Java大数据量（多线程）分段分批处理

分段处理主类

github地址：

https://github.com/zuojingang/common-tools-intergrated/blob/master/src/main/java/pers/zuo/component/piecewise/PiecewiseHandler.java

<https://github.com/zuojingang/common-tools-intergrated/blob/master/src/main/java/pers/zuo/component/piecewise/PiecewiseHandler.java>
package pers.zuo.component.piecewise; import java.util.ArrayList; import
java.util.List;import java.util.concurrent.Callable; import
java.util.concurrent.ExecutionException;import
java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;
import pers.zuo.component.piecewise.bean.PiecewiseKey; import
pers.zuo.component.piecewise.bean.PiecewiseResult;import
pers.zuo.component.piecewise.bean.PiecewiseTask;/** * @author zuojingang * *
@param <T> * the type of part process return */ public abstract class
PiecewiseHandler<V> { public void nThreads( final Map<PiecewiseKey,
PiecewiseResult<Map<PiecewiseKey, PiecewiseResult<V>>>> nThreadResult,final int
totalNum)throws Exception { nThreads(nThreadResult, totalNum, D_THREAD_SIZE,
D_PART_SIZE); }/** * @param totalNum * @param threadSize * @return nThreads
process result. */ public void nThreads( final Map<PiecewiseKey,
PiecewiseResult<Map<PiecewiseKey, PiecewiseResult<V>>>> nThreadResult,final int
totalNum,final int threadSize, final int partSize) throws Exception { if (null
== nThreadResult ||0 >= totalNum || 0 >= threadSize) { return; }
ExecutorService fixThreadPool = Executors.newFixedThreadPool(D_N_THREAD);
List<PiecewiseTask> fTaskList =new ArrayList<>(); int fromIndex = 0; try { while
(totalNum > fromIndex) {final int thisFromIndex = fromIndex; final int
threadProcessNum = Math.min(totalNum - fromIndex, threadSize);final int
thisToIndex = thisFromIndex + threadProcessNum;if (0 < threadProcessNum) {
PiecewiseTask futureTask = PiecewiseBuilder.buildTask(new Callable<Boolean>() {
@Override public Boolean call() throws Exception { final Map<PiecewiseKey,
PiecewiseResult<V>> threadResult = PiecewiseBuilder .initializeThreadResult();
nThreadResult.put(PiecewiseBuilder.buildKey(thisFromIndex, thisToIndex),
PiecewiseBuilder.buildResult(threadResult)); singleThread(threadResult,
thisFromIndex, threadProcessNum, partSize);return true; } },
PiecewiseBuilder.buildKey(thisFromIndex, thisToIndex));
fixThreadPool.submit(futureTask); fTaskList.add(futureTask); } fromIndex +=
threadProcessNum; } boolean finished =true; for (PiecewiseTask futureTask :
fTaskList) {try { finished = finished && futureTask.get(); } catch
(InterruptedException | ExecutionException e) {
nThreadResult.get(futureTask.getTaskKey()).setException(e); } } }catch
(Exception e) {throw e; } finally { // the threadPool must manual-lock after use
fixThreadPool.shutdown(); } } public void singleThread(final Map<PiecewiseKey,
PiecewiseResult<V>> threadResult,final int totalNum) {
singleThread(threadResult,0, totalNum); } public void singleThread(final
Map<PiecewiseKey, PiecewiseResult<V>> threadResult,final int offset, final int
totalNum) { singleThread(threadResult, offset, totalNum, D_PART_SIZE); }/** *
@param offset * @param toIndex * @param partSize * @return process subList
values and include first index(offset) and exclude * latest index(offset +
totalNum) */ public void singleThread(final Map<PiecewiseKey,
PiecewiseResult<V>> threadResult,final int offset, final int totalNum, final
int partSize) {if (0 >= totalNum || 0 >= partSize) { return; } final int
toIndex = offset + totalNum; int fromIndex = offset;while (toIndex > fromIndex)
{ int thisToIndex = Math.min(fromIndex + partSize, toIndex); V partResult =null
; Exception pe =null; try { partResult = partProcess(fromIndex, thisToIndex); }
