?> masterHandle; |
| 125 | |
| 126 | @Override |
| 127 | public void invalidate(InferenceContext<E,P,C,?,?,?> inferenceContext) { |
| 128 | if (masterHandle!=null) { |
| 129 | masterHandle.removeDerivation(this, (InferenceContext) inferenceContext); |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | void setMasterHandle(MasterHandle<E, P, C, S> masterHandle) { |
| 134 | this.masterHandle = masterHandle; |
| 135 | } |
| 136 | |
| 137 | // In order to be able to put to concurrent skip list |
| 138 | @Override |
| 139 | public int compareTo(DerivationImpl<E, P, C, S> o) { |
| 140 | if (o==this) { |
| 141 | return 0; |
| 142 | } |
| 143 | long hDelta = handlerId - o.handlerId; |
| 144 | if (hDelta>0) { |
| 145 | return 1; |
| 146 | } |
| 147 | if (hDelta<0) { |
| 148 | return -1; |
| 149 | } |
| 150 | |
| 151 | for (int i=0; i<handles.length; ++i) { |
| 152 | long d = handles[i].getId()-o.handles[i].getId(); |
| 153 | if (d>0) { |
| 154 | return 1; |
| 155 | } |
| 156 | if (d<0) { |
| 157 | return -1; |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | } |