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Usually it is only a<a name="line.104"></a> +<span class="sourceLineNo">105</span> * one line lambda expression, like:<a name="line.105"></a> +<span class="sourceLineNo">106</span> *<a name="line.106"></a> +<span class="sourceLineNo">107</span> * <pre><a name="line.107"></a> +<span class="sourceLineNo">108</span> * <code><a name="line.108"></a> +<span class="sourceLineNo">109</span> * channel -> xxxService.newStub(channel)<a name="line.109"></a> +<span class="sourceLineNo">110</span> * </code><a name="line.110"></a> +<span class="sourceLineNo">111</span> * </pre><a name="line.111"></a> +<span class="sourceLineNo">112</span> *<a name="line.112"></a> +<span class="sourceLineNo">113</span> * @param stubMaker a delegation to the actual {@code newStub} call.<a name="line.113"></a> +<span class="sourceLineNo">114</span> * @param callable a delegation to the actual protobuf rpc call. See the comment of<a name="line.114"></a> +<span class="sourceLineNo">115</span> * {@link CoprocessorCallable} for more details.<a name="line.115"></a> +<span class="sourceLineNo">116</span> * @param row The row key used to identify the remote region location<a name="line.116"></a> +<span class="sourceLineNo">117</span> * @param <S> the type of the asynchronous stub<a name="line.117"></a> +<span class="sourceLineNo">118</span> * @param <R> the type of the return value<a name="line.118"></a> +<span class="sourceLineNo">119</span> * @return the return value of the protobuf rpc call, wrapped by a {@link CompletableFuture}.<a name="line.119"></a> +<span class="sourceLineNo">120</span> * @see CoprocessorCallable<a name="line.120"></a> +<span class="sourceLineNo">121</span> */<a name="line.121"></a> +<span class="sourceLineNo">122</span> <S, R> CompletableFuture<R> coprocessorService(Function<RpcChannel, S> stubMaker,<a name="line.122"></a> +<span class="sourceLineNo">123</span> CoprocessorCallable<S, R> callable, byte[] row);<a name="line.123"></a> +<span class="sourceLineNo">124</span><a name="line.124"></a> +<span class="sourceLineNo">125</span> /**<a name="line.125"></a> +<span class="sourceLineNo">126</span> * The callback when we want to execute a coprocessor call on a range of regions.<a name="line.126"></a> +<span class="sourceLineNo">127</span> * <p><a name="line.127"></a> +<span class="sourceLineNo">128</span> * As the locating itself also takes some time, the implementation may want to send rpc calls on<a name="line.128"></a> +<span class="sourceLineNo">129</span> * the fly, which means we do not know how many regions we have when we get the return value of<a name="line.129"></a> +<span class="sourceLineNo">130</span> * the rpc calls, so we need an {@link #onComplete()} which is used to tell you that we have<a name="line.130"></a> +<span class="sourceLineNo">131</span> * passed all the return values to you(through the {@link #onRegionComplete(RegionInfo, Object)}<a name="line.131"></a> +<span class="sourceLineNo">132</span> * or {@link #onRegionError(RegionInfo, Throwable)} calls), i.e, there will be no<a name="line.132"></a> +<span class="sourceLineNo">133</span> * {@link #onRegionComplete(RegionInfo, Object)} or {@link #onRegionError(RegionInfo, Throwable)}<a name="line.133"></a> +<span class="sourceLineNo">134</span> * calls in the future.<a name="line.134"></a> +<span class="sourceLineNo">135</span> * <p><a name="line.135"></a> +<span class="sourceLineNo">136</span> * Here is a pseudo code to describe a typical implementation of a range coprocessor service<a name="line.136"></a> +<span class="sourceLineNo">137</span> * method to help you better understand how the {@link CoprocessorCallback} will be called. The<a name="line.137"></a> +<span class="sourceLineNo">138</span> * {@code callback} in the pseudo code is our {@link CoprocessorCallback}. And notice that the<a name="line.138"></a> +<span class="sourceLineNo">139</span> * {@code whenComplete} is {@code CompletableFuture.whenComplete}.<a name="line.139"></a> +<span class="sourceLineNo">140</span> *<a name="line.140"></a> +<span class="sourceLineNo">141</span> * <pre><a name="line.141"></a> +<span class="sourceLineNo">142</span> * locateThenCall(byte[] row) {<a name="line.142"></a> +<span class="sourceLineNo">143</span> * locate(row).whenComplete((location, locateError) -> {<a name="line.143"></a> +<span class="sourceLineNo">144</span> * if (locateError != null) {<a name="line.144"></a> +<span class="sourceLineNo">145</span> * callback.onError(locateError);<a name="line.145"></a> +<span class="sourceLineNo">146</span> * return;<a name="line.146"></a> +<span class="sourceLineNo">147</span> * }<a name="line.147"></a> +<span class="sourceLineNo">148</span> * incPendingCall();<a name="line.148"></a> +<span class="sourceLineNo">149</span> * region = location.getRegion();<a name="line.149"></a> +<span class="sourceLineNo">150</span> * if (region.getEndKey() > endKey) {<a name="line.150"></a> +<span class="sourceLineNo">151</span> * locateEnd = true;<a name="line.151"></a> +<span class="sourceLineNo">152</span> * } else {<a name="line.152"></a> +<span class="sourceLineNo">153</span> * locateThenCall(region.getEndKey());<a name="line.153"></a> +<span class="sourceLineNo">154</span> * }<a name="line.154"></a> +<span class="sourceLineNo">155</span> * sendCall().whenComplete((resp, error) -> {<a name="line.155"></a> +<span class="sourceLineNo">156</span> * if (error != null) {<a name="line.156"></a> +<span class="sourceLineNo">157</span> * callback.onRegionError(region, error);<a name="line.157"></a> +<span class="sourceLineNo">158</span> * } else {<a name="line.158"></a> +<span class="sourceLineNo">159</span> * callback.onRegionComplete(region, resp);<a name="line.159"></a> +<span class="sourceLineNo">160</span> * }<a name="line.160"></a> +<span class="sourceLineNo">161</span> * if (locateEnd && decPendingCallAndGet() == 0) {<a name="line.161"></a> +<span class="sourceLineNo">162</span> * callback.onComplete();<a name="line.162"></a> +<span class="sourceLineNo">163</span> * }<a name="line.163"></a> +<span class="sourceLineNo">164</span> * });<a name="line.164"></a> +<span class="sourceLineNo">165</span> * });<a name="line.165"></a> +<span class="sourceLineNo">166</span> * }<a name="line.166"></a> +<span class="sourceLineNo">167</span> * </pre><a name="line.167"></a> +<span class="sourceLineNo">168</span> */<a name="line.168"></a> +<span class="sourceLineNo">169</span> @InterfaceAudience.Public<a name="line.169"></a> +<span class="sourceLineNo">170</span> interface CoprocessorCallback<R> {<a name="line.170"></a> +<span class="sourceLineNo">171</span><a name="line.171"></a> +<span class="sourceLineNo">172</span> /**<a name="line.172"></a> +<span class="sourceLineNo">173</span> * @param region the region that the response belongs to<a name="line.173"></a> +<span class="sourceLineNo">174</span> * @param resp the response of the coprocessor call<a name="line.174"></a> +<span class="sourceLineNo">175</span> */<a name="line.175"></a> +<span class="sourceLineNo">176</span> void onRegionComplete(RegionInfo region, R resp);<a name="line.176"></a> +<span class="sourceLineNo">177</span><a name="line.177"></a> +<span class="sourceLineNo">178</span> /**<a name="line.178"></a> +<span class="sourceLineNo">179</span> * @param region the region that the error belongs to<a name="line.179"></a> +<span class="sourceLineNo">180</span> * @param error the response error of the coprocessor call<a name="line.180"></a> +<span class="sourceLineNo">181</span> */<a name="line.181"></a> +<span class="sourceLineNo">182</span> void onRegionError(RegionInfo region, Throwable error);<a name="line.182"></a> +<span class="sourceLineNo">183</span><a name="line.183"></a> +<span class="sourceLineNo">184</span> /**<a name="line.184"></a> +<span class="sourceLineNo">185</span> * Indicate that all responses of the regions have been notified by calling<a name="line.185"></a> +<span class="sourceLineNo">186</span> * {@link #onRegionComplete(RegionInfo, Object)} or<a name="line.186"></a> +<span class="sourceLineNo">187</span> * {@link #onRegionError(RegionInfo, Throwable)}.<a name="line.187"></a> +<span class="sourceLineNo">188</span> */<a name="line.188"></a> +<span class="sourceLineNo">189</span> void onComplete();<a name="line.189"></a> +<span class="sourceLineNo">190</span><a name="line.190"></a> +<span class="sourceLineNo">191</span> /**<a name="line.191"></a> +<span class="sourceLineNo">192</span> * Indicate that we got an error which does not belong to any regions. Usually a locating error.<a name="line.192"></a> <span class="sourceLineNo">193</span> */<a name="line.193"></a> -<span class="sourceLineNo">194</span> void onComplete();<a name="line.194"></a> -<span class="sourceLineNo">195</span><a name="line.195"></a> -<span class="sourceLineNo">196</span> /**<a name="line.196"></a> -<span class="sourceLineNo">197</span> * Indicate that we got an error which does not belong to any regions. Usually a locating error.<a name="line.197"></a> -<span class="sourceLineNo">198</span> */<a name="line.198"></a> -<span class="sourceLineNo">199</span> void onError(Throwable error);<a name="line.199"></a> -<span class="sourceLineNo">200</span> }<a name="line.200"></a> -<span class="sourceLineNo">201</span><a name="line.201"></a> -<span class="sourceLineNo">202</span> /**<a name="line.202"></a> -<span class="sourceLineNo">203</span> * Execute the given coprocessor call on the regions which are covered by the range from<a name="line.203"></a> -<span class="sourceLineNo">204</span> * {@code startKey} inclusive and {@code endKey} exclusive. See the comment of<a name="line.204"></a> -<span class="sourceLineNo">205</span> * {@link #coprocessorService(Function, CoprocessorCallable, byte[], boolean, byte[], boolean, CoprocessorCallback)}<a name="line.205"></a> -<span class="sourceLineNo">206</span> * for more details.<a name="line.206"></a> -<span class="sourceLineNo">207</span> * @see #coprocessorService(Function, CoprocessorCallable, byte[], boolean, byte[], boolean,<a name="line.207"></a> -<span class="sourceLineNo">208</span> * CoprocessorCallback)<a name="line.208"></a> -<span class="sourceLineNo">209</span> */<a name="line.209"></a> -<span class="sourceLineNo">210</span> default <S, R> void coprocessorService(Function<RpcChannel, S> stubMaker,<a name="line.210"></a> -<span class="sourceLineNo">211</span> CoprocessorCallable<S, R> callable, byte[] startKey, byte[] endKey,<a name="line.211"></a> -<span class="sourceLineNo">212</span> CoprocessorCallback<R> callback) {<a name="line.212"></a> -<span class="sourceLineNo">213</span> coprocessorService(stubMaker, callable, startKey, true, endKey, false, callback);<a name="line.213"></a> -<span class="sourceLineNo">214</span> }<a name="line.214"></a> -<span class="sourceLineNo">215</span><a name="line.215"></a> -<span class="sourceLineNo">216</span> /**<a name="line.216"></a> -<span class="sourceLineNo">217</span> * Execute the given coprocessor call on the regions which are covered by the range from<a name="line.217"></a> -<span class="sourceLineNo">218</span> * {@code startKey} and {@code endKey}. The inclusive of boundaries are specified by<a name="line.218"></a> -<span class="sourceLineNo">219</span> * {@code startKeyInclusive} and {@code endKeyInclusive}. The {@code stubMaker} is just a<a name="line.219"></a> -<span class="sourceLineNo">220</span> * delegation to the {@code xxxService.newStub} call. Usually it is only a one line lambda<a name="line.220"></a> -<span class="sourceLineNo">221</span> * expression, like:<a name="line.221"></a> -<span class="sourceLineNo">222</span> *<a name="line.222"></a> -<span class="sourceLineNo">223</span> * <pre><a name="line.223"></a> -<span class="sourceLineNo">224</span> * <code><a name="line.224"></a> -<span class="sourceLineNo">225</span> * channel -> xxxService.newStub(channel)<a name="line.225"></a> -<span class="sourceLineNo">226</span> * </code><a name="line.226"></a> -<span class="sourceLineNo">227</span> * </pre><a name="line.227"></a> -<span class="sourceLineNo">228</span> *<a name="line.228"></a> -<span class="sourceLineNo">229</span> * @param stubMaker a delegation to the actual {@code newStub} call.<a name="line.229"></a> -<span class="sourceLineNo">230</span> * @param callable a delegation to the actual protobuf rpc call. See the comment of<a name="line.230"></a> -<span class="sourceLineNo">231</span> * {@link CoprocessorCallable} for more details.<a name="line.231"></a> -<span class="sourceLineNo">232</span> * @param startKey start region selection with region containing this row. If {@code null}, the<a name="line.232"></a> -<span class="sourceLineNo">233</span> * selection will start with the first table region.<a name="line.233"></a> -<span class="sourceLineNo">234</span> * @param startKeyInclusive whether to include the startKey<a name="line.234"></a> -<span class="sourceLineNo">235</span> * @param endKey select regions up to and including the region containing this row. If<a name="line.235"></a> -<span class="sourceLineNo">236</span> * {@code null}, selection will continue through the last table region.<a name="line.236"></a> -<span class="sourceLineNo">237</span> * @param endKeyInclusive whether to include the endKey<a name="line.237"></a> -<span class="sourceLineNo">238</span> * @param callback callback to get the response. See the comment of {@link CoprocessorCallback}<a name="line.238"></a> -<span class="sourceLineNo">239</span> * for more details.<a name="line.239"></a> -<span class="sourceLineNo">240</span> * @param <S> the type of the asynchronous stub<a name="line.240"></a> -<span class="sourceLineNo">241</span> * @param <R> the type of the return value<a name="line.241"></a> -<span class="sourceLineNo">242</span> * @see CoprocessorCallable<a name="line.242"></a> -<span class="sourceLineNo">243</span> * @see CoprocessorCallback<a name="line.243"></a> -<span class="sourceLineNo">244</span> */<a name="line.244"></a> -<span class="sourceLineNo">245</span> <S, R> void coprocessorService(Function<RpcChannel, S> stubMaker,<a name="line.245"></a> -<span class="sourceLineNo">246</span> CoprocessorCallable<S, R> callable, byte[] startKey, boolean startKeyInclusive, byte[] endKey,<a name="line.246"></a> -<span class="sourceLineNo">247</span> boolean endKeyInclusive, CoprocessorCallback<R> callback);<a name="line.247"></a> -<span class="sourceLineNo">248</span>}<a name="line.248"></a> +<span class="sourceLineNo">194</span> void onError(Throwable error);<a name="line.194"></a> +<span class="sourceLineNo">195</span> }<a name="line.195"></a> +<span class="sourceLineNo">196</span><a name="line.196"></a> +<span class="sourceLineNo">197</span> /**<a name="line.197"></a> +<span class="sourceLineNo">198</span> * Helper class for sending coprocessorService request that executes a coprocessor call on regions<a name="line.198"></a> +<span class="sourceLineNo">199</span> * which are covered by a range.<a name="line.199"></a> +<span class="sourceLineNo">200</span> * <p><a name="line.200"></a> +<span class="sourceLineNo">201</span> * If {@code fromRow} is not specified the selection will start with the first table region. If<a name="line.201"></a> +<span class="sourceLineNo">202</span> * {@code toRow} is not specified the selection will continue through the last table region.<a name="line.202"></a> +<span class="sourceLineNo">203</span> * @param <S> the type of the protobuf Service you want to call.<a name="line.203"></a> +<span class="sourceLineNo">204</span> * @param <R> the type of the return value.<a name="line.204"></a> +<span class="sourceLineNo">205</span> */<a name="line.205"></a> +<span class="sourceLineNo">206</span> interface CoprocessorServiceBuilder<S, R> {<a name="line.206"></a> +<span class="sourceLineNo">207</span><a name="line.207"></a> +<span class="sourceLineNo">208</span> /**<a name="line.208"></a> +<span class="sourceLineNo">209</span> * @param startKey start region selection with region containing this row, inclusive.<a name="line.209"></a> +<span class="sourceLineNo">210</span> */<a name="line.210"></a> +<span class="sourceLineNo">211</span> default CoprocessorServiceBuilder<S, R> fromRow(byte[] startKey) {<a name="line.211"></a> +<span class="sourceLineNo">212</span> return fromRow(startKey, true);<a name="line.212"></a> +<span class="sourceLineNo">213</span> }<a name="line.213"></a> +<span class="sourceLineNo">214</span><a name="line.214"></a> +<span class="sourceLineNo">215</span> /**<a name="line.215"></a> +<span class="sourceLineNo">216</span> * @param startKey start region selection with region containing this row<a name="line.216"></a> +<span class="sourceLineNo">217</span> * @param inclusive whether to include the startKey<a name="line.217"></a> +<span class="sourceLineNo">218</span> */<a name="line.218"></a> +<span class="sourceLineNo">219</span> CoprocessorServiceBuilder<S, R> fromRow(byte[] startKey, boolean inclusive);<a name="line.219"></a> +<span class="sourceLineNo">220</span><a name="line.220"></a> +<span class="sourceLineNo">221</span> /**<a name="line.221"></a> +<span class="sourceLineNo">222</span> * @param endKey select regions up to and including the region containing this row, exclusive.<a name="line.222"></a> +<span class="sourceLineNo">223</span> */<a name="line.223"></a> +<span class="sourceLineNo">224</span> default CoprocessorServiceBuilder<S, R> toRow(byte[] endKey) {<a name="line.224"></a> +<span class="sourceLineNo">225</span> return toRow(endKey, false);<a name="line.225"></a> +<span class="sourceLineNo">226</span> }<a name="line.226"></a> +<span class="sourceLineNo">227</span><a name="line.227"></a> +<span class="sourceLineNo">228</span> /**<a name="line.228"></a> +<span class="sourceLineNo">229</span> * @param endKey select regions up to and including the region containing this row<a name="line.229"></a> +<span class="sourceLineNo">230</span> * @param inclusive whether to include the endKey<a name="line.230"></a> +<span class="sourceLineNo">231</span> */<a name="line.231"></a> +<span class="sourceLineNo">232</span> CoprocessorServiceBuilder<S, R> toRow(byte[] endKey, boolean inclusive);<a name="line.232"></a> +<span class="sourceLineNo">233</span><a name="line.233"></a> +<span class="sourceLineNo">234</span> /**<a name="line.234"></a> +<span class="sourceLineNo">235</span> * Execute the coprocessorService request. You can get the response through the<a name="line.235"></a> +<span class="sourceLineNo">236</span> * {@link CoprocessorCallback}.<a name="line.236"></a> +<span class="sourceLineNo">237</span> */<a name="line.237"></a> +<span class="sourceLineNo">238</span> void execute();<a name="line.238"></a> +<span class="sourceLineNo">239</span> }<a name="line.239"></a> +<span class="sourceLineNo">240</span><a name="line.240"></a> +<span class="sourceLineNo">241</span> /**<a name="line.241"></a> +<span class="sourceLineNo">242</span> * Execute a coprocessor call on the regions which are covered by a range.<a name="line.242"></a> +<span class="sourceLineNo">243</span> * <p><a name="line.243"></a> +<span class="sourceLineNo">244</span> * Use the returned {@link CoprocessorServiceBuilder} construct your request and then execute it.<a name="line.244"></a> +<span class="sourceLineNo">245</span> * <p><a name="line.245"></a> +<span class="sourceLineNo">246</span> * The {@code stubMaker} is just a delegation to the {@code xxxService.newStub} call. Usually it<a name="line.246"></a> +<span class="sourceLineNo">247</span> * is only a one line lambda expression, like:<a name="line.247"></a> +<span class="sourceLineNo">248</span> *<a name="line.248"></a> +<span class="sourceLineNo">249</span> * <pre><a name="line.249"></a> +<span class="sourceLineNo">250</span> * <code><a name="line.250"></a> +<span class="sourceLineNo">251</span> * channel -> xxxService.newStub(channel)<a name="line.251"></a> +<span class="sourceLineNo">252</span> * </code><a name="line.252"></a> +<span class="sourceLineNo">253</span> * </pre><a name="line.253"></a> +<span class="sourceLineNo">254</span> *<a name="line.254"></a> +<span class="sourceLineNo">255</span> * @param stubMaker a delegation to the actual {@code newStub} call.<a name="line.255"></a> +<span class="sourceLineNo">256</span> * @param callable a delegation to the actual protobuf rpc call. See the comment of<a name="line.256"></a> +<span class="sourceLineNo">257</span> * {@link CoprocessorCallable} for more details.<a name="line.257"></a> +<span class="sourceLineNo">258</span> * @param callback callback to get the response. See the comment of {@link CoprocessorCallback}<a name="line.258"></a> +<span class="sourceLineNo">259</span> * for more details.<a name="line.259"></a> +<span class="sourceLineNo">260</span> */<a name="line.260"></a> +<span class="sourceLineNo">261</span> <S, R> CoprocessorServiceBuilder<S, R> coprocessorService(Function<RpcChannel, S> stubMaker,<a name="line.261"></a> +<span class="sourceLineNo">262</span> CoprocessorCallable<S, R> callable, CoprocessorCallback<R> callback);<a name="line.262"></a> +<span class="sourceLineNo">263</span>}<a name="line.263"></a>
