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package org.apache.camel.processor; |
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import java.io.Serializable; |
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import java.util.Random; |
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public class RedeliveryPolicy implements Cloneable, Serializable { |
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protected static transient Random randomNumberGenerator; |
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protected int maximumRedeliveries = 6; |
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protected long initialRedeliveryDelay = 1000L; |
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protected double backOffMultiplier = 2; |
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protected boolean useExponentialBackOff; |
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protected double collisionAvoidanceFactor = 0.15d; |
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protected boolean useCollisionAvoidance; |
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public RedeliveryPolicy() { |
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} |
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@Override |
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public String toString() { |
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return "RedeliveryPolicy[maximumRedeliveries=" + maximumRedeliveries + "]"; |
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} |
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public RedeliveryPolicy copy() { |
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try { |
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return (RedeliveryPolicy)clone(); |
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} catch (CloneNotSupportedException e) { |
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throw new RuntimeException("Could not clone: " + e, e); |
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} |
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} |
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public boolean shouldRedeliver(int redeliveryCounter) { |
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return redeliveryCounter < getMaximumRedeliveries(); |
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} |
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public RedeliveryPolicy maximumRedeliveries(int maximumRedeliveries) { |
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setMaximumRedeliveries(maximumRedeliveries); |
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return this; |
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} |
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public RedeliveryPolicy initialRedeliveryDelay(long initialRedeliveryDelay) { |
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setInitialRedeliveryDelay(initialRedeliveryDelay); |
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return this; |
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} |
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public RedeliveryPolicy useCollisionAvoidance() { |
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setUseCollisionAvoidance(true); |
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return this; |
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} |
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public RedeliveryPolicy useExponentialBackOff() { |
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setUseExponentialBackOff(true); |
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return this; |
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} |
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public RedeliveryPolicy backOffMultiplier(double multiplier) { |
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useExponentialBackOff(); |
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setBackOffMultiplier(multiplier); |
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return this; |
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} |
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public RedeliveryPolicy collisionAvoidancePercent(double collisionAvoidancePercent) { |
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useCollisionAvoidance(); |
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setCollisionAvoidancePercent(collisionAvoidancePercent); |
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return this; |
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} |
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public double getBackOffMultiplier() { |
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return backOffMultiplier; |
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} |
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public void setBackOffMultiplier(double backOffMultiplier) { |
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this.backOffMultiplier = backOffMultiplier; |
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} |
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public short getCollisionAvoidancePercent() { |
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return (short)Math.round(collisionAvoidanceFactor * 100); |
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} |
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public void setCollisionAvoidancePercent(double collisionAvoidancePercent) { |
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this.collisionAvoidanceFactor = collisionAvoidancePercent * 0.01d; |
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} |
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public double getCollisionAvoidanceFactor() { |
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return collisionAvoidanceFactor; |
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} |
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public void setCollisionAvoidanceFactor(double collisionAvoidanceFactor) { |
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this.collisionAvoidanceFactor = collisionAvoidanceFactor; |
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} |
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public long getInitialRedeliveryDelay() { |
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return initialRedeliveryDelay; |
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} |
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public void setInitialRedeliveryDelay(long initialRedeliveryDelay) { |
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this.initialRedeliveryDelay = initialRedeliveryDelay; |
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} |
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public int getMaximumRedeliveries() { |
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return maximumRedeliveries; |
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} |
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public void setMaximumRedeliveries(int maximumRedeliveries) { |
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this.maximumRedeliveries = maximumRedeliveries; |
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} |
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public long getRedeliveryDelay(long previousDelay) { |
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long redeliveryDelay; |
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if (previousDelay == 0) { |
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redeliveryDelay = initialRedeliveryDelay; |
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} else if (useExponentialBackOff && backOffMultiplier > 1) { |
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redeliveryDelay = Math.round(backOffMultiplier * previousDelay); |
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} else { |
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redeliveryDelay = previousDelay; |
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} |
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if (useCollisionAvoidance) { |
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Random random = getRandomNumberGenerator(); |
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double variance = (random.nextBoolean() ? collisionAvoidanceFactor : -collisionAvoidanceFactor) |
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* random.nextDouble(); |
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redeliveryDelay += redeliveryDelay * variance; |
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} |
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return redeliveryDelay; |
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} |
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public boolean isUseCollisionAvoidance() { |
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return useCollisionAvoidance; |
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} |
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public void setUseCollisionAvoidance(boolean useCollisionAvoidance) { |
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this.useCollisionAvoidance = useCollisionAvoidance; |
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} |
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public boolean isUseExponentialBackOff() { |
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return useExponentialBackOff; |
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} |
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public void setUseExponentialBackOff(boolean useExponentialBackOff) { |
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this.useExponentialBackOff = useExponentialBackOff; |
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} |
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protected static synchronized Random getRandomNumberGenerator() { |
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if (randomNumberGenerator == null) { |
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randomNumberGenerator = new Random(); |
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} |
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return randomNumberGenerator; |
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} |
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} |