catch (Exception e) { pe = e; }
threadResult.put(PiecewiseBuilder.buildKey(fromIndex, thisToIndex),
PiecewiseBuilder.buildResult(partResult, pe)); fromIndex = thisToIndex; } }/** *
@param offset * @param partSize * @return part process result */ protected
abstract V partProcess(final int fromIndex, final int toIndex) throws
Exception; public staticfinal int D_N_THREAD = 10; public static final int
D_THREAD_SIZE =10000; public static final int D_PART_SIZE = 1000; }
分段任务定制类
package pers.zuo.component.piecewise.bean; import java.util.ArrayList; import
java.util.List;import java.util.concurrent.Callable; import
java.util.concurrent.FutureTask;/** * @author zuojingang * * @param <K *
extends Number> the type of part process return */ public class PiecewiseTask
extends FutureTask<Boolean> { private final PiecewiseKey taskKey; public
PiecewiseTask(Callable<Boolean> callable, PiecewiseKey taskKey) {super
(callable);this.taskKey = taskKey; } public PiecewiseKey getTaskKey() { return
taskKey; } }
分段任务Key值类
package pers.zuo.component.piecewise.bean; public class PiecewiseKey { private
final Integerfrom; private final Integer to; public PiecewiseKey(Integer from,
Integer to) { super();this.from = from; this.to = to; } public Integer getFrom
() {return from; } public Integer getTo() { return to; } @Override public int
hashCode() { final int prime = 31; int result = 1; result = prime * result + ((
from == null) ? 0 : from.hashCode()); result = prime * result + ((to == null) ?
0 : to.hashCode()); return result; } @Override public boolean equals(Object
obj) {if (this == obj) return true; if (obj == null) return false; if
(getClass() != obj.getClass())return false; PiecewiseKey other = (PiecewiseKey)
obj;if (from == null) { if (other.from != null) return false; } else if (!from
.equals(other.from)) return false; if (to == null) { if (other.to != null)
return false; } else if (!to.equals(other.to)) return false; return true; } }
分段任务返回值类
package pers.zuo.component.piecewise.bean; public class PiecewiseResult<V> {
private final V val; private Exception exception; public PiecewiseResult(V val)
{ super();this.val = val; } public PiecewiseResult(V val, Exception exception)
{ super();this.val = val; this.exception = exception; } public Exception
getException() { return exception; } public void setException(Exception
exception) {this.exception = exception; } public V getVal() { return val; } }
获取实例工具类
package pers.zuo.component.piecewise.manager; import java.util.HashMap; import
java.util.Map;import java.util.concurrent.Callable; import
pers.zuo.component.piecewise.bean.PiecewiseKey;import
pers.zuo.component.piecewise.bean.PiecewiseResult;import
pers.zuo.component.piecewise.bean.PiecewiseTask;public class PiecewiseBuilder {
public static PiecewiseKey buildKey(Integer from, Integer to) { return new
PiecewiseKey(from, to); }public static <V> PiecewiseResult<V> buildResult(V
val) {return new PiecewiseResult<V>(val); } public static <V> PiecewiseResult<V>
buildResult(V val, Exception exception) { return new PiecewiseResult<V>(val,
exception); }public static PiecewiseTask buildTask(Callable<Boolean> callable,
PiecewiseKey taskKey) {return new PiecewiseTask(callable, taskKey); } /** *
this method aimed for simple when define the nThreadResult * * @return */ public
static <V> Map<PiecewiseKey, PiecewiseResult<Map<PiecewiseKey,
PiecewiseResult<V>>>>initializeNThreadResult() { return new HashMap<>(); } /**
* this method aimed for simple when define the threadResult * * @return */
public static <V> Map<PiecewiseKey, PiecewiseResult<V>> initializeThreadResult
() {return new HashMap<>(); } }

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